2026-04-29T13:17:06Z https://meral.edu.mm/oai

oai:meral.edu.mm:recid/2246 2021-12-13T06:08:43Z 1582963390870:1582967549708 user-uy

Ferroelastic-Superprotonic Phase Transition of [K3]x[(NH4)3]1-xH(SO4)2 Single Crystal Studied by Raman Scattering Win Kyaw Ye Chan Ohn Than Pho Kaung Sein Htoon Vibrational modes of the sulphate ion in mixed crystals, [K3]x[(NH4)3]1-xH(SO4)2 of Tripotassium Hydrogen Disulphate, K3H(SO4)2 and Triammonium Hydrogen Disulphate, (NH4)3H(SO4) were studied by Raman Scattering Spectroscopy. The V1 - mode frequency of the sulphate ion at room temperature is found to be shifted downwards with different crystalline environments contributed by the increase of countercation K3+ content. The temperature dependence of frequencies and that of linewidths of the V1 mode show anomalous changes near the ferroelasticsuperprotonic phase transition temperature. Critical slowing-down of the H...SO4 defect motion is observed. 2004 http://hdl.handle.net/20.500.12678/0000002246 https://meral.edu.mm/records/2246