@article{oai:sucra.repo.nii.ac.jp:00012981,
 author = {小林, 秀彦 and 下坂, 建一 and 三田村, 孝},
 issue = {1172},
 journal = {日本セラミックス協会学術論文誌},
 month = {},
 note = {http://ci.nii.ac.jp/naid/110002290337/ | http://ci.nii.ac.jp/naid/110002290337/, Preparation conditions and formation process of HfB_2 fine powders from HfO_2, amorphous B and Mg under an argon flow were examined. Fine powders of single phase HfB_2 were prepared by heating powder mixtures of HfO_2: amorphous B: and Mg in molar ratios of 1:2:7-10 at 800℃ for 1 h. The HfB_2 powders had particle sizes of 0.03-0.3μm. The formation process of HfB_2 was composed of the following reactions: (1)650℃〜: HfO_2+2Mg→α-Hf+2MgO, (2)550-750℃: Mg+2B→MgB_2, (3)750℃〜: MgB_2→Mg+2B, (4)800℃〜: α-Hf+2B→HfB_2 and (5)850℃〜: 2MgB_2→MgB_4+Mg. MgB_2 did not interfere the formation of HfB_2 because it decomposed above 750℃, whereas MgB_4 interfered the boridation of α-Hf above 850℃ because it is thermally stable. For the preparation of single phase HfB_2 powders, it is most important to suppress the formation of MgB_4 by controlling the reaction temperature below 850℃., rights: 社団法人日本セラミックス協会
rights: 本文データは学協会の許諾に基づきCiNiiから複製したものである
relation: IsVersionOf: http://ci.nii.ac.jp/naid/110002290337/, text, application/pdf},
 pages = {456--460},
 title = {Mg還元テルミット法によるHfB_2の微粉末合成と生成過程},
 volume = {101},
 year = {1993},
 yomi = {コバヤシ, ヒデヒコ and シモサカ, ケンンイチ and ミタムラ, タカシ}
}