JP2872438B2 - Dielectric porcelain composition - Google Patents
Dielectric porcelain compositionInfo
- Publication number
- JP2872438B2 JP2872438B2 JP3102239A JP10223991A JP2872438B2 JP 2872438 B2 JP2872438 B2 JP 2872438B2 JP 3102239 A JP3102239 A JP 3102239A JP 10223991 A JP10223991 A JP 10223991A JP 2872438 B2 JP2872438 B2 JP 2872438B2
- Authority
- JP
- Japan
- Prior art keywords
- dielectric
- present
- ceramic composition
- composition
- dielectric ceramic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、誘電体共振器材料とし
て好適なバリウム、チタン、サマリウム及び酸素からな
る誘電体磁器組成物に関するものである。本発明の誘電
体磁器組成物は、誘電体共振器材料のほかに、例えばマ
イクロ波IC用基板、誘電体調整捧等にも利用できる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric ceramic composition composed of barium, titanium, samarium and oxygen, which is suitable as a dielectric resonator material. The dielectric ceramic composition of the present invention can be used for, for example, a substrate for a microwave IC, a dielectric adjustment material, and the like, in addition to the dielectric resonator material.
【0002】[0002]
【従来技術及びその問題点】近年、マイクロ波回路の集
積化に伴い、小型で高性能の誘電体共振器が求められて
いる。このような誘電体共振器に使用される誘電体磁器
組成物には、比誘電率εrが大きいこと、また、共振周
波数の温度係数τfの安定度及び共振周波数の温度特性
の直線性が優れ、無負荷Qが大きいこと等の特性が要求
されている。2. Description of the Related Art In recent years, with the integration of microwave circuits, a small and high-performance dielectric resonator has been demanded. The dielectric ceramic composition used for such a dielectric resonator has a large relative permittivity ε r , a stability of the temperature coefficient τ f of the resonance frequency, and a linearity of the temperature characteristic of the resonance frequency. There are demands for excellent characteristics such as high unloaded Q.
【0003】このような誘電体磁器組成物として従来、
TiO2、BaO−TiO2等を主成分とするものが知
られているが、温度係数が大きかったり、マイクロ波帯
域での誘電損失が大きかったりして実用化するには困難
な面がある。また、BaO−TiO2−Sm2O3系の
誘電体磁器組成物についての提案(特公昭59−375
26号公報)もあるが、十分に大きいQ値は得られてい
ない。Conventionally, such a dielectric porcelain composition has been
Although those containing TiO 2 , BaO—TiO 2 or the like as a main component are known, there are aspects that are difficult to put into practical use due to a large temperature coefficient and a large dielectric loss in a microwave band. Further, proposals for BaO-TiO 2 -Sm 2 O 3 based dielectric ceramic composition (JP-B 59-375
No. 26), but a sufficiently large Q value has not been obtained.
【0004】更に、Ba(Mg1/3Ta2/3)O3
系、Ba(Zn1/3Ta2/3)O3系、Ba(Zn
1/3Nb2/3)O3系等のペロブスカイト型構造を
有する誘電体磁器組成物も知られているが、これらは比
誘電率が小さいために、例えば0.1〜4GHz帯では
共振器が大きくなりすぎるという難点がある。Further, Ba (Mg 1/3 Ta 2/3 ) O 3
System, Ba (Zn 1/3 Ta 2/3 ) O 3 system, Ba (Zn
Dielectric porcelain compositions having a perovskite structure, such as 1/3 Nb 2/3 ) O 3, are also known. Is too large.
【0005】[0005]
【発明の目的】本発明の目的は、誘電体共振器材料、特
に0.1〜4GHz帯で使用される誘電体共振器材料と
して好適な誘電体磁器組成物を提供することにある。ま
た、本発明の目的は、高誘電率で、Qが大きく、τfの
安定性がよい誘電体磁器組成物を提供することにある。An object of the present invention is to provide a dielectric ceramic composition suitable as a dielectric resonator material, particularly a dielectric resonator material used in the 0.1 to 4 GHz band. Another object of the present invention is to provide a dielectric ceramic composition having a high dielectric constant, a large Q, and a good stability of τ f .
【0006】[0006]
【課題を解決するための手段】本発明者らは、誘電体磁
器組成物に使用されている多数の成分元素の中で、バリ
ウム、チタン、サマリウム及び酸素の組合せからなる特
定の磁器組成物によって前記目的を達成できることを知
見した。本発明は、組成式 xBaO・yTiO2・z
Sm2O3(式中、0.15≦x≦0.25、0.725
<y≦0.85、0<z≦0.018で、x+y+z=
1である。)で表されるバリウム、チタン、サマリウム
及び酸素からなる誘電体磁器組成物に関するものであ
る。SUMMARY OF THE INVENTION The present inventors have developed, among a number of component elements used in a dielectric porcelain composition, a specific porcelain composition comprising a combination of barium, titanium, samarium and oxygen. It has been found that the above object can be achieved. The present invention relates to the composition formula xBaO.yTiO 2 .z
Sm 2 O 3 (wherein, 0.15 ≦ x ≦ 0.25, 0.725
<Y ≦ 0.85, 0 <z ≦ 0.018, x + y + z =
It is one. The present invention relates to a dielectric porcelain composition comprising barium, titanium, samarium and oxygen represented by the following formula:
【0007】本発明の誘電体磁器組成物は、比誘電率が
大きいために、共振器の小型化が図れ、無負荷Qも大き
くなる。更に、共振周波数の温度係数τfが小さい。本
発明において、BaOのモル分率が0.25よりも大き
い、あるいはTiO2のモル分率が0.725より小さ
いと、共振周波数の温度係数τfが大きくなるので、B
aO、TiO2のモル分率は上記範囲に限定される。ま
た、Sm2O3のモル分率が0.018よりも大きいと無
負荷Qが小さくなるのでSm2O3のモル分率は上記範囲
に限定される。本発明によれば、酸化サマリウムの含有
量が少ないため、低コストで製造できる。Since the dielectric ceramic composition of the present invention has a large relative dielectric constant, the resonator can be miniaturized, and the unloaded Q also increases. Further, the temperature coefficient τ f of the resonance frequency is small. In the present invention, when the mole fraction of BaO is larger than 0.25 or the mole fraction of TiO 2 is smaller than 0.725, the temperature coefficient τ f of the resonance frequency increases,
The molar fractions of aO and TiO 2 are limited to the above range. When the mole fraction of Sm 2 O 3 is larger than 0.018, the no-load Q becomes small, so the mole fraction of Sm 2 O 3 is limited to the above range. According to the present invention, since the content of samarium oxide is small, it can be manufactured at low cost.
【0008】本発明の誘電体磁器組成物の好適な製造法
の一例を次に説明する。炭酸バリウム、酸化チタン、酸
化サマリウムの出発原料を各所定量ずつ、水、アルコー
ル等の溶媒と共に湿式混合する。続いて、水、アルコー
ル等を除去した後、粉砕し、酸素含有ガス雰囲気(例え
ば空気雰囲気)下に900〜1100℃で約2時間程度
仮焼する。これによって形成された仮焼物を粉砕し、ポ
リビニルアルコールの如き有機バインダと共に混合して
均質にし、乾燥、粉砕して、加圧成型(圧力100〜1
000kg/cm2)する。そして、この成型物を空気
の如き酸素含有ガス雰囲気下に1200〜1400℃で
焼成すれば、上記組成式で表される誘電体磁器組成物が
得られる。An example of a preferred method for producing the dielectric ceramic composition of the present invention will be described below. The starting materials of barium carbonate, titanium oxide, and samarium oxide are wet-mixed in predetermined amounts with a solvent such as water or alcohol. Subsequently, after removing water, alcohol and the like, the mixture is pulverized and calcined in an oxygen-containing gas atmosphere (for example, an air atmosphere) at 900 to 1100 ° C. for about 2 hours. The calcined product thus formed is pulverized, mixed with an organic binder such as polyvinyl alcohol to homogenize, dried, pulverized, and pressure-molded (pressure 100 to 1).
000 kg / cm 2 ). Then, when this molded product is fired at 1200 to 1400 ° C. in an oxygen-containing gas atmosphere such as air, the dielectric ceramic composition represented by the above composition formula is obtained.
【0009】こうして得られた誘電体磁器組成物は、そ
のまま、または必要に応じて、適当な形状及びサイズに
加工することで、誘電体共振器、マイクロ波IC用誘電
体基板、誘電体調整棒等の材料として使用することがで
き、特に0.1〜4GHz帯で使用される誘電体共振器
としたときに優れた効果が奏される。The dielectric ceramic composition thus obtained can be processed as it is or as needed in an appropriate shape and size to obtain a dielectric resonator, a dielectric substrate for microwave IC, a dielectric adjustment rod. And the like. Particularly, when a dielectric resonator used in the 0.1 to 4 GHz band is used, an excellent effect is obtained.
【0010】なお、バリウム、チタン、サマリウムの原
料としては、BaCO3、BaO、TiO2、Sm2O
3等の他に、焼成時に酸化物となる炭酸塩、水酸化物等
を使用することができる。The raw materials of barium, titanium, and samarium include BaCO 3 , BaO, TiO 2 , Sm 2 O
In addition to 3, etc., carbonates, hydroxides, and the like that become oxides during firing can be used.
【0011】[0011]
【実施例】以下に実施例を示し、本発明をさらに具体的
に説明する。 実施例1 炭酸バリウム(BaCO3)粉末0.205モル、酸化
チタン(TiO2)粉末0.78モル、酸化サマリウム
(Sm2O3)粉末0.015モルをエタノールと共に
ボールミルに入れ、12時間湿式混合した。この混合物
をボールミルから取り出して溶媒のエタノールを蒸発さ
せ、らい潰機で1時間粉砕した。粉砕物は空気雰囲気下
に950℃で仮焼した後、再びらい潰機で1時間粉砕
し、0.205BaO・0.78TiO2・0.015
Sm2O3の組成からなる仮焼粉を得た。The present invention will be described more specifically with reference to the following examples. Example 1 0.205 mol of barium carbonate (BaCO 3 ) powder, 0.78 mol of titanium oxide (TiO 2 ) powder, and 0.015 mol of samarium oxide (Sm 2 O 3 ) powder were put into a ball mill together with ethanol, and wet-processed for 12 hours. Mixed. The mixture was taken out of the ball mill, the ethanol of the solvent was evaporated, and the mixture was pulverized for 1 hour using a crusher. The pulverized material was calcined at 950 ° C. in an air atmosphere and then pulverized again with a crusher for one hour to obtain 0.205 BaO.0.78 TiO 2 .0.015.
A calcined powder having a composition of Sm 2 O 3 was obtained.
【0012】次いで、この仮焼粉に適量のポリビニルア
ルコール溶液を加えて均一に混合した後、直径15mm
φ、厚さ5.5mmのペレットに成型して空気雰囲気下
に1250℃で2時間焼成、焼結して本発明の誘電体磁
器組成物を得た。こうして得られた磁器組成物を適当な
大きさにカットした後、誘電共振法によって測定し、共
振周波数f0(2〜6GHz)における無負荷Q及び比
誘電率εrを求めた。また、共振周波数の温度依存性に
ついては、−40〜50℃の範囲で測定し、温度係数τ
fを求めた。その結果を表1に示す。Next, an appropriate amount of a polyvinyl alcohol solution was added to the calcined powder and mixed uniformly.
A pellet having a diameter of 5.5 mm and a thickness of 5.5 mm was formed, fired and sintered at 1250 ° C. for 2 hours in an air atmosphere to obtain a dielectric ceramic composition of the present invention. After the thus obtained porcelain composition was cut into an appropriate size, it was measured by the dielectric resonance method, and the unloaded Q and the relative permittivity ε r at the resonance frequency f 0 (2 to 6 GHz) were obtained. The temperature dependence of the resonance frequency was measured in the range of -40 to 50 ° C, and the temperature coefficient τ
f was determined. Table 1 shows the results.
【0013】実施例2〜9 実施例1の炭酸バリウム、酸化チタン、酸化サマリウム
の混合割合を表1記載のように代えた他は、実施例1と
同様にして誘電体磁器組成物を製造し、実施例1と同様
に特性を測定した。その結果を表1に示す。表において
*印を付したものは、本発明の範囲外の比較例である。Examples 2 to 9 A dielectric ceramic composition was manufactured in the same manner as in Example 1 except that the mixing ratio of barium carbonate, titanium oxide and samarium oxide was changed as shown in Table 1. The characteristics were measured in the same manner as in Example 1. Table 1 shows the results. Those marked with * in the table are comparative examples outside the scope of the present invention.
【0014】[0014]
【表1】 [Table 1]
【0015】[0015]
【発明の効果】本発明によれば、高誘電率で、Qが大き
く、τfの安定性がよい誘電体磁器組成物が得られる。According to the present invention, a dielectric ceramic composition having a high dielectric constant, a large Q, and a good stability of τ f can be obtained.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−173408(JP,A) ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-173408 (JP, A)
Claims (1)
3(式中、0.15≦x≦0.25、0.725<y≦
0.85、0<z≦0.018で、x+y+z=1であ
る。)で表されるバリウム、チタン、サマリウム及び酸
素からなる誘電体磁器組成物。1. A composition formula xBaO · yTiO 2 · zSm 2 O
3 (where, 0.15 ≦ x ≦ 0.25, 0.725 <y ≦
0.85, 0 <z ≦ 0.018 , and x + y + z = 1. A) a dielectric ceramic composition comprising barium, titanium, samarium and oxygen.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3102239A JP2872438B2 (en) | 1991-02-08 | 1991-02-08 | Dielectric porcelain composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3102239A JP2872438B2 (en) | 1991-02-08 | 1991-02-08 | Dielectric porcelain composition |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06111624A JPH06111624A (en) | 1994-04-22 |
JP2872438B2 true JP2872438B2 (en) | 1999-03-17 |
Family
ID=14322084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3102239A Expired - Fee Related JP2872438B2 (en) | 1991-02-08 | 1991-02-08 | Dielectric porcelain composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2872438B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3840869B2 (en) * | 1999-10-28 | 2006-11-01 | 株式会社村田製作所 | High frequency dielectric ceramic composition, dielectric resonator, dielectric filter, dielectric duplexer, and communication device |
-
1991
- 1991-02-08 JP JP3102239A patent/JP2872438B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH06111624A (en) | 1994-04-22 |
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