Structural phase transitions and their influence on Cu+ mobility in superionic ferroelastic Cu6PS5I single crystals

• Autorzy: Gągor A. , Pietraszko A. , Drozd M. , Połomska M. , Kaynts D.
• Konferencja: IX National Conference on Fast Ion Conductors , Wrocław-Borowice , 9-12 December 2004
• Języki publikacji: EN

Abstrakty

EN

The structural origin of Cu+ ion conductivity in Cu6PS5I single crystals is described in terms of structural phase transitions studied by X-ray diffraction, polarized light microscopy and calorimetric measurements. Below the phase transition temperature at Tc = (144-169) K, Cu6PS5I belongs to the monoclinic, ferroelastic phase, with the space group Cc. Above Tc, the crystal changes its symmetry to a cubic superstructure, with the space group F43c (a' = 19.528); finally, at 274 K, the disordering of Cu+ ions increases to the symmetry F43m (a = 9.794). The phase transition at 274 K coincides well with a strong anomaly in electrical conductivity observed on the Arrhenius plot. Diffusion paths for Cu+ ions are evidenced by means of atomic displacement factors and a split model. The influence of copper stoichiometry on Tc is also discu

Słowa kluczowe

EN

fast-ion conductor; structural phase transition; X-ray diffraction; argyrodite

PL

przejścia fazowe; przemiana fazowa; dyfrakcja promieniowania rentgenowskiego; argyrodit

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2006
• Tom: Vol. 24, No. 1
• Strony: 237--243
• Opis fizyczny: Bibliogr. 13 poz.

Twórcy

autor

Gągor A.

autor

Pietraszko A.

autor

Drozd M.

autor

Połomska M.

autor

Kaynts D.

• Institute of Low Temperatures and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-590 Wrocław,

Bibliografia

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