中国物理B ›› 2014, Vol. 23 ›› Issue (1): 16102-016102.doi: 10.1088/1674-1056/23/1/016102

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Structural stability and electrical properties of AlB2-type MnB2 under high pressure

孟祥旭, 范靖, 包括, 李芳菲, 黄晓丽, 李岩, 田夫波, 段德芳, 靳锡联, 朱品文, 何志, 周强, 高春晓, 刘冰冰, 崔田   

  1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
  • 收稿日期:2013-03-15 修回日期:2013-09-06 出版日期:2013-11-12 发布日期:2013-11-12
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB808200), the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. IRT1132), the National Natural Science Foundation of China (Grant Nos. 51032001, 11074090, 10979001, and 51025206), and the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences (Grant No. DE-AC02-98CH10886).

Structural stability and electrical properties of AlB2-type MnB2 under high pressure

Meng Xiang-Xu (孟祥旭), Fan Jing (范靖), Bao Kuo (包括), Li Fang-Fei (李芳菲), Huang Xiao-Li (黄晓丽), Li Yan (李岩), Tian Fu-Bo (田夫波), Duan De-Fang (段德芳), Jin Xi-Lian (靳锡联), Zhu Pin-Wen (朱品文), He Zhi (何志), Zhou Qiang (周强), Gao Chun-Xiao (高春晓), Liu Bing-Bing (刘冰冰), Cui Tian (崔田)   

  1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
  • Received:2013-03-15 Revised:2013-09-06 Online:2013-11-12 Published:2013-11-12
  • Contact: Cui Tian E-mail:cuitian@jlu.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB808200), the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. IRT1132), the National Natural Science Foundation of China (Grant Nos. 51032001, 11074090, 10979001, and 51025206), and the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences (Grant No. DE-AC02-98CH10886).

摘要: The structural stability and electrical properties of AlB2-type MnB2 were studied based on high pressure angle-dispersive x-ray diffraction, in situ electrical resistivity measured in a diamond anvil cell (DAC) and first-principles calculations under high pressure. The x-ray diffraction results show that the structure of AlB2-type MnB2 remains stable up to 42.6 GPa. From the equation of state of MnB2, we obtained a bulk modulus value of 169.9±3.7 GPa with a fixed pressure derivative of 4, which indicates that AlB2-type MnB2 is a hard and incompressible material. The electrical resistance undergoes a transition at about 19.3 GPa, which can be explained by a transition of manganese 3d electrons from localization to delocalization under high pressure.

关键词: transition metal compounds, high pressure effects, structural stability, electrical properties

Abstract: The structural stability and electrical properties of AlB2-type MnB2 were studied based on high pressure angle-dispersive x-ray diffraction, in situ electrical resistivity measured in a diamond anvil cell (DAC) and first-principles calculations under high pressure. The x-ray diffraction results show that the structure of AlB2-type MnB2 remains stable up to 42.6 GPa. From the equation of state of MnB2, we obtained a bulk modulus value of 169.9±3.7 GPa with a fixed pressure derivative of 4, which indicates that AlB2-type MnB2 is a hard and incompressible material. The electrical resistance undergoes a transition at about 19.3 GPa, which can be explained by a transition of manganese 3d electrons from localization to delocalization under high pressure.

Key words: transition metal compounds, high pressure effects, structural stability, electrical properties

中图分类号:  (X-ray diffraction and scattering)

  • 61.05.C-
61.50.-f (Structure of bulk crystals) 61.50.Ks (Crystallographic aspects of phase transformations; pressure effects) 62.50.-p (High-pressure effects in solids and liquids)