JPH04265269A - Dielectric ceramic for microwave - Google Patents
Dielectric ceramic for microwaveInfo
- Publication number
- JPH04265269A JPH04265269A JP3024461A JP2446191A JPH04265269A JP H04265269 A JPH04265269 A JP H04265269A JP 3024461 A JP3024461 A JP 3024461A JP 2446191 A JP2446191 A JP 2446191A JP H04265269 A JPH04265269 A JP H04265269A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- weight
- main component
- microwave
- amount
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 26
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 15
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 15
- 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
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims abstract description 10
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 claims abstract description 6
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims abstract 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 5
- 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 5
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 abstract description 13
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 abstract 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 9
- 230000007423 decrease Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001954 samarium oxide Inorganic materials 0.000 description 2
- 229940075630 samarium oxide Drugs 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000012856 weighed raw material Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Capacitors (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】この発明は、マイクロ波用誘電体
セラミックスに関するもので、特に、比誘電率(εr)
及び無負荷Q(Qu)が大きく、かつ、当該セラミック
スの組成を変化させることにより共振周波数の温度係数
(τf)を0を中心に任意の値に変化させることが出来
るマイクロ波用誘電体セラミックスに関するものである
。[Field of Industrial Application] This invention relates to dielectric ceramics for microwave use, and in particular, to
and dielectric ceramics for microwaves which have a large no-load Q (Qu) and whose temperature coefficient (τf) of the resonant frequency can be changed to any value around 0 by changing the composition of the ceramic. It is something.
【0002】0002
【従来の技術】マイクロ波帯用の誘電体共振器や温度補
償用コンデンサ等の構成材料として用いられる誘電体セ
ラミックスは、比誘電率(εr )及び無負荷Q(Qu
)が大きく、かつ、組成を変えることにより共振周波数
の温度係数(τf)が0を中心として正又は負の任意の
値になるものが必要とされている。[Prior Art] Dielectric ceramics used as constituent materials for dielectric resonators for microwave bands, temperature compensation capacitors, etc. have a relative dielectric constant (εr) and an unloaded Q (Qu
) is required, and by changing the composition, the temperature coefficient (τf) of the resonant frequency can be set to any positive or negative value centered around 0.
【0003】従来このような誘電体セラミックスとして
、例えば、この出願の出願人に係る特公昭61−146
06号公報に開示の(BaO)(TiO2)X系組成物
、Sm2O3及びLa2O3から成るものがあった。Conventionally, as such dielectric ceramics, for example, Japanese Patent Publication No. 61-146 filed by the applicant of this application,
No. 06 discloses a (BaO)(TiO2)X-based composition consisting of Sm2O3 and La2O3.
【0004】0004
【発明が解決しようとする課題】しかしながら、上述し
た従来のマイクロ波用誘電体セラミックスであって温度
係数が0(ppm/℃)付近の値(0も含む。以下、同
様。)を示すものは、比誘電率(εr)が最大でも80
程度であるため、誘電体共振器の小型化を図るうえで不
充分なものであった。[Problems to be Solved by the Invention] However, among the above-mentioned conventional microwave dielectric ceramics, those exhibiting a temperature coefficient of around 0 (ppm/°C) (including 0; the same shall apply hereinafter) are , the relative permittivity (εr) is at most 80
This was insufficient for miniaturizing dielectric resonators.
【0005】この発明はこのような点に鑑みなされたも
のであり、従ってこの発明の目的は、温度係数(τf)
が0(ppm/℃)付近となる組成とした場合において
も比誘電率(εr )及び無負荷Q(Qu)が従来より
大きい値を示すマイクロ波用誘電体セラミックスを提供
することにある。[0005] The present invention was made in view of the above points, and therefore, an object of the present invention is to improve the temperature coefficient (τf).
It is an object of the present invention to provide dielectric ceramics for microwaves which exhibit larger relative permittivity (εr) and no-load Q (Qu) than conventional ones even when the composition is such that εr is around 0 (ppm/°C).
【0006】[0006]
【課題を解決するための手段】この目的の達成を図るた
め、この発明のマイクロ波用誘電体セラミックスは、酸
化バリウム(BaO)、二酸化チタン(TiO2)、
酸化サマリウム(Sm2O3)、酸化ランタン(La2
O3)、酸化ネオジウム(Nd2O3)及び酸化ビスマ
ス(Bi2O3)から成る組成式が下記(1)式で表わ
される主成分と、該主成分に対し5重量%以下(但し、
0%は除く)の酸化鉛(PbO)及び5重量%以下(但
し、0%は除く)の酸化セリウム(CeO2)とを含ん
で成ることを特徴とする。[Means for Solving the Problems] In order to achieve this object, the microwave dielectric ceramics of the present invention include barium oxide (BaO), titanium dioxide (TiO2),
Samarium oxide (Sm2O3), lanthanum oxide (La2
O3), neodymium oxide (Nd2O3) and bismuth oxide (Bi2O3) as the main component represented by the following formula (1), and 5% by weight or less (however,
It is characterized by containing lead oxide (PbO) of 5% by weight or less (excluding 0%) and cerium oxide (CeO2) of 5% by weight or less (excluding 0%).
【0007】[0007]
【式2】[Formula 2]
【0008】[0008]
【0009】(但し、(1)式中のX、Y、Z、Vはモ
ル%で示して、
11.5≦X≦21.0
60.0≦Y≦76.0
6.5≦Z≦26.0
0<V≦10.0
X+Y+Z+V=100
の範囲内であり、
W1、W2はモル比で示して、
0<W1<1.0
0<W2<1.0
0<1−W1−W2<1.0
の範囲内である。)。(However, in formula (1), X, Y, Z, and V are expressed in mol%, and 11.5≦X≦21.0 60.0≦Y≦76.0 6.5≦Z≦ 26.0 0<V≦10.0 X+Y+Z+V=100 Within the range of <1.0).
【0010】0010
【作用】この発明のマイクロ波用誘電体セラミックスに
よれば、後述する実験結果からも明らかなように、その
温度係数(τf)が当該セラミックスの組成を変えるこ
とにより0(ppm/℃)を中心に正又は負に変化する
。然も、この発明で主張する組成においては、誘電体セ
ラミックスの比誘電率(εr)及び無負荷Q(QU)共
に、発明の範囲外の組成の誘電体セラミックスのものに
比し、大きな値を示す。[Operation] According to the dielectric ceramic for microwave use of the present invention, as is clear from the experimental results described later, the temperature coefficient (τf) is centered around 0 (ppm/°C) by changing the composition of the ceramic. change to positive or negative. However, with the composition claimed in this invention, both the dielectric constant (εr) and the unloaded Q (QU) of the dielectric ceramic have larger values than those of the dielectric ceramic with a composition outside the scope of the invention. show.
【0011】[0011]
【実施例】以下、この発明の実施例につき説明する。[Embodiments] Examples of the present invention will be described below.
【0012】まず、実施例及び比較例の各マイクロ波用
誘電体セラミックスを以下に説明するように製造する。First, microwave dielectric ceramics of Examples and Comparative Examples were manufactured as described below.
【0013】出発原料には化学的に高純度の炭酸バリウ
ム(BaCO3)、二酸化チタン(TiO2)、酸化サ
マリウム(Sm2O3)、酸化ランタン(La2O3)
、酸化ネオジウム(Nd2O3 )、酸化ビスマス(B
i2O3)、酸化鉛(PbO)及び酸化セリウム(Ce
O2)をそれぞれ使用した。そして、これらの出発原料
を、互いに組成が異なる多数の実験用の誘電体セラミッ
クを作製するために、後記の表1〜表3に掲げたような
組成比率になるようにそれぞれ正確に秤量した。Starting materials include chemically high-purity barium carbonate (BaCO3), titanium dioxide (TiO2), samarium oxide (Sm2O3), and lanthanum oxide (La2O3).
, neodymium oxide (Nd2O3), bismuth oxide (B
i2O3), lead oxide (PbO) and cerium oxide (Ce
O2) were used, respectively. In order to produce a large number of experimental dielectric ceramics having different compositions, these starting materials were each accurately weighed so that the composition ratios were as listed in Tables 1 to 3 below.
【0014】秤量の終えた各原料は、ポットミルで純水
とともに混合し、次いで脱水乾燥し、その後空気雰囲気
において1050℃の温度で2時間仮焼した。The weighed raw materials were mixed with pure water in a pot mill, dehydrated and dried, and then calcined in an air atmosphere at a temperature of 1050° C. for 2 hours.
【0015】次に、この仮焼物をポットミルで純水とと
もに湿式粉砕した後脱水乾燥した。Next, this calcined product was wet-pulverized with pure water in a pot mill, and then dehydrated and dried.
【0016】次に、この粉砕し乾燥したものにバインダ
を添加して造粒した後、これを32メッシュの篩を通し
整粒して造粒粉を得た。Next, a binder was added to the pulverized and dried product to granulate it, and then the granulated powder was sized through a 32-mesh sieve to obtain granulated powder.
【0017】この造粒紛を、金型と油圧プレスとを用い
て、成形圧力1〜3ton/cm2にて直径16mm、
厚さ9mmの円板状に成形した。[0017] This granulated powder was molded into a diameter of 16 mm using a mold and a hydraulic press at a molding pressure of 1 to 3 ton/cm2.
It was molded into a disk shape with a thickness of 9 mm.
【0018】このようにして得られた成形体を高純度の
アルミナ匣に入れた後、1250〜1450℃の温度で
2時間空気中で焼成して、誘電体セラミックスを得た。The molded body thus obtained was placed in a high-purity alumina box and then fired in air at a temperature of 1250 to 1450°C for 2 hours to obtain a dielectric ceramic.
【0019】次に、上述の如く作製した実験用の各誘電
体セラミックスの特性を以下に説明するように測定する
。Next, the characteristics of each of the experimental dielectric ceramics produced as described above were measured as described below.
【0020】各誘電体セラミックスの比誘電率(εr
)及び無負荷Q(Qu)は、ハッキ・コールマン(Ha
kki−Coleman)法により測定した。また、共
振周波数の温度係数 (τf) は、従来公知の通り、
20℃における共振周波数f(20)を基準として、−
40℃と+85℃の温度におけるそれぞれの共振周波数
f(−40)、f(85)と温度差ΔT(この場合は8
5−(−40)=125)とから下記(2)式に従い求
めた。なお、これらの測定における共振周波数は3〜4
GHzであった。Relative permittivity (εr
) and unloaded Q (Qu) are Hakki-Coleman (Ha
It was measured by the Kki-Coleman) method. In addition, the temperature coefficient (τf) of the resonant frequency is, as is conventionally known,
Based on the resonant frequency f(20) at 20°C, −
Resonant frequencies f(-40) and f(85) at temperatures of 40°C and +85°C and temperature difference ΔT (in this case 8
5-(-40)=125) according to the following equation (2). Note that the resonant frequency in these measurements is 3 to 4.
It was GHz.
【0021】
τf={f(85)−f(−40)}/f(2
0)ΔT ・・・(2)各誘電体セラミックスの比誘
電率(εr)、無負荷Q(Qu)及び温度係数(τf)
を表1〜表3にそれぞれ示す。なお、これら表において
、*印を付した試料Noの試料は、この発明の範囲外の
比較例であることを示し、それ以外の試料Noの試料が
この発明の範囲内の実施例である。また、表中「RE」
は希土類酸化物((1)式中の{(Sm2O3)1−W
1−W2(La2O3)W1(Nd2O3)W2}部分
)を省略表示したものである。τf={f(85)−f(−40)}/f(2
0) ΔT...(2) Relative permittivity (εr), no-load Q (Qu), and temperature coefficient (τf) of each dielectric ceramic
are shown in Tables 1 to 3, respectively. In addition, in these tables, samples with sample numbers marked with * indicate comparative examples outside the scope of the present invention, and samples with other sample numbers are examples within the scope of the present invention. In addition, "RE" in the table
is a rare earth oxide ({(Sm2O3)1-W in formula (1)
1-W2(La2O3)W1(Nd2O3)W2} portion) is omitted.
【0022】[0022]
【表1】[Table 1]
【0023】[0023]
【0024】[0024]
【表2】[Table 2]
【0025】[0025]
【0026】[0026]
【表3】[Table 3]
【0027】[0027]
【0028】次に、上述のように行なった実験の結果に
ついて検討する。Next, the results of the experiment conducted as described above will be discussed.
【0029】主成分に対してCeO2の添加量が5重量
%以内の場合、比誘電率(εr)は、PbOの添加料が
5重量%までは添加量の増加と共に増大し、PbOの添
加量が5重量%を越えると急激に小さくなることが分る
。また、主成分に対してCeO2の添加量が5重量%以
内の場合、無負荷Q(Qu )は、PbOの添加量が増
大するにつれて減少し5重量%を越えると急激に小さく
なることが分る。また、主成分に対してCeO2の添加
量が5重量%以内の場合、温度係数(τf)は、PbO
の添加量が3重量%で最小値を示した後、PbOの添加
量の増大と共に増大しPbOの添加量が5重量%を越え
ると急激に増大することが分る。具体的には、試料No
6,11,26が、比誘電率(εr)が他のものに比べ
小さく、無負荷Q(Qu)も1000以下と小さく、温
度係数(τf)もプラスに大きいため、マイクロ波用誘
電体セラミックスとして不適当であることが分る。When the amount of CeO2 added to the main component is within 5% by weight, the relative permittivity (εr) increases as the amount of PbO added increases up to 5% by weight; It can be seen that when the amount exceeds 5% by weight, the value decreases rapidly. Furthermore, it was found that when the amount of CeO2 added to the main component is within 5% by weight, the unloaded Q (Qu) decreases as the amount of PbO added increases, and decreases rapidly when the amount of PbO added exceeds 5% by weight. Ru. Furthermore, when the amount of CeO2 added to the main component is within 5% by weight, the temperature coefficient (τf) is
It can be seen that after the addition amount of PbO shows a minimum value at 3% by weight, it increases as the addition amount of PbO increases, and increases rapidly when the addition amount of PbO exceeds 5% by weight. Specifically, sample No.
6, 11, and 26 have a smaller relative dielectric constant (εr) than others, a small no-load Q (Qu) of 1000 or less, and a positive temperature coefficient (τf), so they are suitable as dielectric ceramics for microwaves. It turns out that it is inappropriate as such.
【0030】一方、主成分に対しPbOの添加量が5重
量%以内の場合、比誘電率(εr)は、CeO2の添加
料が5重量%までは添加量の増加と共に僅かに小さくな
りCeO2の添加量が5重量%を越えると40以下と急
激に小さくなることが分る。また、主成分に対してPb
Oの添加量が5重量%以内の場合、無負荷Q(Qu )
は、CeO2の添加量が3重量%で最大値を示しそれ以
上では小さくなることが分る。また、主成分に対してP
bOの添加量が5重量%以内の場合、温度係数(τf)
は、CeO2の添加量が3重量%で最小値を示した後、
CeO2の添加量が5重量を越えるとプラスに急激に増
大することが分る。On the other hand, when the amount of PbO added to the main component is within 5% by weight, the relative permittivity (εr) slightly decreases with increasing amount of CeO2 additive up to 5% by weight. It can be seen that when the amount added exceeds 5% by weight, the value decreases rapidly to 40 or less. In addition, Pb for the main component
When the amount of O added is within 5% by weight, the unloaded Q (Qu)
It can be seen that the maximum value is reached when the amount of CeO2 added is 3% by weight, and becomes smaller when the amount of CeO2 added is 3% by weight. Also, P for the main component
If the amount of bO added is within 5% by weight, the temperature coefficient (τf)
shows the minimum value when the amount of CeO2 added is 3% by weight, and then
It can be seen that when the amount of CeO2 added exceeds 5 weight, there is a sharp positive increase.
【0031】以上詳細に説明したように、実用的に見て
、主成分の組成をXBaO・YTiO2・Z{(Sm2
O3)1−W1−W2(La2O3)W1(Nd2O3
)W2}・VBi2O3と表わしたとき、X,Y,Z,
Vがモル%で示して、11.5≦X≦21.0、60.
0≦Y≦76.0、6.5≦Z≦26.0、0<V≦1
0.0及びX+Y+Z+V=100の範囲内であり、W
1,W2がモル比で示して、0<W1<1.0、0<W
2<1.0及び0<1−W1−W2<1.0の範囲内で
ある主成分と、この主成分に対し5重量%以下(但し0
%は除く。)の酸化鉛及び5重量%以下(但し0%は除
く。)の酸化セリウムとを含んで成るものが、この発明
のマイクロ波用誘電体セラミックスとして適しているこ
とが分った。As explained in detail above, from a practical point of view, the composition of the main components is XBaO・YTiO2・Z{(Sm2
O3)1-W1-W2(La2O3)W1(Nd2O3
)W2}・VBi2O3, X, Y, Z,
V is expressed in mol%, 11.5≦X≦21.0, 60.
0≦Y≦76.0, 6.5≦Z≦26.0, 0<V≦1
0.0 and X+Y+Z+V=100, W
1, W2 is expressed as a molar ratio, 0<W1<1.0, 0<W
The main component is within the range of 2<1.0 and 0<1-W1-W2<1.0, and 5% by weight or less (however, 0
% is excluded. ) and 5% by weight or less (excluding 0%) of cerium oxide were found to be suitable as the microwave dielectric ceramic of the present invention.
【0032】なお、上述した実施例における誘電体セラ
ミックスの製造条件を、本発明の範囲内の好ましい特定
の条件の下で説明した。しかし、これは単なる例示にす
ぎないものであり、この発明がこの実施例にのみ限定さ
れるものでないことは明らかである。[0032] The conditions for manufacturing dielectric ceramics in the above-mentioned embodiments have been explained under specific preferred conditions within the scope of the present invention. However, this is merely an example, and it is clear that the invention is not limited to this embodiment.
【0033】[0033]
【発明の効果】上述した説明からも明らかなように、こ
の発明のマイクロ波用誘電体セラミックスは、マイクロ
波領域において比誘電率(εr)及び無負荷Q(QU)
が共に従来のものより大きく、さらに、組成を変化さ
せることにより温度係数(τf)を0(ppm/℃)を
中心として正又は負の任意の値に容易に変化させること
が出来る。これがため、マイクロ波帯の誘電体共振器或
は温度補償用コンデンサの構成材料として用いることが
出来工業的利用価値は大きい。Effects of the Invention As is clear from the above explanation, the microwave dielectric ceramic of the present invention has a high relative dielectric constant (εr) and an unloaded Q (QU) in the microwave region.
are both larger than the conventional ones, and furthermore, by changing the composition, the temperature coefficient (τf) can be easily changed to any positive or negative value centered around 0 (ppm/° C.). Therefore, it can be used as a constituent material for dielectric resonators in the microwave band or temperature compensation capacitors, and has great industrial utility value.
Claims (1)
ン(TiO2)、 酸化サマリウム(Sm2O3)、酸
化ランタン(La2O3)、酸化ネオジウム(Nd2O
3)及び酸化ビスマス(Bi2O3)から成る組成式が
下記(1)式で表わされる主成分と、該主成分に対し5
重量%以下(但し、0%は除く)の酸化鉛(PbO)及
び5重量%以下(但し、0%は除く)の酸化セリウム(
CeO2)とを含んで成ることを特徴とするマイクロ波
用誘電体セラミックス。 【式1】 (但し、(1)式中のX、Y、Z、Vはモル%で示して
、 11.5≦X≦21.0 60.0≦Y≦76.0 6.5≦Z≦26.0 0<V≦10.0 X+Y+Z+V=100 の範囲内であり、 W1、W2はモル比で示して、 0<W1<1.0 0<W2<1.0 0<1−W1−W2<1.0 の範囲内である。)。[Claim 1] Barium oxide (BaO), titanium dioxide (TiO2), samarium oxide (Sm2O3), lanthanum oxide (La2O3), neodymium oxide (Nd2O)
3) and bismuth oxide (Bi2O3), the main component is represented by the following formula (1), and the main component is 5
Lead oxide (PbO) up to 5% by weight (excluding 0%) and cerium oxide (excluding 0%) up to 5% by weight (excluding 0%)
A microwave dielectric ceramic characterized by comprising: [Formula 1] (However, in formula (1), X, Y, Z, and V are shown in mol%, 11.5≦X≦21.0 60.0≦Y≦76.0 6.5≦Z ≦26.0 0<V≦10.0 X+Y+Z+V=100 Within the range of (W2<1.0).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3024461A JP2685984B2 (en) | 1991-02-19 | 1991-02-19 | Dielectric ceramics for microwave |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3024461A JP2685984B2 (en) | 1991-02-19 | 1991-02-19 | Dielectric ceramics for microwave |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04265269A true JPH04265269A (en) | 1992-09-21 |
JP2685984B2 JP2685984B2 (en) | 1997-12-08 |
Family
ID=12138810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3024461A Expired - Fee Related JP2685984B2 (en) | 1991-02-19 | 1991-02-19 | Dielectric ceramics for microwave |
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JP (1) | JP2685984B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999062840A1 (en) * | 1996-11-07 | 1999-12-09 | Sumitomo Special Metals Co., Ltd. | Microwave dielectric ceramic composition |
WO1999062839A1 (en) * | 1998-06-04 | 1999-12-09 | Sumitomo Special Metals Co., Ltd. | Microwave dielectric ceramic composition |
US6274526B1 (en) * | 1999-11-25 | 2001-08-14 | Ube Industries, Ltd. | Dielectric ceramic composition for microwave |
-
1991
- 1991-02-19 JP JP3024461A patent/JP2685984B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999062840A1 (en) * | 1996-11-07 | 1999-12-09 | Sumitomo Special Metals Co., Ltd. | Microwave dielectric ceramic composition |
WO1999062839A1 (en) * | 1998-06-04 | 1999-12-09 | Sumitomo Special Metals Co., Ltd. | Microwave dielectric ceramic composition |
US6331499B1 (en) | 1998-06-04 | 2001-12-18 | Sumitomo Special Metals Co., Ltd. | Microwave dielectric ceramic composition |
US6274526B1 (en) * | 1999-11-25 | 2001-08-14 | Ube Industries, Ltd. | Dielectric ceramic composition for microwave |
Also Published As
Publication number | Publication date |
---|---|
JP2685984B2 (en) | 1997-12-08 |
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