JP2006290728A - 誘電体磁器組成物及びその製造方法 - Google Patents
誘電体磁器組成物及びその製造方法 Download PDFInfo
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Abstract
【解決手段】 誘電体磁器組成物の主成分としてBaO、Nd2O3、TiO2、MgO及びSiO2を所定の比率で含有し、前記誘電体磁器組成物の副成分としてZnO、B2O3、CuO及びアルカリ土類金属酸化物RO(R:アルカリ土類金属)を所定の比率で含有させ、さらに好ましくは、副成分としてAgを含有させるように構成する。
【選択図】なし
Description
9(モル%)≦x≦22(モル%)、
9(モル%)≦y≦29(モル%)、
61(モル%)≦z≦74(モル%)の範囲内にあるとともに、
x+y+z=100(モル%)の関係を満たし、
前記主成分における各成分の体積比率を表わすα、βがそれぞれ
15(体積%)≦α≦75(体積%)、
25(体積%)≦β≦85(体積%)の範囲にあるとともに、
α+β=100(体積%)の関係を満たし、
前記主成分に対して副成分として、亜鉛酸化物、ホウ素酸化物、銅酸化物およびアルカリ土類金属酸化物を含むとともに、これらの副成分をそれぞれ、aZnO、bB2O3、cCuOおよびdRO(Rはアルカリ土類金属)と表したとき、
前記主成分に対する前記各副成分の重量比率を表わすa、b、c、およびdがそれぞれ
0.1(重量%)≦a≦12.0(重量%)
0.1(重量%)≦b≦12.0(重量%)、
0.1(重量%)≦c≦9.0(重量%)、
0.2(重量%)≦d≦5.0(重量%)、
の関係を有してなるように構成される。
また、本発明の好ましい態様として、焼成温度が870℃以下の物性を有してなるように構成される。
本発明の誘電体磁器組成物は、組成式{α(xBaO・yNd2O3・zTiO2)+β(2MgO・SiO2)}と表記される主成分を含んでいる。
前述したように本発明の誘電体磁器組成物は、組成式{α(xBaO・yNd2O3・zTiO2)+β(2MgO・SiO2)}と表記される主成分を含み、BaOとNd2O3とTiO2のモル比率(モル%)を表わすx、y、zがそれぞれ、
9(モル%)≦x≦22(モル%)、
9(モル%)≦y≦29(モル%)、
61(モル%)≦z≦74(モル%)の範囲内にあるとともに、
x+y+z=100(モル%)の関係を満たすように構成されている。
15(体積%)≦α≦75(体積%)、
25(体積%)≦β≦85(体積%)の範囲にあるとともに、
α+β=100(体積%)の関係を満たすように構成されている。
15(体積%)≦α≦75(体積%)、
25(体積%)≦β≦85(体積%)、
α+β=100(体積%)の関係を満たすように構成され、さらに、αとβの好ましい範囲は、25(体積%)≦α≦65(体積%)、35(体積%)≦β≦75(体積%)、より好ましくは35(体積%)≦α≦55(体積%)、45(体積%)≦β≦65(体積%)とされる。
前述したように本発明の誘電体磁器組成物は、副成分として、亜鉛酸化物、ホウ素酸化物、銅酸化物およびアルカリ土類金属酸化物が含有される。さらに、より好ましい態様としてこれらの副成分に加えて銀(Ag)が含有される。
0.1(重量%)≦a≦12.0(重量%)
0.1(重量%)≦b≦12.0(重量%)、
0.1(重量%)≦c≦9.0(重量%)、
0.2(重量%)≦d≦5.0(重量%)となるように構成される。
次に、本発明における誘電体磁器組成物の製造方法について説明する。
本発明の誘電体磁器組成物の製造方法は、バリウム含有原料、ネオジム含有原料、チタン含有原料、マグネシウム含有原料、シリコン含有原料、亜鉛含有原料、ホウ素含有原料、銅含有原料及びアルカリ土類金属含有原料を焼成して、BaO−Nd2O3−TiO2−MgO−SiO2−ZnO−B2O3−CuO−RO(R:アルカリ土類金属)系誘電体磁器組成物を製造する方法であって、マグネシウム含有原料及びシリコン含有原料としてフォルステライト(2MgO・SiO2)粉末を使用している。
本発明の誘電体磁器組成物の製造方法は、バリウム含有原料、ネオジム含有原料、チタン含有原料、マグネシウム含有原料、シリコン含有原料、亜鉛含有原料、ホウ素含有原料、銅含有原料、アルカリ土類金属含有原料、及び銀(Ag)を含有させた混合物を焼成してBaO−Nd2O3−TiO2−MgO−SiO2−ZnO−B2O3−CuO−RO(Rはアルカリ土類金属)−Ag系誘電体磁器組成物を製造する方法であって、マグネシウム含有原料及びシリコン含有原料としてフォルステライト(2MgO・SiO2)粉末を使用している。
(試料の作製と所望の物性の測定方法)
下記の要領で表1に示されるような種々の誘電体磁器組成物の試料を製造した。主成分組成を特定するα、β、x、y、およびz、並びに副成分組成の添加量を特定するa、b、cおよびdやRの定義は上述したとおりである。
(試料の作製と所望の物性の測定方法)
次いで、上記実験例1と同様な製造方法で下記表2に示されるような種々の誘電体磁器組成物の試料を製造した。
次に、副成分としてのAgの添加がさらに低温焼結性に及ぼす影響を確認するための実験を行なった。すなわち、誘電体磁器組成物の副成分としてZnO、B2O3、CuO、アルカリ土類金属酸化物RO(R:アルカリ土類金属)、およびAgを含有させた場合の実験を行い、Ag添加によって、さらなる低温焼成化が可能となることを確認した。
下記の要領で誘電体磁器組成物の試料を製造した。主成分組成を特定するα、β、x、y、およびz、並びに副成分組成の添加量を特定するa、b、c、dおよびeやRの定義は上述したとおりである。
熱機械分析装置(マック・サイエンス社製:TMA4000S)にて、測定温度範囲:室温〜1000℃、昇温速度:10℃/minの条件で、熱収縮測定を行なった。
測定温度と収縮率(負の膨張率)の関係を図3のグラフに示した。これらの測定結果より、Ag=0wt%の場合と比較して、Agの含有率が1.0wt%、2.0wt%と多くなるに連れ、グラフは低温側にシフトする傾向が生じており、Agの添加によって、さらなる低温焼成化が図られていることがわかる。
測定には、860℃、880℃、および900℃の各焼成温度により焼成したチップコンデンサを用いた。
プレシジョンLCRメータ(ヒューレット・パッカード社製:4284A)にて、周波数:1kHz,入力信号レベル(測定電圧):1Vrmsの条件下で、静電容量Cpを測定した。なお、測定数は、各15個とした。
デジタル絶縁計(東亜電波工業製:DSM−8103)にて、DC50Vを30秒間印加した後の絶縁抵抗IRを測定した。測定数は、各5個とした。
Claims (10)
- 主成分として、組成式{α(xBaO・yNd2O3・zTiO2)+β(2MgO・SiO2)}と表される成分を含み、BaOとNd2O3とTiO2のモル比率を表わすx、y、zがそれぞれ、
9(モル%)≦x≦22(モル%)、
9(モル%)≦y≦29(モル%)、
61(モル%)≦z≦74(モル%)の範囲内にあるとともに、
x+y+z=100(モル%)の関係を満たし、
前記主成分における各成分の体積比率を表わすα、βがそれぞれ
15(体積%)≦α≦75(体積%)、
25(体積%)≦β≦85(体積%)の範囲にあるとともに、
α+β=100(体積%)の関係を満たし、
前記主成分に対して副成分として、亜鉛酸化物、ホウ素酸化物、銅酸化物およびアルカリ土類金属酸化物を含むとともに、これらの副成分をそれぞれ、aZnO、bB2O3、cCuOおよびdRO(Rはアルカリ土類金属)と表したとき、
前記主成分に対する前記各副成分の重量比率を表わすa、b、c、およびdがそれぞれ
0.1(重量%)≦a≦12.0(重量%)
0.1(重量%)≦b≦12.0(重量%)、
0.1(重量%)≦c≦9.0(重量%)、
0.2(重量%)≦d≦5.0(重量%)、
の関係を有してなることを特徴とする誘電体磁器組成物。 - 前記アルカリ土類金属Rが、Ba、Sr、Caのグループから選ばれた少なくとも1種である請求項1に記載の誘電体磁器組成物。
- フォルステライト(2MgO・SiO2)結晶を含有してなる請求項1または請求項2に記載の誘電体磁器組成物。
- さらに副成分として、Agを含んでなる請求項1ないし請求項3のいずれかに記載の誘電体磁器組成物。
- 前記主成分に対するAgの金属成分としての重量比率をeAgと表したとき、
0.3(重量%)≦e≦3.0(重量%)
である請求項4に記載の誘電体磁器組成物。 - 焼成温度が870℃以下の物性を有してなる請求項1ないし請求項5のいずれかに記載の誘電体磁器組成物。
- 比誘電率が50以下の物性を有してなる請求項1ないし請求項5のいずれかに記載の誘電体磁器組成物。
- 比誘電率が20〜40の範囲、Q・f値が4000GHz以上の物性を有してなる請求項1ないし請求項5のいずれかに記載の誘電体磁器組成物。
- バリウム含有原料、ネオジム含有原料、チタン含有原料、マグネシウム含有原料、シリコン含有原料、亜鉛含有原料、ホウ素含有原料、銅含有原料及びアルカリ土類金属含有原料を焼成して、
BaO−Nd2O3−TiO2−MgO−SiO2−ZnO−B2O3−CuO−RO(Rはアルカリ土類金属)系誘電体磁器組成物を製造する方法であって、
前記マグネシウム含有原料及び前記シリコン含有原料としてフォルステライト(2MgO・SiO2)粉末を使用してなることを特徴とする誘電体磁器組成物の製造方法。 - バリウム含有原料、ネオジム含有原料、チタン含有原料、マグネシウム含有原料、シリコン含有原料、亜鉛含有原料、ホウ素含有原料、銅含有原料、アルカリ土類金属含有原料及び銀(Ag)を含有させた混合物を焼成して、
BaO−Nd2O3−TiO2−MgO−SiO2−ZnO−B2O3−CuO−RO(Rはアルカリ土類金属)−Ag系誘電体磁器組成物を製造する方法であって、
前記マグネシウム含有原料及び前記シリコン含有原料としてフォルステライト(2MgO・SiO2)粉末を使用してなることを特徴とする誘電体磁器組成物の製造方法。
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JP2008230948A (ja) * | 2007-02-22 | 2008-10-02 | Tdk Corp | 誘電体磁器組成物 |
WO2009014092A1 (ja) | 2007-07-23 | 2009-01-29 | Tdk Corporation | セラミックス基板及びその製造方法、並びに誘電体磁器組成物 |
JP2009023893A (ja) * | 2007-07-23 | 2009-02-05 | Tdk Corp | セラミックス基板及びその製造方法 |
JP2009023895A (ja) * | 2007-07-23 | 2009-02-05 | Tdk Corp | セラミックス基板及びその製造方法 |
JP2009227483A (ja) * | 2008-03-19 | 2009-10-08 | Tdk Corp | 誘電体磁器組成物 |
JP2010235325A (ja) * | 2009-03-30 | 2010-10-21 | Tdk Corp | 誘電体磁器組成物 |
JP2010235327A (ja) * | 2009-03-30 | 2010-10-21 | Tdk Corp | 誘電体磁器組成物 |
WO2017115702A1 (ja) * | 2015-12-28 | 2017-07-06 | 日立金属株式会社 | 誘電体セラミックスの製造方法および誘電体セラミックス |
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JP5315544B2 (ja) | 2009-03-25 | 2013-10-16 | Tdk株式会社 | 誘電体磁器組成物およびこれを用いた電子部品 |
US8420560B2 (en) | 2010-03-31 | 2013-04-16 | Tdk Corporation | Dielectric ceramic, method for producing dielectric ceramic, and method for producing powder for producing dielectric ceramic |
JP5983265B2 (ja) * | 2011-12-12 | 2016-08-31 | Tdk株式会社 | 誘電体磁器組成物 |
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JP2008230948A (ja) * | 2007-02-22 | 2008-10-02 | Tdk Corp | 誘電体磁器組成物 |
WO2009014092A1 (ja) | 2007-07-23 | 2009-01-29 | Tdk Corporation | セラミックス基板及びその製造方法、並びに誘電体磁器組成物 |
JP2009023893A (ja) * | 2007-07-23 | 2009-02-05 | Tdk Corp | セラミックス基板及びその製造方法 |
JP2009023895A (ja) * | 2007-07-23 | 2009-02-05 | Tdk Corp | セラミックス基板及びその製造方法 |
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JP2009227483A (ja) * | 2008-03-19 | 2009-10-08 | Tdk Corp | 誘電体磁器組成物 |
JP2010235325A (ja) * | 2009-03-30 | 2010-10-21 | Tdk Corp | 誘電体磁器組成物 |
JP2010235327A (ja) * | 2009-03-30 | 2010-10-21 | Tdk Corp | 誘電体磁器組成物 |
WO2017115702A1 (ja) * | 2015-12-28 | 2017-07-06 | 日立金属株式会社 | 誘電体セラミックスの製造方法および誘電体セラミックス |
JPWO2017115702A1 (ja) * | 2015-12-28 | 2018-05-24 | 日立金属株式会社 | 誘電体セラミックスの製造方法および誘電体セラミックス |
US10696596B2 (en) | 2015-12-28 | 2020-06-30 | Hitachi Metals, Ltd. | Method for producing dielectric ceramic, and dielectric ceramic |
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