JPH0280366A - Dielectric porcelain composition - Google Patents
Dielectric porcelain compositionInfo
- Publication number
- JPH0280366A JPH0280366A JP63230832A JP23083288A JPH0280366A JP H0280366 A JPH0280366 A JP H0280366A JP 63230832 A JP63230832 A JP 63230832A JP 23083288 A JP23083288 A JP 23083288A JP H0280366 A JPH0280366 A JP H0280366A
- Authority
- JP
- Japan
- Prior art keywords
- value
- compsn
- bao
- nd2o3
- bi2o3
- 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.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims description 16
- 229910052573 porcelain Inorganic materials 0.000 title abstract description 4
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium oxide Inorganic materials [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims abstract description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 claims abstract description 7
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims abstract 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 2
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 2
- 229910001938 gadolinium oxide Inorganic materials 0.000 claims description 2
- 229940075613 gadolinium oxide Drugs 0.000 claims description 2
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 abstract 6
- 239000000919 ceramic Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VKJLWXGJGDEGSO-UHFFFAOYSA-N barium(2+);oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[O-2].[Ti+4].[Ba+2] VKJLWXGJGDEGSO-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
Description
【発明の詳細な説明】
イ９発明の目的
産 土の１
本発明は通信及び放送機器に使用されるマイクロ波用誘
電体磁器組成物に関する。DETAILED DESCRIPTION OF THE INVENTION A.9 OBJECTS OF THE INVENTION Field 1. The present invention relates to a microwave dielectric ceramic composition used in communication and broadcasting equipment.
」」１１
近年マイクロ波帯において、比誘電率（ε、）が大きく
、誘電損失（Ｄ＝１／Ｑ）が小さく、また共振周波数の
温度係数（τＣ）が小さな誘電体が共振器に用いられ、
衛星放送受信機や自動車電話などの通信及び放送機器に
応用されている。従来このような用途には、ＢａＯ−Ｔ
ｉＯ２系、ＭｇＯ−ＣａＯ−ＴｉＯ２系の誘電体磁器が
知られている。11 In recent years, in the microwave band, dielectric materials with large relative permittivity (ε, ), small dielectric loss (D=1/Q), and small temperature coefficient of resonance frequency (τC) have been used for resonators. ,
It is applied to communication and broadcast equipment such as satellite broadcast receivers and car phones. Conventionally, for such applications, BaO-T
Dielectric ceramics based on iO2 and MgO-CaO-TiO2 are known.
が解′ しようと る 題
誘電体を共振器として使用する際、共振器の寸法は、ε
、−１／２に比例することから誘電率の大きい誘電体は
ど小型化が可能である。上記ＢａＯ−ＴｉＯ２系、Ｍｇ
Ｏ−ＣａＯ−ＴｉＯ２系ではε、＝２０〜４ｏであって
、マイクロ波帯でも周波数の低い１ＧＨｚ付近でこれら
を共振器として使用する際には寸法が大きくなる欠点が
ある。 ｌＧ１１ｚ付近で使用される誘電体共振器の
需要が近年高まりつつあり１寸法の小型化の満たすため
に、より大きな誘電率を持つ誘電体磁器が必要となる。When using a dielectric as a resonator, the dimensions of the resonator are ε
, -1/2, it is possible to downsize a dielectric material with a large dielectric constant. The above BaO-TiO2 system, Mg
In the O-CaO-TiO2 system, ε=20 to 4o, and when they are used as a resonator at around 1 GHz, which is a low frequency even in the microwave band, there is a drawback that the dimensions become large. Demand for dielectric resonators used in the vicinity of lG11z has been increasing in recent years, and dielectric ceramics with a larger dielectric constant are required to meet the demand for one-dimensional miniaturization.
共振器としての特性を満たすためには、大きな誘電率を
持つのみでなく、Ｑが高く。In order to satisfy the characteristics as a resonator, it must not only have a large dielectric constant but also a high Q.
τＣが小さなことが必要である０例えば特開昭５６１３
４５６２号に示されるＢａＯ−Ｔｉ０２−Ｎｄ２Ｏ３系
に於いては、ε、 ＞７０．０ ＞２，０００とε、が
大きく、Ｑが高い磁器が得られるが、τＣが１５０ｐｐ
ｍ／”Ｃ以上と大きく実用には適さない、また特公昭５
９−５１０９１号に示されるＢＢａＯ−Ｔｉ０２−Ｎｄ
２０３−Ｂｉ２０系に於いてはε１．Ｑ共に大きな値が
得られているがτｆが５０〜１１００ｐｐ／ ’Ｃと太
き（Ｂｉ２０ｇの効果のみでは充分なで、を得るのは難
しい。It is necessary that τC be small. For example, JP-A No. 5613
In the BaO-Ti02-Nd2O3 system shown in No. 4562, a porcelain with a large ε of >70.0 >2,000 and a high Q can be obtained, but with a τC of 150 ppp.
m/”C or more, it is not suitable for practical use, and
BBaO-Ti02-Nd shown in No. 9-51091
In the 203-Bi20 series, ε1. Although large values of Q are obtained, τf is large at 50 to 1100 pp/'C (the effect of 20 g of Bi alone is sufficient, so it is difficult to obtain τf).
口１発明の構成
課題を解゛するための
本発明は上記の欠点を改善するため、誘電率が大きく、
Ｑが高く、τｒの小さい誘電体磁器組成物を提供するた
めなされたもので、＊化バリウム酸化チタン、酸化ネオ
ジム、酸化ガドリウム、酸化ビスマスからなる成分組成
式（以下すべてモル比率で示す）を
ａ−ＢａＯ−ｂ−Ｔｉ０２−ｃ （（１−Ｘ−ｙ）Ｎｄ
２０３−ｘＧｄ２０３−ｙＢｉ２０３ ）と表わしたと
き
ａ＋ｂ＋ｃ＝１． ０．０５＜ａ ＜０．２５．０．６
０＜ｂ ＜０．８０゜０．０５＜ ｃ ＜ ０．２５．
でかつ０＜ｘ≦０．２０．０ ＜ｙ≦０．２５の範囲に
あることを特徴とする誘電体磁器組成物である。The present invention for solving the structural problems of the first invention improves the above-mentioned drawbacks by using a material having a large dielectric constant,
It was developed to provide a dielectric ceramic composition with a high Q and a small τr, and the compositional formula (hereinafter all shown in molar ratio) consisting of barium titanium oxide, neodymium oxide, gadolinium oxide, and bismuth oxide is a -BaO-b-Ti02-c ((1-X-y)Nd
203-xGd203-yBi203), a+b+c=1. 0.05<a<0.25.0.6
0<b<0.80゜0.05<c<0.25.
The dielectric ceramic composition is characterized in that it is in the range of 0<x≦0.20.0 <y≦0.25.
組成範囲の限定理由は次の通りである。The reason for limiting the composition range is as follows.
ａはＢａＯが０．０５以下ではε、が小さく 、 ０．
２５以上ではＱが低くなってしまう。When BaO is 0.05 or less, ε is small and 0.
If it is 25 or more, the Q will be low.
ｂはＴｉＯ□が０４６０以下では焼結し難くなり、ｏ、
ｇｏ以上ではτｆが大きくなり過ぎる。b becomes difficult to sinter when TiO□ is less than 0460, o,
If it is more than go, τf becomes too large.
Ｃは、Ｎｄ２Ｏ３，Ｇｄ２Ｏ３，Ｂｉ２Ｏ３の総和を示
すが（Ｒ２Ｏ３で示す）、０．０５以下ではε１が小さ
く 、０．２５以上ではε７．Ｑ共に小さくなる。C represents the sum of Nd2O3, Gd2O3, and Bi2O3 (represented by R2O3); if it is 0.05 or less, ε1 is small, and if it is 0.25 or more, ε7. Both Q become smaller.
Ｇｄ２Ｏ３の係数のＸは、０．２０を越すと、Ｑが低く
なりまた旧２０３の係数ｙは０．２５を超えるとＱが低
くなる。When the coefficient X of Gd2O3 exceeds 0.20, the Q becomes low, and when the coefficient y of the old 203 exceeds 0.25, the Q becomes low.
本発明は、Ｎｄ２Ｏ３の一部をＧｄ２Ｏ，とＢ ｉ ２
０３で直換することにより、従来得られなかったε、≧
６００≧１０００（３ＧＨｚの場合）、かつτｆ≦６０
ｐ ｐ ｍ ／ ’Ｃの値を満足する上述の極めて限
定された領域を見出したものである。In the present invention, a part of Nd2O3 is converted into Gd2O, and B i 2
By direct conversion with 03, ε, ≧, which could not be obtained conventionally.
600≧1000 (in case of 3GHz), and τf≦60
We have found the above-mentioned extremely limited region that satisfies the value of p p m /'C.
以下、実施例により更に詳細に説明する。Hereinafter, it will be explained in more detail with reference to Examples.
１１几
出発原料に高純度のＢａＣＯ３，ＴｉＯ２，Ｎｄ２Ｏ３
，Ｇｄ２０３Ｂ ｉ ２０ｇを用いて所定の組成比にな
るように秤量した後、ポリエチレンポット、アルミナボ
ールを用いて純水と共に湿式混合した。得られたスラリ
ーを吸引濾過し乾燥した。これを空気中で９００〜１１
００℃で１〜６時間仮焼した。仮焼後再びポリエチレン
ボ７ト、アルミナボールを用いて、純水と共に湿式粉砕
し、吸引濾過、乾燥した。これにバインダーを添加し、
４８メツシユを通して造粒した。圧力１００１００Ｏ／
ａ＋！で直径的１２ｍｍ 、厚さ約６ｍｍにプレス成形
した後、白金板上で１３００〜１４５０℃で焼成した。11 liters High purity BaCO3, TiO2, Nd2O3 as starting materials
, Gd203B i 20g were weighed to obtain a predetermined composition ratio, and then wet mixed with pure water using a polyethylene pot and an alumina ball. The resulting slurry was suction filtered and dried. 900-11 in air
Calcining was performed at 00°C for 1 to 6 hours. After calcining, the mixture was wet-pulverized with pure water again using a polyethylene bottle and an alumina ball, followed by suction filtration and drying. Add a binder to this,
It was granulated through 48 mesh. Pressure 100100O/
a+! After press-forming to a diameter of 12 mm and a thickness of about 6 mm, the molded material was fired at 1300 to 1450°C on a platinum plate.
得られた誘電体磁器について、 ３ＧＨｚにおける比誘
電率ε、Ｑ及び−２５〜＋７５℃における共振周波数の
温度係数τｒを測定した。測定周波数による特性の差は
Ｑのみであり、Ｑは周波数に反比例すると見なせる。即
ちＩＧＨｚでのＱ値は３ＧＨｚの３倍の値となる。その
結果を第１表に組成Ｎｏ、の実施例１〜２２と比較例２
３〜２８で示した。また第１図にＢａＯ−Ｔｉ０２−Ｒ
２Ｏ３系の３元系で９本発明の組成範囲は六角枠内（た
だし、線上は範囲外）で、又第１図内の数字は組成Ｎｏ
、を示す、ただし、 Ｎｏ、３〜１８は＃で示した位置
である。Regarding the obtained dielectric ceramic, the relative permittivity ε and Q at 3 GHz and the temperature coefficient τr of the resonance frequency at -25 to +75°C were measured. The only difference in characteristics depending on the measurement frequency is Q, and Q can be considered to be inversely proportional to frequency. That is, the Q value at IGHz is three times that at 3GHz. The results are shown in Table 1, Composition No., Examples 1 to 22 and Comparative Example 2.
3 to 28. Also, Fig. 1 shows BaO-Ti02-R
The composition range of the present invention is within the hexagonal frame (however, the area on the line is outside the range), and the numbers in Figure 1 indicate the composition No.
, where No. 3 to 18 are the positions indicated by #.
第１表及び第１図から本発明のａ、ｂ、ｃ値の範囲を示
している０次にＮｄ２Ｏ，の一部をＧｄ、Ｏ，、Ｂｉ２
Ｏ。Table 1 and Figure 1 show the ranges of a, b, and c values of the present invention.
O.
に置換量の限定理由を第１表を用いて説明する。The reason for limiting the amount of substitution will be explained using Table 1.
実施例３〜５．９〜１３はそれぞれＲ２Ｏ３値を一定に
してＢｉ２Ｏ３のｙ値を帆０５〜０．２０，０．０５〜
０．２５に増加させた例を示す、この場合、Ｑ値はｙ値
が増加するにつれ減少する６例えばＮｏ、９のｙ値が０
．０５のＱ値２６８０は、Ｎｏ１３のｙ値が０．２５の
Ｑ値が許容範囲の１０５０と最低の値となっている。一
方ε、値はｙ値の増加と共に約８０から約１００に増加
している。In Examples 3 to 5.9 to 13, the y value of Bi2O3 was set to 05 to 0.20, and 0.05 to 0.05 while keeping the R2O3 value constant.
An example is shown in which the Q value is increased to 0.25. In this case, the Q value decreases as the y value increases. For example, if the y value of No. 9 is 0.
．． The Q value of No. 05 is 2680, and the Q value of No. 13 with a y value of 0.25 is 1050, which is the lowest value within the allowable range. On the other hand, the value of ε increases from about 80 to about 100 as the y value increases.
τ、はｙ値の０．１０〜０．１５の付近は０．１０前後
で最も改善されその効果がみられる。τ is most improved around 0.10 in the vicinity of the y value of 0.10 to 0.15, and its effect can be seen.
以上の点からｙ値はＱ値及びτ、値が本発明の目標値を
満足するためには０．２５以下が必要である。From the above points, the y value needs to be 0.25 or less in order for the Q value and τ value to satisfy the target values of the present invention.
次にＧｄ２Ｏ，の効果は、 ａ、ｂ、ｃ、ｙの値を同一
としてＧｄ２Ｏ，のＸ値を増加させたＮｏ、１０．１５
．１８のτＣは７，４．ｉｐｐｍ／ ”Ｃと減少しその
効果が顕著である。実施例１８からＧｄのＸ値が０．２
０でＱ値は１２５０でありＸ値の上限を０．２０とした
。Next, the effect of Gd2O, is No. 10.15, which increases the X value of Gd2O, with the values of a, b, c, and y the same.
．． 18's τC is 7,4. ippm/”C, and the effect is remarkable. From Example 18, the X value of Gd is 0.2
0, the Q value was 1250, and the upper limit of the X value was set to 0.20.
以上、詳説したように本発明はＢａ０−ＴｉＯ□−（Ｎ
ｄ−Ｇｄ−Ｂｉ）２０３系でＮｄ２Ｏ，の一部をＧｄ２
Ｏ３，Ｂｉ２Ｏ３で置換した特定の組成範囲で高いＱ値
、ε１値及び小さいτ、を得ることができる。特にＮｄ
２０１の一部をＢ ｉ ２０３のみの置換では得られな
い小さいτｆを、さらにＧｄ２０ｓの添加で得られる特
徴も有している。As explained in detail above, the present invention is based on Ba0-TiO□-(N
d-Gd-Bi) 203 system, part of Nd2O, is replaced with Gd2
A high Q value, ε1 value, and small τ can be obtained in a specific composition range in which O3 and Bi2O3 are substituted. Especially Nd
It also has a small τf which cannot be obtained by replacing a part of 201 with B i 203 alone, and which can be obtained by adding Gd20s.
ハ１発明の効果
ＢａＯ−Ｔｉ０２−（Ｎｄ−Ｇｄ−Ｂｉ）２０３系の本
発明の組成範囲の場合、高いε、値及びＱ値、及び低い
τｆ値を得、マイクロ波用誘電帯磁器の小型化に効果を
発揮するものである。C1 Effect of the invention In the case of the composition range of the present invention of BaO-Ti02-(Nd-Gd-Bi)203 system, high ε, value and Q value, and low τf value can be obtained, and a small size dielectrically charged ceramic for microwaves can be obtained. It is effective in increasing the number of people.
４、図面の説明
第１図はＢａｄ−Ｔｉ０２−（Ｎｄ−Ｇｄ−旧）２０３
系の３元系で六角枠内は本発明の組成範囲を示す、ただ
し。4. Explanation of drawings Figure 1 shows Bad-Ti02-(Nd-Gd-old) 203
However, in the ternary system, the hexagonal frame indicates the composition range of the present invention.
線上は本発明の組成範囲外である。また、各番号は組成
Ｎｏ、を示す、○は本発明、・は比較例である。Above the line is outside the composition range of the present invention. Further, each number indicates a composition number, ◯ indicates the present invention, and ◯ indicates a comparative example.
Claims (1)
リウム，酸化ビスマスからなる成分組成式（モル比率）
を ａ・ＢａＯ−ｂ・ＴｉＯ＿２−ｃ｛（１−ｘ−ｙ）Ｎｄ
＿２Ｏ＿３−ｘＧｄ＿２Ｏ＿３−ｙＢｉ＿２Ｏ＿３｝と
表わしたとき，ａ＋ｂ＋ｃ＝１，０．０５＜ａ＜０．２
５，０．６０＜ｂ＜０．８０，０．０５＜ｃ＜０．２５
，でかつ ０＜ｘ≦０．２０，０＜ｙ≦０．２５の範囲にあること
を特徴とする誘電体磁器組成物。[Claims] Component composition formula (molar ratio) consisting of barium oxide, titanium oxide, neodymium oxide, gadolinium oxide, and bismuth oxide
a・BaO−b・TiO_2−c{(1−x−y)Nd
_2O_3-xGd_2O_3-yBi_2O_3}, a+b+c=1, 0.05<a<0.2
5, 0.60<b<0.80, 0.05<c<0.25
, and in the range of 0<x≦0.20, 0<y≦0.25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63230832A JPH0637328B2 (en) | 1988-09-13 | 1988-09-13 | Dielectric porcelain composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63230832A JPH0637328B2 (en) | 1988-09-13 | 1988-09-13 | Dielectric porcelain composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0280366A true JPH0280366A (en) | 1990-03-20 |
| JPH0637328B2 JPH0637328B2 (en) | 1994-05-18 |
Family
ID=16913976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63230832A Expired - Fee Related JPH0637328B2 (en) | 1988-09-13 | 1988-09-13 | Dielectric porcelain composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0637328B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0647602A1 (en) * | 1993-10-09 | 1995-04-12 | Philips Patentverwaltung GmbH | Substituted barium-neodymium-titanium perovskite, dielectric, ceramic composition and capacitor, and microwave component containing said composition |
| WO1997021642A1 (en) * | 1995-12-12 | 1997-06-19 | Institut 'jozef Stefan' | Microwave dielectric ceramics composed of barium, neodymium, gadolinium, titanium and bismuth oxides |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3010156U (en) * | 1994-06-20 | 1995-04-25 | クレトイシ株式会社 | Cooling cap body |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5525690A (en) * | 1978-08-03 | 1980-02-23 | Howaldtswerke Deutsche Werft | Ship rudder construction |
| JPS593804A (en) * | 1982-06-30 | 1984-01-10 | 株式会社小糸製作所 | Lens of lamp for vehicle |
| JPS625509A (en) * | 1985-06-29 | 1987-01-12 | 太陽誘電株式会社 | Dielectric ceramic composition |
| JPS6229008A (en) * | 1985-07-29 | 1987-02-07 | 太陽誘電株式会社 | Dielectric ceramic composition |
| JPS62191463A (en) * | 1986-02-17 | 1987-08-21 | 沖電気工業株式会社 | Dielectric ceramics composition for microwave |
-
1988
- 1988-09-13 JP JP63230832A patent/JPH0637328B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5525690A (en) * | 1978-08-03 | 1980-02-23 | Howaldtswerke Deutsche Werft | Ship rudder construction |
| JPS593804A (en) * | 1982-06-30 | 1984-01-10 | 株式会社小糸製作所 | Lens of lamp for vehicle |
| JPS625509A (en) * | 1985-06-29 | 1987-01-12 | 太陽誘電株式会社 | Dielectric ceramic composition |
| JPS6229008A (en) * | 1985-07-29 | 1987-02-07 | 太陽誘電株式会社 | Dielectric ceramic composition |
| JPS62191463A (en) * | 1986-02-17 | 1987-08-21 | 沖電気工業株式会社 | Dielectric ceramics composition for microwave |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0647602A1 (en) * | 1993-10-09 | 1995-04-12 | Philips Patentverwaltung GmbH | Substituted barium-neodymium-titanium perovskite, dielectric, ceramic composition and capacitor, and microwave component containing said composition |
| WO1997021642A1 (en) * | 1995-12-12 | 1997-06-19 | Institut 'jozef Stefan' | Microwave dielectric ceramics composed of barium, neodymium, gadolinium, titanium and bismuth oxides |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0637328B2 (en) | 1994-05-18 |
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