Low temperature structural phase transition in hafnium and zirconium tetrafluoride trihydrates |
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| Affiliation: | 1. IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal;2. CFNUL-Centro de Física Nuclear, Universidade de Lisboa, Av. Prof. Gama Pinto, 2, 1649-003 Lisboa, Portugal;1. Center for Instrumental Analysis, University of Yamanashi, Takeda, Kofu, Yamanashi 400-8551, Japan;2. Graduate School of Medicine and Engineering, University of Yamanashi, Takeda, Kofu, Yamanashi 400-8511, Japan;3. Graduate School of Engineering, Saga University, 1 Honjo-machi, Saga, 840-8502, Japan;4. National Institute of Advanced Industrial Science and Technology, 4-5-1 Nigatake, Sendai, Miyagi 983-8551, Japan;1. Department of Electrical Engineering and Electronics, Don State Technical University, 1 Gagarin Square, 344010 Rostov-on-Don, Russian Federation;2. Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanivsky Street, UA-03142 Kyiv, Ukraine;3. Laboratory of Crystal Growth, Institute of Geology and Mineralogy, SB RAS, 630090 Novosibirsk, Russian Federation;4. Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, 630090 Novosibirsk, Russian Federation;1. V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, Prospekt Nauky, 03028 Kyiv, Ukraine;2. Nanomedtech LLC, 68, Gorky Street, 03680 Kyiv, Ukraine;3. School of Engineering and Applied Science, Aston University, Aston Triangle, Birmingham, B4 7ET, UK;4. Institute of Innovative Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan;1. Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey;2. Department of Physics, Middle East Technical University, 06800 Ankara, Turkey;3. Virtual International Scientific Research Centre, Baku State University, 1148 Baku, Azerbaijan |
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| Abstract: | From time-differential perturbed angular correlation (TDPAC) measurements, the monoclinic and triclinic crystal structures in hafnium and zirconium tetrafluoride trihydrates are found to be present simultaneously in both the compounds. From previous TDPAC and XRD investigations, a monoclinic crystal structure for HfF4·3H2O but, for its analogues zirconium compound, a triclinic structure was reported. Contrary to earlier reports, the triclinic fraction in HfF4·3H2O is found to be maximum (80%) at room temperature. In fact, the triclinic crystal structure of HfF4·3H2O is reported here which was not known prior to this report. In ZrF4·3H2O, a strong signal (80–90%) for the triclinic structure is found at room temperature while the monoclinic fraction appears as a weak signal (10–15%). Structural phase transitions in these trihydrate compounds have been observed in the temperature range 298–333 K. |
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| Keywords: | A. Inorganic compounds B. Chemical synthesis D. Crystal structure D. Phase transitions |
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