JP5259741B2 - Bi−Ge−O系焼結体スパッタリングターゲット及びその製造方法並びに光記録媒体 - Google Patents
Bi−Ge−O系焼結体スパッタリングターゲット及びその製造方法並びに光記録媒体 Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims description 32
- 238000005477 sputtering target Methods 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000000843 powder Substances 0.000 claims description 51
- 229910005793 GeO 2 Inorganic materials 0.000 claims description 33
- 239000012071 phase Substances 0.000 claims description 27
- 238000004544 sputter deposition Methods 0.000 claims description 27
- 230000035939 shock Effects 0.000 claims description 23
- 229910052797 bismuth Inorganic materials 0.000 claims description 19
- 229910052732 germanium Inorganic materials 0.000 claims description 17
- 238000005452 bending Methods 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 12
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 9
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 8
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000007858 starting material Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 4
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000003746 solid phase reaction Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 23
- 239000010408 film Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 239000010409 thin film Substances 0.000 description 9
- 229910000416 bismuth oxide Inorganic materials 0.000 description 7
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000007792 addition Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Description
光ディスクは高密度化への要求に対応する為、多層化による高密度化が行われている。青色LDを用いる光ディスクにおいても同様に、高密度記録用の光記録媒体の開発が行われている。
1)ビスマス(Bi)、ゲルマニウム(Ge)、酸素(O)からなる焼結体ターゲットであって、BiとGeの原子数比が、0.57<(Bi/(Bi+Ge))<0.92であり、結晶相としてBi12GeO20、Bi4Ge3O12、GeO2の3相を含むことを特徴とするBi−Ge−O系焼結体スパッタリングターゲット
2)ターゲットに200°C、30分の加熱による熱衝撃を与えた場合の、該熱衝撃前後の平均曲げ強度低下率が50%以下であることを特徴とする上記1)記載の焼結体スパッタリングターゲット
3)上記1)又は2)記載のターゲットを用いてスパッタリングすることにより成膜した光記録媒体、を提供する。
4)GeO2粉0.03〜89mol%、Bi12GeO20粉11〜99.97mol%を出発原料とし、これらの原料をBiとGeの原子数比が、0.57<(Bi/(Bi+Ge))<0.92となるように混合した後、600〜840°C、加圧力150〜400kg/cm2でホットプレスすることにより、Bi12GeO20、Bi4Ge3O12及びGeO2の3相の結晶相を含む焼結体を作製することを特徴とするBi−Ge−O系焼結体スパッタリングターゲットの製造方法
5)GeO2粉14.3mol%とBi2O3粉85.7mol%を混合後、固相反応させてBi12GeO20粉末を作製することを特徴とする上記4)記載のBi−Ge−O系焼結体スパッタリングターゲットの製造方法
6)平均結晶粒径が10〜50μmである酸化ゲルマニウムの焼結原料粉末を用いて焼結することを特徴とする上記4)又は5)記載のBi−Ge−O系焼結体スパッタリングターゲットの製造方法、を提供する。
ところが、Bi12GeO20とBi4Ge3O12は熱膨張係数差が大きいため、熱衝撃に極めて弱くなり、高パワーでのスパッタリング成膜時に割れが発生するという問題が発生する。
また、割れや亀裂が原因となるパーティクルの発生が著しく減少し、安定した高品質の薄膜の作製が可能となり、記録ビットのエラー発生のない、そして高記録密度が達成できる光記録媒体の製造が可能となるという効果が得られた。
また、本発明のBi−Ge−O系焼結体スパッタリングターゲットは、ターゲットに200°C、30分の加熱による熱衝撃を与えた場合の、該熱衝撃前後の平均曲げ強度低下率が50%以下となった。
従来品のBi12GeO20とBi4Ge3O12の2相共存組成のターゲットの場合には、前記熱衝撃前後の平均曲げ強度低下率が80%を超えているのに対して、大きな改善効果があった。これによって、ターゲットの熱衝撃による割れを抑制する上で、ターゲットの特性を直接的に評価できるものである。
上記のターゲットを用いてスパッタリングすることにより成膜した光記録媒体は、安定した高品質の薄膜であり、記録ビットのエラー発生のない光記録媒体を得ることができる
純度3N(99.9%)の酸化ビスマスと酸化ゲルマニウムの粉末を出発原料とすると共に、予め平均粒径が12μmのGeO2粉と平均粒径が20μmのBi12GeO20粉を準備し、これらをそれぞれ、BiとGeの原子数比が、0.67となるように、GeO2粉83.3mol%、Bi12GeO20粉16.7mol%を調合した後、混合し、さらに混合後の粉末をカーボン製ダイスに充填し、温度700°C、圧力250kg/cm2の条件でホットプレスを行った。
なお、本実施例において、GeO2粉、Bi12GeO20粉を上記のモル比となるように添加しているが、これらの添加の総合比は、GeO250.0mol%、Bi2O350.0mol%に一致する配合比になるように調整した。
この焼結体の、X線回折測定により、Bi12GeO20、Bi4Ge3O12、GeO2の3相構造であることを確認した。この結果を表1に示す。
この結果、本願発明の実施例は、割れの発生がなく、生産効率を上げることができ、かつ安定して高品質の薄膜の作製が可能であり、記録ビットのエラー発生のない光記録媒体を得ることができるという優れた効果を有する良好なターゲットであった。
純度3N(99.9%)の酸化ビスマスと酸化ゲルマニウムの粉末を出発原料とすると共に、予め平均粒径が12μmのGeO2粉と平均粒径が20μmのBi12GeO20粉を準備し、これらをそれぞれ、BiとGeの原子数比が、0.80となるように、GeO2粉66.7mol%、Bi12GeO20粉33.3mol%を調合した後、混合し、さらに混合後の粉末をカーボン製ダイスに充填し、温度700°C、圧力250kg/cm2の条件でホットプレスを行った。
なお、本実施例において、GeO2粉、Bi12GeO20粉を上記のモル比となるように添加しているが、これらの添加の総合比は、GeO233.3mol%、Bi2O366.7mol%に一致する配合比になるように調整した。
この焼結体の、X線回折測定により、Bi12GeO20、Bi4Ge3O12、GeO2の3相構造であることを確認した。この結果を表1に示す。
この結果、本願発明の実施例は、割れの発生がなく、生産効率を上げることができ、かつ安定して高品質の薄膜の作製が可能であり、記録ビットのエラー発生のない光記録媒体を得ることができるという優れた効果を有する良好なターゲットであった。
純度3N(99.9%)の酸化ビスマスと酸化ゲルマニウムの粉末を出発原料とし、これらをそれぞれ、BiとGeの原子数比が、0.67となるように、平均粒径が5μmのGeO2粉50.0mol%、平均粒径が20μmのBi2O3粉50.0mol%を調合した後、混合し、さらに混合後の粉末をカーボン製ダイスに充填し、温度730°C、圧力250kg/cm2の条件でホットプレスを行った。
この焼結体のX線回折測定により、ターゲットの結晶相がBi12GeO20、Bi4Ge3O12の2相構造であることを確認した。
この結果、平均曲げ強度の低下率が82%となった。このターゲットを用いて、2kWのパワーでスパッタリングした。その結果、スパッタリング中、ターゲットに割れが発生した。また、実施例に較べて、パーティクルの発生が著しく増加した。これはスパッタリング中のターゲットの割れが原因と考えられる。
純度3N(99.9%)の酸化ビスマスと酸化ゲルマニウムの粉末を出発原料とすると共に、予め平均粒径が5μmのGeO2粉と平均粒径が20μmのBi12GeO20粉を準備し、これらをそれぞれ、BiとGeの原子数比が、0.67となるように、GeO2粉83.3mol%、Bi12GeO20粉16.7mol%を調合した後、混合し、さらに混合後の粉末をカーボン製ダイスに充填し、温度700°C、圧力250kg/cm2の条件でホットプレスを行った。
なお、本実施例において、GeO2粉、Bi12GeO20粉を上記のモル比となるように添加しているが、これらの添加の総合比は、GeO250.0mol%、Bi2O350.0mol%に一致する配合比になるように調整した。
この焼結体の、X線回折測定により、GeOは全量が反応し、Bi12GeO20、Bi4Ge3O12の2相構造であることを確認した。
この結果、平均曲げ強度の低下率が80%となった。このターゲットを用いて、2kWのパワーでスパッタリングした。その結果、スパッタリング中、ターゲットに割れが発生した。また、実施例に較べて、パーティクルの発生が著しく増加した。これはスパッタリング中のターゲットの割れが原因と考えられる。
Claims (6)
- ビスマス(Bi)、ゲルマニウム(Ge)、酸素(O)からなる焼結体ターゲットであって、BiとGeの原子数比が、0.57<(Bi/(Bi+Ge))<0.92であり、結晶相としてBi12GeO20、Bi4Ge3O12、GeO2の3相を含むことを特徴とするBi−Ge−O系焼結体スパッタリングターゲット。
- ターゲットに200°C、30分の加熱による熱衝撃を与えた場合の、該熱衝撃前後の平均曲げ強度低下率が50%以下であることを特徴とする請求項1記載の焼結体スパッタリングターゲット。
- 請求項1又は2記載のターゲットを用いてスパッタリングすることにより成膜した光記録媒体。
- GeO2粉0.03〜89mol%、Bi12GeO20粉11〜99.97mol%を出発原料とし、これらの原料をBiとGeの原子数比が、0.57<(Bi/(Bi+Ge))<0.92となるように混合した後、600〜840°C、加圧力150〜400kg/cm2でホットプレスすることにより、Bi12GeO20、Bi4Ge3O12及びGeO2の3相の結晶相を含む焼結体を作製することを特徴とするBi−Ge−O系焼結体スパッタリングターゲットの製造方法。
- GeO2粉14.3mol%とBi2O3粉85.7mol%を混合後、固相反応させてBi12GeO20粉末を作製することを特徴とする請求項4記載のBi−Ge−O系焼結体スパッタリングターゲットの製造方法。
- 平均結晶粒径が10〜50μmである酸化ゲルマニウムの焼結原料粉末を用いて焼結することを特徴とする請求項4又は5記載のBi−Ge−O系焼結体スパッタリングターゲットの製造方法。
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