Hybrid improper ferroelectricity in Ruddlesden- Popper Ca3(Ti,Mn)2O7 ceramics

被引：88

作者：

Liu, X. Q. ^{[1
]}

Wu, J. W. ^{[1
]}

Shi, X. X. ^{[1
]}

Zhao, H. J. ^{[1
]}

Zhou, H. Y. ^{[1
]}

Qiu, R. H. ^{[2
]}

Zhang, W. Q. ^{[2
]}

Chen, X. M. ^{[1
]}

机构：

[1] Zhejiang Univ, Sch Mat Sci & Engn, Lab Dielect Mat, Hangzhou 310027, Peoples R China

[2] Shanghai Univ, Dept Phys, Shanghai 200444, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 20期

基金：

中国国家自然科学基金;

关键词：

POLARIZATION;

D O I：

10.1063/1.4921624

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The hybrid improper ferroelectricity (HIF) has been proposed as a promising way to create multiferroic materials with strong magnetoelectric coupling by the first-principle calculation, and the experimental evidences of HIF in Ruddlesden-Poper Ca-3(Ti1-xMnx)(2)O-7 (x = 0, 0.05, 0.1, and 0.15) ceramics have been shown in the present work. The room temperature ferroelectric hysteresis loops are observed in these ceramics, and a polar orthorhombic structure with two oxygen tilting modes has been confirmed by the X-ray powder diffraction. A first-order phase transition around 1100K in Ca3Ti2O7 was evidenced, and the temperatures of phase transitions decrease linearly with increasing of the contents of Mn4+ ions. Based on the result of first-principle calculations, the polarization should be reversed by switching through the mediated Amam phase in Ca3Ti2O7 ceramics. (C) 2015 AIP Publishing LLC.

引用

页数：4

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