中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Crystal and Magnetic Structures and Physical Properties of a New Pyroxene NaMnGe2O6 Synthesized under High Pressure

文献类型:期刊论文

作者Cheng, JG ; Tian, W ; Zhou, JS ; Lynch, VM ; Steinfink, H ; Manthiram, A ; May, AF ; Garlea, VO ; Neuefeind, JC ; Yan, JQ
刊名JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
出版日期2013
卷号135期号:7页码:2776
ISSN号0002-7863
通讯作者Zhou, JS (reprint author), Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA.
中文摘要A new pyroxene compound, NaMnGe2O6, has been synthesized at 3 GPa and 800 degrees C and fully characterized by X-ray single-crystal diffraction, neutron powder diffraction, and measurements of magnetization and specific heat. NaMnGe2O6 crystallizes into a monoclinic C2/c structure with unit-cell parameters a = 9.859(2) angstrom, b = 8.7507(18) angstrom, c = 5.5724(11) angstrom, and beta = 105.64(3)degrees at 153 K.A cooperative Jahn-Teller distortion is formed by an ordering of the longest Mn-O bonds between two neighboring octahedra along the chain direction. This feature distinguishes NaMnGe2O6 from other pyroxene compounds without Jahn-Teller active cations and suggests that the Jahn-Teller distortion competes with the intrinsic local distortion in the pyroxene structure. No orbital order-disorder transition has been found up to 750 K. Like other alkali-metal pyroxenes with S > 1/2, NaMnGe2O6 (S = 2) was found to undergo a long-range antiferromagnetic (AF) ordering at T-N = 7 K due to intrachain and interchain exchange interactions. Due to the peculiar structural features and the corresponding magnetic coupling, the weak AF spin ordering gives way to a ferromagnetic-like state at a sufficiently high magnetic field. Specific-heat measurements demonstrated that a large portion of the magnetic entropy, >60%, has been removed above T-N as a result of strong spin correlations within the quasi-one-dimensional Mn3*-spin chains. The Reitveld refinement of neutron powder diffraction data gives a commensurate magnetic structure defined by k = [0 0 0.5] with Mn moments aligned mainly along the c-axis with a small component along both a- and b-axes.
资助信息National Science Foundation Materials Interdisciplinary Research Team (MIRT) [DMR 1122603]; U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division; Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
语种英语
公开日期2014-01-16
源URL[http://ir.iphy.ac.cn/handle/311004/56856]  
专题物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式
GB/T 7714
Cheng, JG,Tian, W,Zhou, JS,et al. Crystal and Magnetic Structures and Physical Properties of a New Pyroxene NaMnGe2O6 Synthesized under High Pressure[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2013,135(7):2776.
APA Cheng, JG.,Tian, W.,Zhou, JS.,Lynch, VM.,Steinfink, H.,...&Yan, JQ.(2013).Crystal and Magnetic Structures and Physical Properties of a New Pyroxene NaMnGe2O6 Synthesized under High Pressure.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,135(7),2776.
MLA Cheng, JG,et al."Crystal and Magnetic Structures and Physical Properties of a New Pyroxene NaMnGe2O6 Synthesized under High Pressure".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 135.7(2013):2776.

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来源:物理研究所

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