Phase transition in the ternary fluorides Li3Alf6 and Li3CrF6 |
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| Authors: | M Hamadène J Grannec A Guehria J Ravez |
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| Institution: | 1. Laboratoire de Cristallographie Appliquée , Institut de Chmie , U.S.T.H.B. BP 32, El ALIA, BEZ, Alger, 16111, Algerié;2. Institut de Chimie de la Matière Condensée de Bordeaux Avenue du Dr. A. Schweitzer , 33608, Pessac Cedex, France |
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| Abstract: | The phase transitions of two ternary fluorides have been reinvestigated by thermal and X-ray diffraction analyses. Four phase transitions have been detected at T 1 = 483 ± 5 K, T 2 = 548 ± 5 K, T 3 = 765 ± 5 K and T 4 = 867 ± 5 K for Li3AlF6. Only two transformations occurred at T 1 = 550 ± 5 K and T 2 = 660 ± 10 K for Li3CrF6. Dielectric and optical measurements performed respectively on ceramics and single crystals revealed a ferroelectric behaviour coupling partially with ferroelastic coupling for the two investigated fluorides. |
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| Keywords: | Structural phase transition Ferroelectricity Ferroelasticity |
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