JPS59149603A - Temperature compensating porcelain dielectric material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Invention i; i'-La2 T, l 207 , O20
Nb207 Mg2x゛2 'I' i 2-2X 04~2X (f Kotashi O〈
x < 1.0).

The present invention has a large dielectric constant, small dielectric loss,
Furthermore, the present invention provides a temperature-compensating porcelain dielectric material in which the temperature coefficient of dielectric constant can be freely changed over a wide range, and the value of the temperature coefficient does not change over a wide temperature range.

Temperature-compensating porcelain capacitors are often used as circuit elements in communication equipment, color televisions, etc. 1 In this case, it is always desired that the dielectric constant be large and the dielectric loss be small, and the temperature coefficient should be within the specified range. It is desired to maintain a constant value with respect to temperature.

Up to this point, 5rTiOs is used as a phase distinction of this kind.

0aTi03. MgTiO3. , Furthermore, the temperature dependence of the IIA degree coefficient, that is, the change in the temperature coefficient due to temperature O, is also ±60 p.
pm/''C or higher.Also, in the case of a dielectric constant having a large temperature coefficient, the temperature coefficient changes greatly with respect to the temperature ζ.

Therefore, La20 is one of the materials that compensates for these drawbacks.
3-'I' io, -MgO-based materials were first developed (
JP-A-49-1.2400). With this yarn, we succeeded in reducing the 11-circle coefficient to almost zero, and the temperature dependence of the coefficient is 4-! I! The degree of improvement has been improved. (However, it was impossible to adjust the temperature coefficient depending on the purpose.

The present invention improves these drawbacks, namely La2 Ti207. Oa2 Nb207, 2Mg
2x'l'1z-2XQ 42x (r, = 0〈x
The porcelain lightning arrester of the thread shown in <1.0) has a high dielectric constant and low dielectric loss due to the fineness of synthesizing the materials, and the strength can be changed by changing the IIA degree coefficient of the dielectric constant over a wide range. 7.1: The value of the temperature coefficient of dielectric constant is constant in the temperature range 7.1. Also, we have found that the value of the temperature coefficient of permittivity is constant in the temperature range. Firing temperature 5
Relatively low temperature and easy to manufacture 15 sets IJSt! i2/J
It was also found that

Hereinafter, the effectiveness of misfire 1-4 will be explained based on cusp 77 (II%l).

Example La2 ']' i 207 , Ija2 N1) 2
07 , -2Mgzxi' i 2-2XO11-2X
(0<x<1., O) for porcelain dielectric materials having a structure of La2 o3. 'rio, ,0aOO3,
Nb, 0. , Mg<) powder IHLa2 T
i2o, , sua, Nb20. , -1Mg2XT i
2-2XO4-2X (X = 0) Te”rN
b'7cctl Ru iR3 invitation! .

Regarding materials 61 La20. , T i02.0a
OO8, Nb20° powder was weighed according to each composition, mixed in a ball mill, filtered, dried, and heated to 1000°C.
~12 (prebaked at 10°C for 2 hours. Then, pressed and shaped into a disc with a diameter of 1.6 Wr!n,
Firing was carried out at 1450° C. for 1 to 2 hours. Silver electrodes were baked on both sides of the resulting porcelain at 600°C, and then dielectric properties were measured under fire conditions. The dielectric constant and dielectric loss were measured at the frequency name temperature of the first group z, and were determined using the dielectric constant value at 20° C. as a reference.

Here, the temperature coefficient was calculated according to the following formula.

ε20 (T-20) However, TKε: Temperature coefficient (pp temperature °C) εT: T
Dielectric constant value ε20 at 20°C: Dielectric constant value T-71 Kawasada Kiyoshi 1 Masaru Of the obtained results, 71 representative examples are listed in Table 1.

In addition, in the temperature coefficient column of Table 1, each I! from -30°C to 85°C is indicated by . This shows that the temperature coefficient at A111 is within the range of 10.

Below margin 781 table side light L-drsf, X, side La21'
I, 07°Oa2 Nb207 YuMgzxTi
A porcelain dielectric material composed of 2-2X04-2X (O<x<1.0)°2 exhibits excellent characteristics such as a high dielectric constant and low dielectric loss. By adjusting the composition ratio, the temperature coefficient can be adjusted to approximately +128pp.
It is clear that the temperature can be adjusted over a very wide range from m/1 to -470 ppm/°C.Moreover, the change in the temperature IFf-coefficient with respect to temperature is also very small: (Oppm/
Temperature coefficient within +1 (within 1%).

10,000, L a2 'J,' + 1 and 6y range where 207 is less than 5 mol% and composition range (La2Tj20y is 0 than 95 mol shadow) and -1-Mg zx'L'
i 2-2XO4-2X (04x (1,+1')
composition with 800 mol% more; in the 1r1χ range, the change of 1: of the 11 degree coefficient to black 2 is +10 p prrl
/℃I] or within +1()% of humidity 1 dust coefficient ♂
At the same time, the condition that the dielectric constant value is 30 or more is added by 1 ura fS.

From this point δ, the range of the second half of the present invention is limited to the following non-eleven range.

La2Tj20y, 0a2Nb207, -. 2
Mg 2x'l'i 2-2XO4-2X (0<x〈
1.0) in the ternary yarn α[La2T 1207]
・β(('3a2Nb207)r(+Mg2x'l"1
z-2XO,, -2X] (1 value α + β + γ = 1), the values of α, β, and γ are each 0.05. ＜α
<1. ．． 0.0<β<0.95.

A porcelain dielectric material for temperature compensation, characterized in that it has a composition that satisfies 0<γ<08.

Claims (1)

[Claims] L a2 'l' 1207 + Oa2Nb207
'N1g 2X 'l l 22x04+2 -2X ((lax〈1.0) ternary component yarn a
(La2'I' i20?) ・β[0a2Nb2
07]・7- [-2Mg 2X'I" i 2-2
XO4-2X , :l (f Kodashi α-1-β+γ=
1.0), the values of α, β, and γ are each 0.
．． 05 <α<1.0.0<β<0.95.0<γ<0
．． A material for temperature compensation, characterized by having a composition that is made within a range of 8.