The polymorphism of CsThF5 |
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| Institution: | 1. Department of Chemistry, Clemson University, 485 H.L. Hunter Laboratories, Clemson, SC 29634-0973, USA;2. Department of Materials Science and Engineering, Advanced Research Materials Laboratory, Clemson University, Pendleton, SC 29670, USA;1. College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China;2. School of Electrical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China;3. School of Energy and Environment, Anhui University of Technology, Ma''anshan 243002, China;4. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;1. Product Development Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;2. Radiochemistry and Isotope Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;1. Aalto University, Department of Materials Science and Engineering, 02150, Espoo, Finland;2. Laboratorio MDM, IMM CNR, Via C. Olivetti 2, 20864, Agrate Brianza, MB, Italy;3. STMicroelectronics, Via C. Olivetti 2, 20864, Agrate Brianza, MB, Italy;4. Università degli studi di Milano Bicocca, Dipartimento di Scienza dei Materiali, 20126, Milano, Italy;1. Nanoscale Sciences Department, Sandia National Laboratories, P.O. Box 5800, MS-1415, Albuquerque, NM 87185, United States;2. Center for Integrated Nanotechnology, Sandia National Laboratories, P.O. Box 5800, MS-1315, Albuquerque, NM 87185, United States;3. Department of Hot Cells and Gamma Facilities, Sandia National Laboratories, P.O. Box 5800, MS-1143, Albuquerque, NM 87185, United States;1. Department of Metallurgical & Materials Engineering, The University of Alabama, 301 7th Avenue 116 Houser Hall, Tuscaloosa, AL, 35487-0202, United States;2. Exothermics Inc. 14 Columbia Drive, Amherst, NH 03031, United States;3. Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, 80523, United States;1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400044, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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| Abstract: | Three new polymorphs of cesium thorium pentafluoride, CsThF5, have been synthesized hydrothermally and structurally characterized. Of the structures of three polymorphs of CsThF5 one is described in space group P4/nmm with a = 5.7358(8) and c = 7.4048(15) and two in the space group P21/c: one with a = 8.3600(17), b = 7.5780(15), c = 8.9912(18), β = 116.69(3) and the other with a = 8.4196(17), b = 14.645(3), c = 8.5017(17), β = 102.67(3). Comparison of these materials was made based on their structures and synthesis conditions. The formation of these species and other previously reported metal fluoride species in hydrothermal fluids appears to be dependent upon the concentration of the alkali fluoride mineralizer, pressure, temperature, and reaction time. Differential scanning calorimetry (DSC) studies show that all of the different phases of cesium thorium fluoride transition into the same monoclinic phase of CsThF5 and eventually into the orthorhombic phase of CsTh3F13. |
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