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
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| 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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