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Temperature dependent structural studies and phase transition behavior of K2Th(PO4)2
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- 자료유형학술지논문
- 저자명Bevara, Samatha,Rajeswari, B.,Patwe, S.J.,Krishna, P.S.R.,Shinde, A.B.,Achary, S.N.,Kadam, R.M.,Tyagi, A.K.
- 학회/출판사/기관명Elsevier Science B.V., Amsterdam.
- 출판년도2019
- 언어영어
- 학술지명/학위논문주기JOURNAL OF ALLOYS AND COMPOUNDS
- 발행사항Vol.783No.-[2019]_x000D_
- ISBN/ISSN
- 소개/요약Herein we report the details of crystal structure and phase transition behavior of a complex phosphate, K2Th(PO4)2 as observed from the variable temperature powder x-ray diffraction (XRD) and neutron diffraction (PND) studies. The ambient temperature monoclinic (P21/n) structure was observed to remain unchanged down to 6 K, while above 973 K, it transforms to a tetragonal (I41/amd) structure. This structural transition occurs with a volume discontinuity of about 13.4% and reverts back to monoclinic structure on cooling but with a large hysteresis in temperature (∼100 K). From the variation of unit cell parameters and structural differences as well as differential thermal analyses studies, the transition is concluded as a first order reconstructive type. The unit cell parameters of both structures gradually increases with increasing temperature but the coefficient of thermal expansion decreases appreciably after the transition (monoclinic, αV = 49.9 × 10⁻⁶/K in between 6 and 973 K; tetragonal, αV = 33.6 × 10⁻⁶/K, in between 673 and 1173 K). The details of crystal chemistry, phase transition and thermal expansion behaviors of K2Th(PO4)2 are explained, and compared with other isostructural compositions.
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