发明名称 |
Method for Producing High-Purity Lanthanum, High-Purity Lanthanum, Sputtering Target Formed from High-Purity Lanthanum, and Metal Gate Film Having Highy-Purity Lanthanum as Main Component |
摘要 |
The present invention addresses the problem of providing a technique capable of efficiently and stably providing a method for producing high-purity lanthanum, the method characterized in that: a crude lanthanum oxide starting material having a purity of 2N-5N, excluding gas components, is used; the material is subjected to molten salt electrolysis at a bath temperature of 450-700° C. to produce lanthanum crystals; the lanthanum crystals are subsequently desalted: and electron beam melting is then performed to remove volatile substances. The present invention also addresses the problem of providing a technique capable of efficiently and stably providing high-purity lanthanum, high-purity lanthanum itself, a sputtering target formed from high-purity material lanthanum; and a thin film for metal gates that has high purity lanthanum as the main component. |
申请公布号 |
US2013313659(A1) |
申请公布日期 |
2013.11.28 |
申请号 |
US201213980072 |
申请日期 |
2012.01.17 |
申请人 |
TAKAHATA MASAHIRO;SATOH KAZUYUKI;NARITA SATOYASU;GOHARA TAKESHI;JX NIPPON MINING & METALS CORPORATION |
发明人 |
TAKAHATA MASAHIRO;SATOH KAZUYUKI;NARITA SATOYASU;GOHARA TAKESHI |
分类号 |
H01L29/51;C25C3/34 |
主分类号 |
H01L29/51 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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