Magnetic transitions in exotic perovskites stabilized by chemical and physical pressure

Yalin Ma, Maxim S. Molokeev, Chuanhui Zhu, Shuang Zhao, Yifeng Han, Meixia Wu, Sizhan Liu, Trevor A. Tyson, Mark Croft, Man Rong Li

Research output: Contribution to journalArticle

Abstract

Exotic perovskites significantly enrich materials for multiferroic and magnetoelectric applications. However, their design and synthesis is a challenge due to the mostly required recipe conditions at extremely high pressure. Herein, we presented the Ca2-xMnxMnTaO6 (0 ≤ x ≤ 1.0) solid solutions stabilized by chemical pressure assisted with intermediate physical pressure up to 7 GPa. The incorporation of Mn2+ into the A-site neither drives any cationic ordering nor modifies the orthorhombic Pbnm structure, namely written as (Ca1-x/2Mnx/2)(Mn1/2Ta1/2)O3 with disordered A and B site cationic arrangements. The increment of x is accompanied by a ferromagnetic to antiferromagnetic transition around x = 0.2, which is attributed to the double-exchange interactions between A-site Mn2+ and B-site Mn3+. Partial charge disproportionation of the B-site Mn3+ into Mn2+ and Mn4+ occurs for x above 0.8 samples as manifested by X-ray spectrum and magnetic behaviors. The coexistence of B-site Mn3+ (Jahn-Teller distortion ion) and B′-site Ta5+ (second-order Jahn-Teller distortion ion) could be energetically responsible for the absence of A-site columnar ordering as observed in other quadruple perovskites with half of the A-sites occupied by small transition-metal cations. These exceptional findings indicate that exotic perovskites can be successfully stabilized at chemical and intermediate physical pressure, and the presence of Jahn-Teller distortion cations at the same lattice should be avoided to enable cationic ordering.

Original languageEnglish (US)
Pages (from-to)5082-5091
Number of pages10
JournalJournal of Materials Chemistry C
Volume8
Issue number15
DOIs
StatePublished - Apr 21 2020

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Chemistry(all)

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