Low-Temperature Cationic Rearrangement in a Bulk Metal Oxide

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• 作者：Dr. Man-Rong Li ; Maria Retuerto ; Prof. Peter W. Stephens ; Prof. Mark Croft ; Dr. Denis Sheptyakov ; Vladimir Pomjakushin ; Zheng Deng ; Dr. Hirofumi Akamatsu ; Venkatraman Gopalan ; Dr. Javier Sá ; nchez-Bení ; tez ; Felix O. Saouma ; Prof. Joon I. Jang ; Prof. David Walker and Prof. Martha Greenblatt
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 16, 2016
• 年：2016
• 卷：55
• 期：34
• 页码：9862-9867
• 全文大小：4631K
• ISSN：1521-3773

文摘

Cationic rearrangement is a compelling strategy for producing desirable physical properties by atomic-scale manipulation. However, activating ionic diffusion typically requires high temperature, and in some cases also high pressure in bulk oxide materials. Herein, we present the cationic rearrangement in bulk Mn₂FeMoO₆ at unparalleled low temperatures of 150–300 ^oC. The irreversible ionic motion at ambient pressure, as evidenced by real-time powder synchrotron X-ray and neutron diffraction, and second harmonic generation, leads to a transition from a Ni₃TeO₆–type to an ordered-ilmenite structure, and dramatic changes of the electrical and magnetic properties. This work demonstrates a remarkable cationic rearrangement, with corresponding large changes in the physical properties in a bulk oxide at unprecedented low temperatures.