JP7077704B2 - 圧電組成物および圧電素子 - Google Patents
圧電組成物および圧電素子 Download PDFInfo
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Description
[1]一般式ABO3で表されるペロブスカイト構造を有する複合酸化物と、銅と、クロム、ニッケルおよび亜鉛からなる群から選ばれる1つ以上の元素と、を含む圧電組成物であって、
ABO3におけるAサイト元素がカリウムであり、Bサイト元素がニオブ、または、ニオブおよびタンタルであり、
複合酸化物1モルに対して、前記銅の含有割合がCuO換算でαモル%であり、前記クロム、ニッケルおよび亜鉛からなる群から選ばれる1つ以上の元素の含有割合が、CrO3/2、NiO、ZnO換算でβモル%であり、
αが、0.2≦α≦2.5である関係を満足し、
βが、0.2≦β≦2.0である関係を満足することを特徴とする圧電組成物である。
1.圧電素子
1.1.圧電組成物
2.圧電素子の製造方法
3.本実施形態における効果
4.変形例
まず、本実施形態に係る圧電組成物が適用された圧電素子について説明する。圧電素子としては、本実施形態に係る圧電組成物が適用可能な素子であれば特に制限されない。本実施形態では、たとえば、圧電トランス、薄膜センサ、圧電超音波モータ等が例示される。
本実施形態に係る圧電組成物は、一般式ABO3で表されるペロブスカイト構造を有する複合酸化物を主成分として含有している。本実施形態では、主成分とは、圧電組成物100mol%に対して、90mol%以上を占める成分である。
次に、圧電素子の製造方法の一例について以下に説明する。
本実施形態では、圧電組成物に主成分として含まれるペロブスカイト構造を有する複合酸化物として、実質的にリチウム(Li)およびナトリウム(Na)をペロブスカイト構造中に有さないニオブ酸カリウム系の化合物を採用し、さらに、圧電組成物に銅(Cu)と、クロム(Cr)、ニッケル(Ni)および亜鉛(Zn)からなる群から選ばれる1つ以上の元素と、を所定の範囲内で含有させている。銅と上記の元素とを併用してそれらの含有量を所定の範囲内とすることにより、重要な圧電特性である電気機械結合係数k31を良好に維持しつつ、絶縁破壊強度を向上させることができる。
上述した実施形態では、圧電体部が単層である圧電素子について説明したが、圧電体部が積層された構成を有する圧電素子であってもよい。また、これらが組み合わされた構成を有する圧電素子であってもよい。
得られた分極前試料を150℃のシリコンオイル中で3kV/mmの電界を5分間印加し、分極処理を行い、圧電特性評価用試料(実施例1~25、比較例1~4)を得た。
1… 圧電体部
2,3… 電極
50… 圧電素子
10… 積層体
11… 圧電層
12… 内部電極層
21,22… 端子電極
Claims (4)
- 一般式ABO3で表されるペロブスカイト構造を有する複合酸化物と、銅と、クロム、ニッケルおよび亜鉛からなる群から選ばれる1つ以上の元素と、を含む圧電組成物であって、
前記ABO3におけるAサイト元素がカリウムであり、Bサイト元素がニオブ、または、ニオブおよびタンタルであり、
前記複合酸化物1モルに対して、前記銅の含有割合がCuO換算でαモル%であり、前記クロム、ニッケルおよび亜鉛からなる群から選ばれる1つ以上の元素の含有割合が、CrO3/2、NiO、ZnO換算でβモル%であり、
前記αが、0.2≦α≦2.5である関係を満足し、
前記βが、0.2≦β≦2.0である関係を満足することを特徴とする圧電組成物。 - 前記ABO3が、組成式Kx(Nb1-yTay)O3で表され、組成式中の前記xが、0.980≦x≦0.999である関係を満足することを特徴とする請求項1に記載の圧電組成物。
- 前記ABO3が、組成式Kx(Nb1-yTay)O3で表され、組成式中の前記yが、y≦0.100である関係を満足することを特徴とする請求項1または2に記載の圧電組成物。
- 請求項1から3のいずれかに記載の圧電組成物を含む圧電素子。
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JP2018056823A JP7077704B2 (ja) | 2018-03-23 | 2018-03-23 | 圧電組成物および圧電素子 |
PCT/JP2019/011577 WO2019181977A1 (ja) | 2018-03-23 | 2019-03-19 | 圧電組成物および圧電素子 |
DE112019001519.2T DE112019001519B4 (de) | 2018-03-23 | 2019-03-19 | Piezoelektrische zusammensetzung und piezoelektrisches element |
US17/040,310 US11271147B2 (en) | 2018-03-23 | 2019-03-19 | Piezoelectric composition and piezoelectric element |
CN201980021115.XA CN111902953B (zh) | 2018-03-23 | 2019-03-19 | 压电组合物和压电元件 |
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JP2006028001A (ja) | 2004-06-17 | 2006-02-02 | Toyota Central Res & Dev Lab Inc | 結晶配向セラミックス、及びその製造方法 |
WO2006117990A1 (ja) | 2005-04-28 | 2006-11-09 | Murata Manufacturing Co., Ltd. | 圧電体磁器組成物、及び該圧電体磁器組成物の製造方法、並びに圧電セラミック電子部品 |
JP2009120443A (ja) | 2007-11-14 | 2009-06-04 | Ngk Insulators Ltd | (Li,Na,K)(Nb,Ta)O3系圧電材料、及びその製造方法 |
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CN110282972B (zh) * | 2018-03-19 | 2023-07-25 | Tdk株式会社 | 压电组合物以及压电元件 |
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JP2000313664A (ja) | 1999-02-24 | 2000-11-14 | Toyota Central Res & Dev Lab Inc | アルカリ金属含有ニオブ酸化物系圧電材料組成物 |
JP2006028001A (ja) | 2004-06-17 | 2006-02-02 | Toyota Central Res & Dev Lab Inc | 結晶配向セラミックス、及びその製造方法 |
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US11271147B2 (en) | 2022-03-08 |
CN111902953A (zh) | 2020-11-06 |
US20210091298A1 (en) | 2021-03-25 |
DE112019001519B4 (de) | 2023-07-27 |
CN111902953B (zh) | 2023-09-26 |
DE112019001519T5 (de) | 2020-12-10 |
JP2019169630A (ja) | 2019-10-03 |
WO2019181977A1 (ja) | 2019-09-26 |
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