Microscopic distribution of metal dopants and anion vacancies in Fe-doped BaTiO3-δ single crystals

被引：20

作者：

Chakraborty, Tanushree ^{[1
]}

Meneghini, Carlo ^{[2
]}

Aquilanti, Giuliana ^{[3
]}

Ray, Sugata ^{[1
,4
]}

机构：

[1] Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India

[2] Univ Roma Tre, Dipartimento Sci, I-00146 Rome, Italy

[3] Elettra Sincrotrone Trieste SCpA, I-34149 Trieste, Italy

[4] Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 23期

关键词：

FINE-STRUCTURE; MAGNETISM;

D O I：

10.1088/0953-8984/25/23/236002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A detailed microscopic structural study on two single crystalline dilute magnetic oxides, BaTi0.95Fe0.05O3-delta with and without perceptible delta, has been carried out. Although it has been reported earlier that varying delta significantly affects high temperature ferromagnetism, the real distribution/redistribution of vacancies and dopant Fe ions inside the 6H hexagonal structure was never probed. This study reveals that oxygen vacancies reduce the dopant Fe3+ ions to Fe2+ and mostly accumulate around these Fe2+ ions. Another distinct trend is the tendency of the dopant Fe ions to get closer instead of being distributed randomly, thereby creating Fe-2(2+) O9-delta' like dimers within the 6H hexagonal unit cell. This experimental observation definitively confirms previous hypotheses based on theoretical models.

引用

页数：7

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