High-Pressure Synthesis of Two Polymorphic HgMnO3 Phases and Distinct Magnetism from 2D to 3D

被引：6

作者：

Zhou, Bowen ^{[1
,2
]}

Qin, Shijun ^{[1
,2
]}

Ma, Teng ^{[1
]}

Ye, Xubin ^{[1
,2
]}

Guo, Jia ^{[1
,2
]}

Yu, Xiaohui ^{[1
,2
]}

Lin, Hong-Ji ^{[4
]}

Chen, Chien-Te ^{[4
]}

Hu, Zhiwei ^{[5
]}

Tjeng, Liu-Hao ^{[5
]}

Zhou, Guanghui ^{[6
,7
]}

Dong, Cheng ^{[1
,2
]}

Long, Youwen ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

[3] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[5] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[6] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China

[7] Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat H, Changsha 410081, Peoples R China

来源：

INORGANIC CHEMISTRY | 2020年 / 59卷 / 06期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

PEROVSKITE; CRYSTAL; MAGNETORESISTANCE; TRANSFORMATION; FORMABILITY; MANGANATES; STABILITY; CAMNO3;

D O I：

10.1021/acs.inorgchem.9b03551

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

An ilmenite-like monoclinic phase of HgMnO3 with space group P2(1)/c was prepared using high-pressure and high-temperature methods at 18 GPa and 1473 K. The MnO6 octahedra form a two-dimensional (2D) network in the bc plane, leading to a long-range antiferromagnetic ordering with a low Neel temperature of TN similar to 32 K. As the synthesis pressure increases to 20 GPa, a new perovskite-like rhombohedral phase with space group R (3) over barc was found to occur. The rhombohedral phase exhibits a three-dimensional (3D) network for the MnO6 octahedra, giving rise to an antiferromagnetic ordering at TN similar to 60 K. X-ray absorption spectroscopy confirms the invariable Mn(4+ )charge state in these two polymorphic phases, in agreement with the Curie-Weiss and bond valence sum analysis. HgMnO3 provides an interesting example to study the magnetic properties from 2D to 3D by varying synthesis pressure.

引用

页码：3887 / 3893

页数：7

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