JP2002220279A - マイクロ波用誘電体磁器組成物 - Google Patents
マイクロ波用誘電体磁器組成物Info
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- JP2002220279A JP2002220279A JP2001015566A JP2001015566A JP2002220279A JP 2002220279 A JP2002220279 A JP 2002220279A JP 2001015566 A JP2001015566 A JP 2001015566A JP 2001015566 A JP2001015566 A JP 2001015566A JP 2002220279 A JP2002220279 A JP 2002220279A
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- temperature coefficient
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- 239000000203 mixture Substances 0.000 title claims abstract description 37
- 239000000919 ceramic Substances 0.000 title claims abstract description 11
- 229910052779 Neodymium Inorganic materials 0.000 claims description 6
- 229910052772 Samarium Inorganic materials 0.000 claims description 5
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 13
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 1
- 238000000034 method Methods 0.000 description 12
- 229910010413 TiO 2 Inorganic materials 0.000 description 10
- 229910052573 porcelain Inorganic materials 0.000 description 9
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910018068 Li 2 O Inorganic materials 0.000 description 3
- 229910002367 SrTiO Inorganic materials 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 2
- 229910002637 Pr6O11 Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
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Abstract
きい磁器組成物にτfをプラス側に大きな磁器組成物を
添加配合することにより、誘電率εが大きく、共振周波
数の温度係数τfが0に近く、Q値の大きな誘電体磁器
組成物を得る。 【解決手段】 Li2O−R2O3−TiO2系組成物にお
いて、特定量のBi2O3を含有させて誘電率εの向上を
図り、特定量のMO(M:Ca,Srの1種又は2種)
の含有により、τfをプラス側にシフトさせ、Qfの大
幅な改善を図り、さらにMO(M:Ca,Srの1種又
は2種)と共に特定量のNa2Oを含有させることによ
り、特にεr>150の材料において、Qfを高い値を
保ちながら、τfを0付近に制御できる。
Description
イクロ波領域で用いる共振器材料またはコンデンサー材
料などに使用されるマイクロ波用誘電体磁器組成物に関
する。
た衛星通信放送または移動体識別装置などの送受信機に
おいて用いられる共振器、フィルター、コンデンサーに
誘電体が用いられている。
ば、BaO−TiO2−Nd2O3−Bi2O3系組成物が
提案(特開昭61−8806号公報)されている。前記
組成物は、誘電率εは70〜110程度であり、誘電体
共振器またはコンデンサーを構成する場合、誘電率εが
大きい材料を使用するほど、共振器の寸法を小さくでき
るので、より大きい誘電率εを有する材料が望まれる。
えば、SrTiO3,CaTiO3等があるが、その誘電
率εは300及び180と非常に大きいが、共振周波数
の温度係数τfが+1700ppm/℃及び+800p
pm/℃と非常に大きいため、使用することはできな
い。
fを下げる方法としては、できるだけ誘電率εが大き
く、かつ温度係数τfがマイナスの値である材料を組み
合せる方法があり、この方法によれば、適当な組合せに
より誘電率εが大きく、かつ共振周波数の温度係数τf
の小さい磁器組成物が得られる。
11009号公報には、誘電率εが大きく、温度係数τ
fがマイナスの値である材料として、組成式が(A1+
1/2・B3+ 1/2)TiO3で表され、A1+はLi1+、B3+
はNd3+、Sm3+、Co3+またはPr3+である材料を組
み合せることにより、誘電率εが大きく、且つ共振周波
数の温度係数τfが0に近い磁器組成物が得られること
が提案されている。
小型化への要求が厳しく、かかる装置に使用される共振
器、フィルター、コンデンサーの誘電体に、さらに高誘
電率εを有する材料を使用することが強く求められてい
る。
物に要求される特性に鑑み、共振周波数の温度係数τf
がマイナス側に大きい磁器組成物にτfをプラス側に大
きな磁器組成物を添加配合することにより、誘電率εが
大きく、共振周波数の温度係数τfが0に近く、Q値の
大きな誘電体磁器組成物を得ることを目的とする。
大きく、共振周波数の温度係数τfが0に近く、Q値の
大きな誘電体磁器組成物を目的に、先に組成式がLi2
O−Na2O−Bi2O3−R2O3−TiO2で表され、R
2O3はLa2O3、Nd2O3、Sm2O3、Co2O 3又はP
r2O3の1種又は2種以上を含む誘電体磁器組成物を提
案(特願2000−337141号)した。
i2O3−R2O3−SrTiO3で表され、R2O3はLa2
O3、Nd2O3、Sm2O3、Co2O3又はPr2O3の1
種又は2種以上を含む誘電体磁器組成物を提案(特願2
000−340104号)した。
i2O−R2O3−TiO2系組成物でRはLa,Nd,P
r,Smのうちの1種または2種以上において、特定量
のBi2O3、Na2O及びMO(M:Ca、Srの1種
又は2種)を共有することにより、すぐれた誘電特性を
安定して得られることを知見した。
−TiO2系組成物において、特定量のBi2O3を含有
させることにより、誘電率εの向上を図り、且つ特定量
のMO(M:Ca,Srの1種又は2種)の含有によ
り、τfをプラス側にシフトするのみならず、Qfの大
幅な改善効果が得られることを知見した。
くなりすぎ、Qfを一定値に保ちながら、τfを0に近
づけることが困難なため、MO(M:Ca,Srの1種
又は2種)と共に特定量のNa2Oを含有させることに
より、特にεr>150の材料において、Qfを高い値
を保ちながら、τfを0付近に制御可能であることを知
見し、この発明を完成した。
O−bNa2O−cR2O3−dBi2O3−eMO−fT
iO2(a+b+c+d+e+f=100、a,b,
c,d,e,fはモル%)で表され、RはNd,Sm,
Pr,Laのうち1種又は2種以上を含み、MはCa,
Srのうち1種又は2種を含み、a,b,c,d,e,
fは、5<a<15 、0<b<10 、3<c<15
、1<d<15 、1<e<30 、40<f<75
を満足することを特徴とするマイクロ波用誘電体磁器
組成物である。
a2O−R2O3−Bi2O3−MO−TiO2系組成物
(R:Nd,Sm,Pr,Laの1種又は2種以上、M
はCa,Srの1種または2種)において、Li2Oが
5モル%未満では誘電率が低く、且つτfがプラス側に
大きくなりすぎ、又15モル%を超えるとLi2Oは低
融点であり、焼結時に磁器組成物が敷板や敷粉と反応し
て融着する問題があり好ましくない。よって、Li2O
(a)は、5<a<15モル%の範囲とする。
がプラス側に大きくなりすぎると共にQfが低下する問
題があり好ましくない。よって、Na2O(b)は、0
<b<10モル%の範囲とする。
La3+のうちの1種または2種以上)は、3モル%未満
では誘電率が低く、Qも悪くなり、15モル%を超える
とあまり効果がなく、且つコスト高となるので好ましく
ない。よって、R2O3(c)は、3<c<15モル%の
範囲とする。
あり、少なくとも1モル%以上の含有が必要であるが、
低融点のため15モル%を超えると焼結時に磁器組成物
が敷板や敷粉と反応して融着する恐れがあり好ましくな
い。よって、Bi2O3(d)は、1<d<15モル%の
範囲とする。
2種)の含有は、Qfの向上及び温度係数τfを向上さ
せる効果があるが、1モル%未満ではQfの向上効果及
び温度係数τfの向上効果が少なく、又30モル%を超
えると温度係数でτfがプラス側に大きくなり過ぎ好ま
しくない。よって、MO(e)は、1<e<30モル%
の範囲とする。
所要の結晶相が得られず、所要の誘電特性が得られず、
75モル%を超えるとTiO2の単体相が出現し、Qf
が著しく低下する問題があり好ましくない。よって、f
TiO2は、40<f<75モル%の範囲とする。
−dBi2O3−eMO−fTiO 2 (a+b+c+d
+e+f=100、a,b,c,d,e,fはモル%、
RはNd,Sm,Pr,Laのうち1種又は2種以上、
MはCa,Srのうち1種又は2種)の混合物が得られ
るよう、原料にTiO2、Bi2O3、LiCO3、Nd2
O3、Sm2O3、Pr6O11、La2O3、Na2CO3、C
aCO3、SrCO3、の高純度粉末を所要のモル分率に
なるように表1〜表2のごとく秤量、配合し、ボールミ
ルにより5〜20時間混合した。
間〜5時間の仮焼を行った。その後再び2〜50時間粉
砕し、前記粉砕粉に有機結合剤を加えて造粒、分級後、
2〜3T/cm2の圧力で直径10mm、厚み6mmの
円板状に成形した。前記成形体を1200℃〜1400
℃に1〜5時間焼結した後、焼結体の厚みが直径の1/
2になるように両面研磨し、測定試料を作成した。
を用いて、測定周波数3GHzにて誘電率ε、Q値及び
共振周波数の温度係数τfを測定した。表3に測定試料
の誘電特性の測定結果を示す。
いて、特定量のBi2O3を含有させて誘電率εの向上を
図り、特定量のMO(M:Ca,Srの1種又は2種)
の含有により、τfをプラス側にシフトさせ、Qfの大
幅な改善を図り、さらにMO(M:Ca,Srの1種又
は2種)と共に特定量のNa2Oを含有させることによ
り、特にεr>150の材料において、Qfを高い値を
保ちながら、τfを0付近に制御できる。
例に明らかなように誘電率εが大きく、共振周波数の温
度係数τfが0に近く、大きいQ値が得られており、数
GHz帯のマイクロ波を利用した衛星通信放送または移
動体識別装置などの送受信機において用いられる共振
器、フィルター、コンデンサーの誘電体に最適である。
えば、SrTiO3,CaTiO3等があり、その誘電率
εは300及び180と非常に大きいが、共振周波数の
温度係数τfが+1700ppm/℃及び+800pp
m/℃と非常に大きいため、使用することはできない。
所要の結晶相が得られず、所要の誘電特性が得られず、
75モル%を超えるとTiO2の単体相が出現し、Qf
が著しく低下する問題があり好ましくない。よって、T
iO2 (f)は、40<f<75モル%の範囲とする。
−dBi2O3−eMO−fTiO 2 (a+b+c+d
+e+f=100、a,b,c,d,e,fはモル%、
RはNd,Sm,Pr,Laのうち1種又は2種以上、
MはCa,Srのうち1種又は2種)の混合物が得られ
るよう、原料にTiO2、Bi2O3、Li 2 CO3、Nd2
O3、Sm2O3、Pr6O11、La2O3、Na2CO3、C
aCO3、SrCO 3、の高純度粉末を所要のモル分率に
なるように表1〜表2のごとく秤量、配合し、ボールミ
ルにより5〜20時間混合した。
Claims (1)
- 【請求項1】 組成式がaLi2O−bNa2O−cR2
O3−dBi2O3−eMO−fTiO2 (a+b+c+
d+e+f=100、a,b,c,d,e,fはモル
%)で表され、RはNd,Sm,Pr,Laのうち1種
又は2種以上を含み、MはCa,Srのうち1種又は2
種を含み、a,b,c,d,e,fは下記値を満足する
マイクロ波用誘電体磁器組成物。5<a<15 、0<
b<10 、3<c<15 、1<d<15 、1<e
<30 、40<f<75
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JP2001015566A JP2002220279A (ja) | 2001-01-24 | 2001-01-24 | マイクロ波用誘電体磁器組成物 |
DE60115957T DE60115957D1 (de) | 2001-01-24 | 2001-04-25 | Dielektrische keramische zusammensetzung für mikrowellenanwendungen |
KR10-2002-7011954A KR100492674B1 (ko) | 2001-01-24 | 2001-04-25 | 마이크로파 유전체 세라믹 조성물 |
US10/239,305 US6777362B2 (en) | 2001-01-24 | 2001-04-25 | Microwave dielectric ceramic composition |
PCT/JP2001/003588 WO2002059058A1 (en) | 2001-01-24 | 2001-04-25 | Microwave dielectric ceramic composition |
AT01925924T ATE312801T1 (de) | 2001-01-24 | 2001-04-25 | Dielektrische keramische zusammensetzung für mikrowellenanwendungen |
EP01925924A EP1353886B1 (en) | 2001-01-24 | 2001-04-25 | Microwave dielectric ceramic composition |
CNB018069991A CN1241873C (zh) | 2001-01-24 | 2001-04-25 | 微波介质陶瓷组合物 |
TW090126690A TWI235141B (en) | 2001-01-24 | 2001-10-29 | Microwave dielectric ceramic composition |
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EP (1) | EP1353886B1 (ja) |
JP (1) | JP2002220279A (ja) |
KR (1) | KR100492674B1 (ja) |
CN (1) | CN1241873C (ja) |
AT (1) | ATE312801T1 (ja) |
DE (1) | DE60115957D1 (ja) |
TW (1) | TWI235141B (ja) |
WO (1) | WO2002059058A1 (ja) |
Cited By (2)
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CN110668817A (zh) * | 2019-10-31 | 2020-01-10 | 西安交通大学 | 一种超低温烧结的钠基复合微波介质陶瓷材料及其制备方法 |
CN111875373A (zh) * | 2015-05-27 | 2020-11-03 | 爱普科斯公司 | 基于铋钠锶钛酸盐的介电组合物、其介电元件、电子组件和层叠电子组件 |
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CN1331807C (zh) * | 2003-10-23 | 2007-08-15 | 浙江大学 | 一种高介电常数低温烧结微波介质陶瓷及其制备方法 |
JP2005263534A (ja) * | 2004-03-17 | 2005-09-29 | Sanyo Electric Co Ltd | 誘電体磁器組成物及びそれを用いた積層セラミック部品 |
CN102584235A (zh) * | 2012-02-24 | 2012-07-18 | 浙江大学 | 低损耗微波介质陶瓷 |
CN103011814B (zh) * | 2012-10-13 | 2014-05-21 | 中国计量学院 | 微波介质陶瓷及其制备工艺 |
CN114907112B (zh) * | 2022-04-02 | 2023-06-06 | 西南应用磁学研究所(中国电子科技集团公司第九研究所) | 一种低温度系数高介低损耗微波电子陶瓷材料及制备方法 |
CN116283290B (zh) * | 2023-03-06 | 2024-03-29 | 哈尔滨工业大学 | 一种微波介质陶瓷材料及其制备方法和应用 |
Citations (2)
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JPH05211009A (ja) * | 1991-01-23 | 1993-08-20 | Sanyo Electric Co Ltd | マイクロ波用誘電体磁器組成物 |
JPH08109064A (ja) * | 1993-02-03 | 1996-04-30 | Sanyo Electric Co Ltd | マイクロ波用誘電体磁器組成物 |
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US5188993A (en) * | 1991-01-23 | 1993-02-23 | Sanyo Electric Co., Ltd. | Microwave dielectric ceramic composition |
JPH11310455A (ja) * | 1998-02-27 | 1999-11-09 | Murata Mfg Co Ltd | 誘電体磁器組成物およびそれを用いたセラミック電子部品 |
JP2000086338A (ja) * | 1998-09-16 | 2000-03-28 | Ngk Spark Plug Co Ltd | 誘電体セラミックス |
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- 2001-01-24 JP JP2001015566A patent/JP2002220279A/ja active Pending
- 2001-04-25 CN CNB018069991A patent/CN1241873C/zh not_active Expired - Fee Related
- 2001-04-25 AT AT01925924T patent/ATE312801T1/de not_active IP Right Cessation
- 2001-04-25 DE DE60115957T patent/DE60115957D1/de not_active Expired - Lifetime
- 2001-04-25 US US10/239,305 patent/US6777362B2/en not_active Expired - Fee Related
- 2001-04-25 KR KR10-2002-7011954A patent/KR100492674B1/ko not_active IP Right Cessation
- 2001-04-25 EP EP01925924A patent/EP1353886B1/en not_active Expired - Lifetime
- 2001-04-25 WO PCT/JP2001/003588 patent/WO2002059058A1/en active IP Right Grant
- 2001-10-29 TW TW090126690A patent/TWI235141B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05211009A (ja) * | 1991-01-23 | 1993-08-20 | Sanyo Electric Co Ltd | マイクロ波用誘電体磁器組成物 |
JPH08109064A (ja) * | 1993-02-03 | 1996-04-30 | Sanyo Electric Co Ltd | マイクロ波用誘電体磁器組成物 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111875373A (zh) * | 2015-05-27 | 2020-11-03 | 爱普科斯公司 | 基于铋钠锶钛酸盐的介电组合物、其介电元件、电子组件和层叠电子组件 |
CN110668817A (zh) * | 2019-10-31 | 2020-01-10 | 西安交通大学 | 一种超低温烧结的钠基复合微波介质陶瓷材料及其制备方法 |
Also Published As
Publication number | Publication date |
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KR100492674B1 (ko) | 2005-06-07 |
TWI235141B (en) | 2005-07-01 |
US20030100437A1 (en) | 2003-05-29 |
DE60115957D1 (de) | 2006-01-19 |
EP1353886A1 (en) | 2003-10-22 |
EP1353886B1 (en) | 2005-12-14 |
US6777362B2 (en) | 2004-08-17 |
ATE312801T1 (de) | 2005-12-15 |
CN1241873C (zh) | 2006-02-15 |
WO2002059058A1 (en) | 2002-08-01 |
KR20020092984A (ko) | 2002-12-12 |
CN1419524A (zh) | 2003-05-21 |
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