A TEM study of Ni ordering in the Ni6Se5−xTex, 0<x<∼1.7, system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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A TEM study of Ni ordering in the Ni₆Se_5−xTe_x, 0<x<∼1.7, system

Authors:	Ray L Withers Yun Liu

Institution:	^a Research School of Chemistry, Australian National University, GPO Box 4, Canberra ACT 0200, Australia ^b Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia

Abstract:	The Ni₆Se_5−xTe_x, 0<x<∼1.7, system has been carefully investigated via electron diffraction and TEM imaging. They reveal a somewhat disordered modulated superstructure phase arising from Ni ion ordering within an essentially well-defined chalcogen sub-structure. As x, and the underlying parent substructure cell dimensions increase, the incommensurate primary modulation wave-vector q characteristic of this Ni ion ordering quickly swings from close to for x=0 towards for x?0.5. A lock-in to would formally transform the underlying parent Bmmb (a_p, b_p, c_p) structure into a P1a1 (a_s=2a_p, b_s=b_p, c_s=a_p+c_p) superstructure phase.

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