JP2013216553A - Li含有燐酸化合物焼結体およびスパッタリングターゲット、並びにその製造方法 - Google Patents
Li含有燐酸化合物焼結体およびスパッタリングターゲット、並びにその製造方法 Download PDFInfo
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Abstract
【解決手段】本発明のLi含有燐酸化合物焼結体は、焼結体内部の断面1mm2領域中に50μm以上の欠陥がなく、平均結晶粒径が15μm以下であり、相対密度が85%以上であることに要旨を有する。
【選択図】なし
Description
原材料は、焼結体中の不純物相(Li4P2O7相)の低減、焼結体の高密度化、および焼結体を構成する結晶粒の微細化を図る観点からは平均粒径10μm以下、好ましくは8μm以下、更に好ましくは6μm以下の微細な原材料粉末を用いることが望ましい。一方、原材料粉末の平均粒径の下限は特に限定されないが、製造容易性の観点から、好ましくは1μm以上、より好ましくは3μm以上である。
更に本発明では上記原材料(Li3PO4粉末)をホットプレス炉に導入するまでの雰囲気を露点−30℃以下とする。詳細には、10μm以下の原材料粉末を製造した直後から雰囲気を露点−30℃以下とし、この雰囲気下で所定の黒鉛型に充填した後、ホットプレス炉に導入する。後記するようにホットプレス炉内は真空または不活性雰囲気であるため、炉内導入後は基本的に露点の制御が不要である。
上記原材料を焼結するにあたっては、まず、上記露点雰囲気下で上記原材料粉末を黒鉛型に充填する。黒鉛型への充填に当たっては、上記原材料粉末を、予備成形することなく直接、充填しても良いし、或いは、別の金型に一旦充填し、金型プレスで予備成形した後、黒鉛型に充填しても良い。後者の予備成形は、ホットプレス工程で所定の型にセットする際のハンドリング性を向上させる目的で行なわれるものであり、例えば、約0.5〜1.0tonf/cm2程度の加圧力を加えて予備成形体とすることが好ましい。
本発明のLi含有燐酸化合物焼結体は、(1)平均結晶粒径が15μm以下であること、(2)焼結体内部の断面に50μm以上の欠陥(空隙)がないこと、(3)相対密度が85%以上であること、また好ましくは(4)の粉末X線回折におけるLi3PO4相とLi4P2O7相の強度比(Li3PO4相/Li4P2O7相)が1.1以上である。
本発明には、上記焼結体を用いて得られるスパッタリングターゲット(Li含有燐酸化物焼結体ターゲット)も、本発明の範囲内に包含される。スパッタリングターゲットの製造方法は特に限定されず、通常用いられる方法を用いることができる。このようにして得られるスパッタリングターゲットも、上記Li含有燐酸化物焼結体と同様の特性(高い相対密度、空隙がない、微細な平均粒径、更に好ましくは低い不純物相)が得られる。
(Li含有燐酸化合物焼結体の作製)
原材料粉末としてLi3PO4粉末(純度:99.9%以上、平均粒径:表1記載の「粒径」)を用いた。
上記の原材料粉末を、直接、黒鉛型にセットし、表1に示す条件で、ホットプレスによる焼結を行ない、焼結体を得た。なお、表1のNo.1〜6、8は原料粉末を黒鉛型にセットし、ホットプレス炉に導入するまでは露点−30℃以下の雰囲気とした。またNo.1〜7は仮焼を行わずに焼結を行った。なお、No.7は露点を管理せず、露点−30℃超の雰囲気で黒鉛型にセットし、ホットスタンプ炉に導入した。No.8は原料粉末を黒鉛型にセットする前に大気中で750℃、3時間仮焼した。
上記各焼結体の相対密度を、アルキメデス法によって測定した。
上記各焼結体のLi3PO4相の(011)面のX線回折強度(P314)とLi4P2O7相の(1−11)面のX線回折強度(P427)を、CuKα線を用いた粉末X線回折により測定し、そのX線回折チャートから強度比(P314/P427)を求めた。
上記各焼結体の縦断面における任意の位置を走査型電子顕微鏡(SEM)で観察し、破面写真(SEM写真)より、切断法にて求めた。
上記各焼結体の縦断面のSEM写真の任意の1mm2領域において、欠陥の最大径をスケールから求め、目視にて最大径が50μm以上の欠陥の個数を測定した。
(スパッタリングターゲットの作製)
次に、上記No.1、No.3、No.5、No.7、No.8の焼結体を用いてスパッタリングターゲットを製造した。スパッタリングターゲットは、上記の各焼結体を機械加工して4インチφ×5mmt(t=厚み)に仕上げ、Cu製バッキングプレートにインジウムを用いてボンディングすることによって得た。No.1、No.3、No.5、No.7、No.8の上記焼結体を用いて得られたスパッタリングターゲットを、それぞれターゲットA〜Eと呼ぶ。
成膜条件:基板温度室温、RF放電パワー600W、スパッタガス圧3mTorr、スパッタガスとしてArと窒素の混合ガスを使用、成膜膜厚500nm
成膜手順:
各ターゲットを上記のスパッタ装置に装着し、ターゲットに対向する基板ステージ上にガラス基板を装着した。チャンバー内を真空ポンプで5×10-4Pa以下の真空に引き、基板ステージを加熱して基板温度を500℃に調整した。次に、マスフローを用いて上記のスパッタガスをチャンバー内に供給した。スパッタガス圧を3mTorrに調整した後、RF(交流)電源を用いてターゲットに高電圧を印加し、プラズマ放電させた。このときの放電パワーは600Wで行い、500nmの膜厚になるよう成膜を実施した。
Claims (5)
- Liを含む燐酸化合物焼結体であって、焼結体内部の断面1mm2領域中に50μm以上の欠陥がなく、平均結晶粒径が15μm以下であり、相対密度が85%以上であることを特徴とするLi含有燐酸化合物焼結体。
- 前記焼結体の粉末X線回折におけるLi3PO4相の(011)面の回折強度(P314)とLi4P2O7相の(1-11)面の回折強度(P427)の強度比が、P314/P427≧1.1である請求項1に記載のLi含有燐酸化合物焼結体。
- 請求項1または2に記載のLi含有燐酸化合物焼結体を用いて得られるスパッタリングターゲット。
- 請求項1または2に記載のLi含有燐酸化合物焼結体を製造する方法であって、
平均粒径10μm以下のLi含有燐酸化合物を含む原材料を、露点−30℃以下の雰囲気に維持しながら仮焼せずにホットプレス炉に導入した後、ホットプレス法によって焼結することを特徴とするLi含有燐酸化合物焼結体の製造方法。 - 前記ホットプレス法による焼結は、真空または不活性雰囲気下、ホットプレス温度700〜1000℃、圧力10〜100MPaで行うものである請求項4に記載の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012090543A JP5969799B2 (ja) | 2012-04-11 | 2012-04-11 | Li含有燐酸化合物焼結体およびスパッタリングターゲット、並びにその製造方法 |
KR1020147028209A KR101648656B1 (ko) | 2012-04-11 | 2013-04-10 | Li 함유 인산염 화합물 소결체 및 스퍼터링 타깃, 및 그 제조 방법 |
CN201380019399.1A CN104245623B (zh) | 2012-04-11 | 2013-04-10 | 含Li磷酸化合物烧结体和溅射靶,及其制造方法 |
EP13776280.3A EP2837610A4 (en) | 2012-04-11 | 2013-04-10 | SINTER BODY AND SPUTTER TARGET OF A LI-CONTAINING PHOSPHORIC ACID COMPOUND AND METHOD FOR PRODUCING THE SINTERED BODY FROM THE LI-CONTAINING PHOSPHORIC ACID CONNECTION |
US14/386,950 US9892891B2 (en) | 2012-04-11 | 2013-04-10 | Li-containing phosphoric-acid compound sintered body and sputtering target, and method for manufacturing said Li-containing phosphoric-acid compound sintered body |
PCT/JP2013/060777 WO2013154118A1 (ja) | 2012-04-11 | 2013-04-10 | Li含有燐酸化合物焼結体およびスパッタリングターゲット、並びにその製造方法 |
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EP2975156B1 (en) | 2013-03-13 | 2016-09-14 | Kobelco Research Institute , Inc. | Sintered body comprising licoo2 sputtering target, and production method for sintered body comprising licoo2 |
US9870902B2 (en) | 2013-04-30 | 2018-01-16 | Kobelco Research Institute, Inc. | Li-containing oxide target assembly |
JP2018024933A (ja) * | 2016-07-29 | 2018-02-15 | 三菱マテリアル株式会社 | Cu−Gaスパッタリングターゲット及びCu−Gaスパッタリングターゲットの製造方法 |
US20190334200A1 (en) * | 2016-11-09 | 2019-10-31 | Daiichi Kigenso Kagaku Kogyo Co., Ltd. | Lithium-containing zirconium phosphate, calcined powder of same, and method for producing sintered body |
CN114057480B (zh) * | 2021-11-17 | 2023-03-14 | 鄂尔多斯市紫荆创新研究院 | 用于制备薄膜锂电池的磷酸锂固态电解质靶材及制备方法 |
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US20150041312A1 (en) | 2015-02-12 |
JP5969799B2 (ja) | 2016-08-17 |
EP2837610A4 (en) | 2015-11-11 |
CN104245623B (zh) | 2017-05-24 |
WO2013154118A1 (ja) | 2013-10-17 |
KR101648656B1 (ko) | 2016-08-16 |
EP2837610A1 (en) | 2015-02-18 |
CN104245623A (zh) | 2014-12-24 |
KR20140143173A (ko) | 2014-12-15 |
US9892891B2 (en) | 2018-02-13 |
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