JP2000344571A - Porcelain composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a porcelain composition having a dielectric constant whose temperature dependence is controlled in the microwave region. SOLUTION: This porcelain composition comprises forsterite, calcium titanate and spinel in a ratio of their respective molar fractions [forsterite : (calcium titanate) : spinel] such that the point representing the ratio falls within a specific compositional region containing at least two components including forsterite in the ternary system composition diagram with respect to these three components. Also, the temperature coefficient (τ) of the dielectric constant of the composition is -100 to +50 ppm/ deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a porcelain composition having excellent high-frequency characteristics and applicable to high-frequency devices such as electronic communication equipment.

[0002]

2. Description of the Related Art As a porcelain composition having excellent high frequency characteristics,
Forsterite porcelain compositions are known. Forsterite is composed of a reaction product of MgO and SiO ₂ . In such a forsterite, a technique has been developed to reduce the dielectric loss of the forsterite in a high-frequency region by controlling the amount of impurities in the raw material powder and controlling the particle size of the powder (Japanese Patent Application Laid-Open No. H5-205).
262562). In such forsterite, tan δ is in the boundary region of 10 ^-4 to 10 ^-5 .

However, for example, in order to cope with an increase in the amount of information transmission, there is an increasing demand for the development of high-speed communication technology. For high-speed communication, it is desired that the high-frequency device material has a low dielectric constant and a low dielectric loss so as not to delay or attenuate a signal. In addition, there is also a demand for refinement and stabilization of communication frequencies in response to subdivision of communication frequency bands. For this purpose, it is important to reduce the temperature dependence of the dielectric constant.

[0004]

Therefore, in the present invention,
An object of the present invention is to provide a porcelain composition in which the temperature dependence of the dielectric constant is controlled in a microwave region.

[0005]

The present invention examines the low dielectric loss and the temperature dependence of the dielectric constant of other compounds including forsterite, and determines the temperature coefficient of the dielectric constant of forsterite (τ: +116 ppm). To reduce
As a material having a temperature coefficient opposite to that of forsterite, calcium titanate (τ: −1800 ppm) is selected,
By adding this to forsterite and further adding calcium titanate, an increase in dielectric loss caused by adding spinel could be suppressed. That is, in the present invention, the mole fraction of forsterite, calcium titanate, and spinel (forsterite: calcium titanate: spinel) has at least two components including forsterite in the three-component system composition diagram. Frequency (GHz) / dielectric loss (tan)
δ) is not less than 20,000. In the present invention, the mole fraction of forsterite, calcium titanate, and spinel (forsterite: calcium titanate: spinel) is a composition region containing at least two components including forsterite in the ternary composition diagram. Wherein the relative intensity of the diffraction peak appearing in the range of 27 ° to 28 ° with respect to the main diffraction peak of the forsterite crystal is 6% or less.

According to the present invention, the mole fraction of forsterite, calcium titanate, and spinel (forsterite: calcium titanate: spinel) is such that at least two components including forsterite are included in the ternary composition diagram. Provided is a porcelain composition having a temperature coefficient (τ) of a dielectric constant of −100 ppm / ° C. or more and +50 ppm / ° C. or less in a composition region including the same.

Further, the present invention relates to a three-component composition diagram in which the mole fraction of forsterite, calcium titanate and spinel (forsterite: calcium titanate: spinel) is at least one of these three components. Provided is a porcelain composition which is in a composition range including two components and has a frequency (GHz) / dielectric loss (tan δ) of 20,000 or more. The present invention relates to a composition comprising forsterite, calcium titanate, and a spinel mole fraction (forsterite: spinel: calcium titanate) containing at least two of these three components in the composition diagram of these three components. A porcelain composition, wherein the temperature coefficient (τ) of the dielectric constant is in the range of −100 ppm / ° C. or more and +50 ppm / ° C. or less. In the present invention, the mole fraction of forsterite, calcium titanate, and spinel (forsterite: calcium titanate: spinel) is in a composition region including at least two components in the three-component composition diagram. The molar fraction of the component elements in terms of oxide is 30% or more and 61% or less of MgO,
iO ₂ : 0% to 29%, CaO: 3% to 20%
Hereinafter, TiO ₂ : 3% or more and 20% or less, Al ₂ O ₃ : 2%
Provided is a porcelain composition that is at least 45% or less.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The porcelain composition of the present invention is a porcelain composition comprising at least two components of forsterite, spinel and calcium titanate as main components. The porcelain composition of the present invention may contain other substances (compounds) in addition to these main compositions as long as the object of the present invention is not impaired.

The porcelain composition of the present invention can be characterized by the mole fraction of these main components or the oxide equivalent of the component element contained in the main components. The characterization by the main constituent elements is suitable for the characterization of the porcelain composition before firing and the characterization of the porcelain composition in the raw material mixing step. ).

The mole fractions of the three main constituents can be displayed in a ternary composition diagram. Here, the ternary composition diagram means a diagram that is generally used as a method of displaying a composition in a ternary phase diagram. FIG. 1 shows these three-component composition diagrams of the porcelain composition of the present invention. The molar fraction of the above main components in the present porcelain composition is in the range of a composition region containing at least two components in FIG.

In the porcelain composition of the present invention, in this composition range, the porcelain composition of the present invention has a temperature coefficient of dielectric constant (τ).
Is -100 ppm / ° C. or more and +50 ppm / ° C. or less. Preferably, the lower limit is -80 ppm / C or more, more preferably -70 ppm / C or more. Preferably, the upper limit is +40 ppm / ° C. or less. The temperature coefficient of the dielectric constant is measured by a dielectric resonator method. Further, it is preferable that the measurement temperature range is determined within the temperature range in which the dielectric is used. Specifically, 2
It is in the range of 0 ° C to 80 ° C, more specifically in the range of 27 ° C to 80 ° C.

The porcelain composition of the present invention has a frequency (GHz) / dielectric loss (tan δ) in this composition range.
Is not less than 20,000. Here, the frequency (GHz) / dielectric loss (tan δ) is hereinafter also referred to as a Qf value. More preferably, the Qf value is 3
8,000 or more, more preferably 57,000
That is all. The Qf value can be obtained from the dielectric loss and the frequency (GHz) at which the dielectric loss was measured. The porcelain composition of the present invention preferably has a Qf value in the range of 20 GHz to 60 GHz.

Further, more specifically, the porcelain composition of the present invention has a dielectric loss (tan δ) at 23 GHz.
Is 10 × 10 ⁻⁴ or less. More preferably, it is a porcelain composition of 6 × 10 ⁻⁴ or less. More preferably, it is a porcelain composition of 5 × 10 ⁻⁴ or less. The dielectric loss is measured by a dielectric resonator method.

The porcelain composition having the above-mentioned temperature coefficient of dielectric constant and / or dielectric loss preferably contains at least calcium titanate and spinel as main components. For example, the molar fraction of forsterite is 0% or more and 81% or less, and the molar fraction of calcium titanate is 1%.
It is preferably 0% or more and 50% or less, and the molar fraction of spinel is preferably 9% or more and 90% or less. This range of the mole fraction corresponds to the range (A1 + A2) in FIG. More preferably, calcium titanate further comprises 1
0% or more and 40% or less. This range corresponds to the range A2 indicated by the grid in FIG. In the range (A1 + A2) or the range A2, the molar fraction of forsterite is preferably 1% or more, more preferably 5% or more.

In the composition range (A1 + A2), at the same time, the molar fraction (%) of the component element in terms of oxide is Mg
O: 25% to 61%, SiO ₂ : 0% to 29%
Hereinafter, CaO: 3% or more and 25% or less, TiO _2: 3% to 25% or less, Al ₂ O _3: in the range of 2% or more than 45%. A more preferred range A2 is MgO: 30% or more 6
1% or less, SiO ₂ : 0% or more and 29% or less, CaO: 3
% To 20%, TiO ₂ : 3% to 20%, A
l ₂ O ₃ : in the range of 2% to 45%.

When at least forsterite is contained as a main constituent, the forsterite preferably has a molar fraction (%) of more than 0% and not more than 81%;
Preferably, the molar fraction of calcium titanate is more than 10% and less than 50%, and the molar fraction of spinel is in the range of 9% or more and less than 90%. This range corresponds to (A1 +
A2) In the region, the region does not include the mole fraction specified by the point on the side CT-SP. More preferably, the content of calcium titanate is more than 10% and less than 40%. This range does not include the mole fraction defined by the point on the side CT-SP in the A2 region in FIG. In addition,
When forsterite is included as a main component,
In each case, the mole fraction of forsterite was 1%
It is preferably at least 5%, more preferably at least 5%.

At the same time, the range is such that the mole fraction of the component element in terms of oxide is more than 30% to 61% or less for MgO:
O ₂ : more than 0% and 29% or less, CaO: 3% or more and less than 25%, TiO ₂ : 3% or more and less than 25%, Al ₂ O ₃ : 2% or more and less than 45%. A more preferred range is Mg
O30% exceeds 61% or less, SiO _2: 0% over 29% or less, CaO: 3% or more and less than 20%, TiO _2: less than 3% or more 20%, Al ₂ O _3: at 45% or more and 2% or less.

In the case of a porcelain composition containing only calcium titanate and spinel as main components, the molar fraction of calcium titanate: spinel is 10%: 90%.
50% or more is preferably in the range of 50%. In terms of oxide, MgO: 25% or more and 40% or less, SiO
₂ : 0%, CaO: 5% or more and 25% or less, TiO ₂ : 10
% Or more and 25% or less, and Al ₂ O ₃ : preferably 25% or more and 40% or less.

As described above, the porcelain composition of the present invention contains at least two components of forsterite, calcium titanate, and spinel as main constituents, and has a molar fraction in terms of oxides of the constituent elements. MgO: 25
% To 61%, SiO ₂ : 0% to 29%, Ca
O: 3% or more and 25% or less, TiO ₂ : 3% or more and 25% or less, Al ₂ O ₃ : preferably 2% or more and 45% or less, more preferably 30% or more of MgO and 61% or less.
%, SiO ₂ : 0% to 29%, CaO: 3%
Not less than 20%, TiO ₂ : not less than 3% and not more than 20%, Al ₂
O ₃ : in the range of 2% to 45%. In this composition range, a ceramic composition (fired body) having excellent dielectric loss and a controlled temperature coefficient of dielectric constant can be obtained. Specifically, the frequency (GHz) / dielectric loss (tan δ) is 2
A porcelain composition having a porosity of at least 000. Here, the frequency (GHz) / dielectric loss (tan δ) is hereinafter referred to as Qf
Also called a value. More preferably, the Qf value is 38,000
0 or more, more preferably 57,000 or more. More specifically, the dielectric loss at 23 GHz is 10 × 10 ⁻⁴ or less, more preferably 6 × 10 ⁻⁴ or less, and still more preferably 5 × 10 ⁻⁴ or less. Further, the temperature coefficient of the dielectric constant is −100 ppm / ° C. or more and +50.
ppm / ° C. or lower, preferably −80 ppm / ° C. or higher +
40 ppm / ° C or less, more preferably -70 ppm /
+40 ppm / ° C or less.

(Method of Preparing Porcelain Composition) Forsterite has a composition of MgO and SiO _{2 at a} ratio of 2: 1. Spinel has a composition of MgAl ₂ O ₄ . The calcium titanate is CaTiO ₃ .

The method for producing forsterite in the porcelain composition of the present invention is not particularly limited. For example, it is obtained by synthesizing from natural mineral raw materials or oxide-based raw materials, MgO and SiO ₂ . In any of the raw materials, the presence of impurities such as Al ₂ O ₃ , CaO, Fe ₂ O ₃ , and ZrO ₂ is not excluded, but it is preferable that such impurities be controlled. Al ₂ O ₃ is 0.10% or less, C
aO is 0.05% or less, Fe ₂ O ₃ is 0.05% or less, Z
rO is 0.40% or less, and other impurities are 0.1% or less.
It is preferably at most 01%. It is preferable that the type and content of such impurities be controlled in the manufacturing process.

The forsterite powder can be obtained, for example, by a solid phase method. Specifically, MgO powder and SiO ₂ powder are sampled so that the molar ratio becomes 2: 1 and mixed by a ball mill using urethane balls. The mixing is preferably performed for 20 hours or more. Then
The mixture is dried at 100 degrees for 24 hours to obtain a raw material mixture. This mixture was calcined at 1200 ° C. to synthesize forsterite. This forsterite was crushed in distilled water using zirconia balls for 24 hours.
The mixture was dried at 24 ° C. for 24 hours to obtain forsterite powder. A
l ₂ O ₃ 0.10% or less, CaO 0.05% or less, F
Preferably, e ₂ O ₃ is 0.05% or less, ZrO is 0.40% or less, and other impurities are 0.01% or less. The forsterite powder preferably has an average particle size of 3 μm or less. More preferably, 1.5 μm
It is as follows. Further, it is preferable that particles having a particle diameter of 1 μm or less constitute 50% or more of the particles having a particle diameter of 1 μm or less.

In each of the steps of synthesizing forsterite powder by the solid phase method described above, other conventionally known means can be used.

The method for producing calcium titanate and spinel is not particularly limited. Conventionally known various methods for synthesizing calcium titanate and spinel can be used. In addition, it is preferable that the particle diameter in the case of purity or powder is controlled.

Each raw material powder is mixed with a composition that characterizes the present porcelain composition to obtain the present porcelain composition. Preferably, the composition is mixed in the mole fraction of the main components described above. Various additives can be added to the porcelain composition, if necessary, in addition to the main components. When molding and firing, an organic binder or the like is added. In order to obtain a uniform mixture, various conventionally known methods can be used. Freeze drying, natural drying, microwave drying and the like.

The mixture is formed into a desired shape by an appropriate forming means and fired to obtain a sintered ceramic composition. Prior to firing, drying or degreasing treatment for removing a binder or the like is performed. Then, it is sintered. Sintering is performed at an appropriate temperature and time depending on the composition. The preferred sintering temperature is 1100 ° C. to 1600 ° C.
And more preferably 1150 ° C to 1500 ° C.

In the obtained fired body, a ceramic composition (molded body) having excellent dielectric loss and / or a controlled temperature coefficient of dielectric constant can be obtained. Specifically, frequency (GHz)
/ A porcelain composition having a dielectric loss (tan δ) of 20,000 or more. Here, the frequency (GHz) / dielectric loss (tan δ) is hereinafter also referred to as a Qf value. More preferably, the Qf value is 38,000 or more, more preferably, 57,000 or more. More specifically, the dielectric loss at 23 GHz is 10 × 10 ⁻⁴ or less, more preferably 6 × 10 ⁻⁴ or less, and still more preferably 5 × 10 ⁻⁴ or less. Further, the temperature coefficient of the dielectric constant is -100 ppm / ° C or higher and +50 ppm / ° C or lower, preferably -70 ppm / ° C or higher and +40 ppm / ° C or lower.

An X-ray diffraction analysis (C
uKα, characteristic X-ray: 1.54 °), the diffraction angle (2θ) of the ceramic composition containing forsterite and calcium titanate as main components is 27 ° to 2 °.
The diffraction peak of the unknown crystalline substance is observed in the range of 8 °. In particular, as the firing temperature increases, the intensity increases with the decrease in the intensity of the diffraction peak of calcium titanate. In the fired body of the porcelain composition containing spinel as a main component, the tendency of the decrease in the intensity of the diffraction peak of calcium titanate and the increase of the diffraction peak of the unknown crystalline substance is suppressed. In the case of a porcelain composition containing forsterite and calcium titanate as main constituents, the main diffraction peak of the forsterite crystal (35 °-
The relative strength to 37 °) is preferably 6% or less.

As described above, the present invention can also adopt the following embodiments. (1) Among forsterite, calcium titanate, and spinel, at least two components are main components,
A raw material mixture is prepared by mixing the forsterite mole fraction in the range of 0% to 81%, the calcium titanate mole fraction of 10% to 50%, and the spinel mole fraction of 9% to 90%. A method for producing a porcelain composition, comprising firing the raw material mixture. (2) The method for producing a porcelain composition according to (1), wherein a molar fraction of the calcium titanate is 10% or more and 40% or less. (3) Among forsterite, calcium titanate, and spinel, a raw material mixture containing at least forsterite and calcium titanate as main components is prepared and calcined, and the diffraction angle (2θ) in the X-ray diffraction pattern is obtained.
A method for producing a porcelain composition, wherein the relative intensity of the diffraction peak in the range of 27 ° to 28 ° with respect to the main diffraction peak of forsterite is controlled to 6% or less.

[0030]

Embodiments of the present invention will be described below. First, the synthesis of the raw material powder will be described. As spinel, a commercially available product having a purity of 99.9% and a particle size of 0.3 μm was used. 1) Synthesis of forsterite Silicon oxide (SiO ₂ : 99.8% purity, 0.7 μm particle size commercially available) and magnesium oxide (MgO: 99.99% purity, particle size)
0.05 μm commercially available product) was weighed out to a total of 100 g at a molar ratio of 1: 2, placed in a polyethylene bottle having a volume of 1000 ml together with 100 pieces of polyurethane-coated iron cobblestone having a diameter of 10 mm and 220 ml of water, and mixed at 60 RPM for 48 hours. . The slurry thus obtained is passed through a sieve having openings of 100 μm, and then freeze-dried to obtain a dry powder. This dried powder is purified to 99.9 purity.
% Of the alumina porcelain crucible and calcined at 1150 ° C. for 3 hours in an air atmosphere to synthesize forsterite.

2) Synthesis of calcium titanate Calcium carbonate (special grade reagent) and titanium oxide (special grade reagent)
Are weighed to give a total of 100 g at a molar ratio of 1: 1. 100 polyurethane-coated iron cobblestones having a diameter of 10 mm and water 3
Put in a 1000ml polyethylene bottle with 00ml,
Mix at 60 RPM for 48 hours. The thus obtained slurry was passed through a sieve having openings of 100 μm, and then freeze-dried to obtain a dry powder. The dried powder was placed in an alumina porcelain crucible having a purity of 99.9%, and calcined at 1400 ° C. for 3 hours in an air atmosphere to synthesize calcium titanate.

3) Mixing, Forming, and Firing For the three components of forsterite, calcium titanate, and spinel, the raw material mixture was mixed at the mole fractions of the examples, comparative examples, and control examples shown in FIGS. , Freeze-dried to prepare a substrate, molded, fired, obtained porcelain, Examples,
The samples of Comparative Example and Control Example were used. The points corresponding to the mole fractions of the respective examples, comparative examples and control examples are shown in the ternary composition diagram of FIG. The composition points corresponding to the examples are indicated by the numbers of the examples, the composition points corresponding to the comparative examples are indicated by the underlined comparative examples, and the composition points corresponding to the control examples are: This is indicated by the double underlined control number. The dielectric loss tan δ (23) of the obtained porcelain
GHz) and the temperature coefficient of dielectric constant were measured. Further, the Qf value was determined from the value of the dielectric loss. The temperature coefficients of dielectric loss and permittivity are determined by the dielectric resonator method JISR1627-199.
6 was measured. The temperature coefficient of the dielectric constant was set in a constant temperature bath in which the sample was controlled at each predetermined temperature, and the dielectric constant at each temperature (27 ° C., 45 ° C., 63 ° C., 80 ° C.) was measured. (Rate-temperature) was calculated and calculated from this gradient. Further, a powder X-ray diffraction pattern (CuKα, characteristic X-ray: 1.54 °) was obtained for the obtained porcelain.

The mixture of the raw material powders was mixed in a wet ball mill, mixed and dissolved in 1% by weight of polyvinyl alcohol, freeze-dried, and passed through a 150-mesh sieve to obtain a base material.
This raw material mixture is uniaxially molded into a cylindrical body having a diameter of 15 mm and a thickness of 10 mm, and further subjected to isostatic pressing at 3000 kg / cm ² , followed by degreasing at 400 ° C. for 6 hours (atmospheric atmosphere).
Then, it was fired at 1140 ° C. to 1600 ° C. for 2 hours to obtain a sintered body. 2 to 4 show the mole fraction of the main constituent elements, the mole fraction in terms of oxide of each component element, the temperature coefficient of dielectric loss and dielectric constant, the Qf value, and the relative intensity of the unknown crystalline substance peak. Show.

According to these results, in Examples 1 to 21, the temperature coefficient was −90 ppm / ° C. or more and +40 ppm / ° C. or less. In particular, Examples 1 to 14 and Example 1
-70 ppm / ° C or more and +40 ppm in 9 to 21
/ ° C or lower. In Examples 1 to 17,
A temperature coefficient of −90 ppm / ° C. or more and +40 ppm / ° C. or less, and a dielectric loss of 5 × 10 ⁻⁴ or less (Qf value is 46
000 or more). Examples 1 to 1
In No. 4, -70 ppm / ° C. or higher +40 ppm / ° C.
The following temperature coefficient and dielectric loss (Qf value of 46000 or more) of 5 × 10 ⁻⁴ or less could be obtained. In Examples 15 to 17, dielectric loss of 5 × 10 ⁻⁴ or less (Qf value of 46000 or more) and about 80%
A temperature coefficient of ppm / ° C was obtained. Further, in the three-component composition diagram of FIG. 2, Examples 1, 2, 3, 4, 5, 6,
The regions defined and surrounded by 7, 8, 15, 16, 17, 12, 13, and 14 have been found to be preferred composition regions. Examples 1, 2, 3, 4, 9, 1
The regions defined and surrounded by 6,17,12,13 and 14 have also been found to be preferred composition regions.

In Comparative Examples 1 to 5, which are porcelain compositions containing only forsterite and spinel, a low dielectric loss was obtained, but the temperature coefficient was unfavorable. The porcelain composition containing only spinel (Comparative Example 1) and the porcelain composition containing only forsterite (Comparative Example 2)
In each case, good dielectric loss was obtained, but the temperature coefficient was not favorable.

From the results of X-ray diffraction, Examples 1 to 14, 1
In each of 5 to 17 and 19, the relative intensity of the diffraction peak of the unknown crystalline substance having 2θ of 27 ° to 28 ° with respect to the main diffraction peak of the forsterite crystal (2θ of 35 ° to 37 °) was 6% or less. Was. From the above results, by controlling the relative intensity of the diffraction peak of this unknown crystalline substance to the diffraction peak of forsterite to 6% or less, preferably 4% or less, good dielectric loss and temperature coefficient of dielectric constant can be obtained. I knew it could be done.

[0037]

According to the present invention, it is possible to obtain a porcelain composition in which the temperature dependence of the dielectric constant is controlled in the microwave region.

[Brief description of the drawings]

FIG. 1 is a diagram showing a ternary composition diagram of forsterite (MS), calcium titanate (CT), and spinel (SP).

FIG. 2 shows forsterite (MS) in the porcelain compositions of Examples 1 to 21, Comparative Examples 1 to 6, Control Examples 1 and 2,
FIG. 3 is a ternary composition diagram illustrating the molar fraction of calcium titanate (CT) and spinel (SP).

FIG. 3 shows molar fractions, oxide-converted molar fractions, temperature coefficients of dielectric constants, dielectric losses, Qf values, and relative intensities (%) of unknown crystalline substance peaks in the porcelain compositions of Examples 1 to 21.
FIG.

FIG. 4 shows the molar fraction of the porcelain compositions of Comparative Examples 1 to 6,
Oxide-equivalent mole fraction, temperature coefficient of dielectric constant, dielectric loss,
It is a figure which showed Qf value and the relative intensity (%) of an unknown crystalline substance peak.

FIG. 5 shows molar fractions, oxide-converted molar fractions, temperature coefficients of dielectric constants, dielectric losses, Qf values, and relative intensities (%) of unknown crystalline substance peaks in the porcelain compositions of Comparative Examples 1 and 2.
FIG.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01G 4/12 310 C04B 35/20 H01P 7/10 35/46 Z (72) Inventor Yutaka Toda Nagoya, Aichi 2-4-1 Rokuno, Atsuta-ku, Japan Fine Ceramics Center (72) Inventor Noriyoshi Shibata 2-4-1, Rokuno, Atsuta-ku, Nagoya-shi, Aichi Japan Fine Ceramics Center (72) Inventor Tsutomu Tsunooka 4-4-1 Rokuno 2-chome, Atsuta-ku, Nagoya-shi, Aichi Japan Fine Ceramics Center F-term (reference) 4G030 AA07 AA08 AA16 AA36 AA37 BA09 CA01 GA04 GA08 GA22 GA27 4G031 AA03 AA04 AA11 AA29 AA30 BA09 CA01 GA02 GA06 GA11 5E001 AE00 AE00AE03 AE04 AH05 AH09 AJ02 5G303 AA02 AA10 AB06 AB08 AB11 BA12 CA01 CB01 CB06 CB17 CB30 CB35 5J006 HC07

Claims (6)

[Claims] 1. A composition comprising at least two components including forsterite in a ternary composition diagram of the forsterite, calcium titanate, and spinel mole fraction (forsterite: calcium titanate: spinel). Frequency (GHz) / dielectric loss (t
and δ) is 20,000 or more. 2. A composition containing at least two components including forsterite in the ternary composition diagram of the forsterite, calcium titanate, and spinel mole fraction (forsterite: calcium titanate: spinel). X that is in the range and appears in the range of 27 ° to 28 °
A porcelain composition, wherein a relative intensity of a line diffraction peak to a main diffraction peak of a forsterite crystal is 6% or less. 3. A composition containing at least two components including forsterite in the three-component composition diagram, wherein the molar fraction of forsterite, calcium titanate, and spinel (forsterite: calcium titanate: spinel) is shown. And the temperature coefficient (τ) of the dielectric constant is -10
A porcelain composition having a content of 0 ppm / ° C or more and +50 ppm / ° C or less. 4. The mole fraction of forsterite, calcium titanate and spinel (forsterite: calcium titanate: spinel) contains at least two of these three components in the composition diagram of these three components. Frequency (GHz) / dielectric loss (tan)
porcelain composition wherein δ) is 20,000 or more. 5. The mole fraction of forsterite, calcium titanate and spinel (forsterite: spinel: calcium titanate) contains at least two of these three components in the composition diagram of these three components. In the composition region, the temperature coefficient (τ) of the dielectric constant is −100.
A porcelain composition which is not less than ppm / ° C and not more than +50 ppm / ° C. 6. Forsterite and calcium titanate
And the mole fraction of spinel (forsterite: titanic acid
Calcium: Spinel)
In the composition region containing at least two components,
The molar fraction of the element in terms of oxide is 30% or more of MgO
61% or less, SiO_Two: 0% or more and 29% or less, CaO:
3% or more and 20% or less, TiO_Two: 3% or more and 20% or less,
Al_TwoO _Three: 2% or more and 45% or less of a porcelain composition.