Formation of metastable rare-earth iron garnet by rapid quenching

Autor:	Yamaguchi, Okie, Nagashio, Kosuke, Hibiya, Taketoshi, Kuribayashi, Kazuhiko
Jazyk:	japonština
Rok vydání:	2005
Předmět:	rare earth compound nucleation 希土類化合物 garnet 過冷却 supercooling containerless melt 無容器融液 核形成 stable perovskite 安定ガーネット 最大格子定数 浮遊 ガーネット ガス浮遊炉 levitation aerodynamic levitator maximum lattice constant 希土類鉄ガーネット rare-earth iron garnet
Zdroj:	宇宙利用シンポジウム 第21回 平成16年度 = Space Utilization Research: Proceedings of the Twenty-first Space Utilization Symposium. :13-16
Popis:	It is known that no rare earth iron garnet can form with a lattice parameter greater than 1.2540 nm which is Maximum Lattice Constant (MLC). In the present study, the melt with Nd(x)Sm(3-x)Fe5O12 composition was undercooled in an aerodynamic levitator and splat-quenched by copper anvils in order to obtain the metastable garnet phase with the lattice parameter greater than MLC (x = 0.38). X-Ray Diffraction (XRD) results indicated that the peak intensity of metastable garnet phase decreased with increasing the substitution x from 0.38 to 0.2 and finally disappeared at x = 2.2. The metastable garnet phase possessed the same composition as the starting composition. The maximum Nd substitution obtained using the splat quenching method was x = 2.0. Moreover, the amorphous phase was found in the central part of the sample, which was confirmed by micro focus XRD. 資料番号: AA0048095004
Databáze:	OpenAIRE
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