Pressure-temperature phase diagram and thermoelastic behavior of manganese fluoride up to 13.1 GPa and 700 K | |
Zhilin Ye; Bo Li; Wei Chen; Shijie Huang; Jingui Xu; Dawei Fan | |
刊名 | Materials Research Express |
2019 | |
页码 | 1-15 |
关键词 | Manganese Fluoride (Mnf2) structural Phase Transition High Temperature And High Pressure synchrotron-based X-ray Diffraction equation Of State diamond Anvil Cell |
英文摘要 | Studying manganese fluoride (MnF2) under high-pressure and high-temperature (HP-HT) conditions is of great significance for understanding its important magnetic and piezomagnetic properties. The structural evolution and thermoelastic behavior of MnF2were studied at HP-HT conditions up to ∼13.1 GPa and∼700 K based on in situ synchrotron angle dispersive powder x-ray diffraction (XRD) combined with diamond anvil cell (DAC). Four phases of MnF2 are successfully observed through the pressure-temperature (P-T)range of the experiment. The structural phase transitions are with the following sequence: rutile-type (P42/mnm) → α-PbO2-type (Pbcn) → P42m → ZrO2-type (Pbcm) → SrI2-type (Pbca) at HP-HT conditions, where theα-PbO2-type (Pbcn) and the P42m structures are observed upon decompression. A phase diagram of MnF2 is presented in this study. In addition, the bulk modulus for the SrI2-type structure (Pbca) of MnF2 is 84 (3)GPa when fixed K0′ = 4. Moreover, we also obtain (∂K/∂T)P = −0.012 (7)GPaK−1 , and the volumetric thermal expansion coefficient α0 = 3.8 (7) × 10−5 K−1 at 300 K. Furthermore, the thermal expansion coefficients for the rutile-type structure (P42/mnm) of MnF2 by fitting the temperature-volume data to the Fei-type thermal equation of state (EoS) are also obtained. The volumetric thermal expansion coefficient of MnF2 is 0.87 × 10−5 K−1 , and its axial thermal expansivities are αa0 = 0.13 × 10−5 K−1 and αc0 = 0.64 × 10−5 K−1 along the a-axis and c-axis, respectively. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/10557] |
专题 | 地球化学研究所_地球内部物质高温高压实验室 |
作者单位 | 1.Guizhou Polytechnic of Construction, Guiyang 551400, People’s Republic of China 2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, People’s Republic of China |
推荐引用方式 GB/T 7714 | Zhilin Ye;Bo Li;Wei Chen;Shijie Huang;Jingui Xu;Dawei Fan. Pressure-temperature phase diagram and thermoelastic behavior of manganese fluoride up to 13.1 GPa and 700 K[J]. Materials Research Express,2019:1-15. |
APA | Zhilin Ye;Bo Li;Wei Chen;Shijie Huang;Jingui Xu;Dawei Fan.(2019).Pressure-temperature phase diagram and thermoelastic behavior of manganese fluoride up to 13.1 GPa and 700 K.Materials Research Express,1-15. |
MLA | Zhilin Ye;Bo Li;Wei Chen;Shijie Huang;Jingui Xu;Dawei Fan."Pressure-temperature phase diagram and thermoelastic behavior of manganese fluoride up to 13.1 GPa and 700 K".Materials Research Express (2019):1-15. |
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