Kiraci, A.09.01. Ortak Dersler Bölümü09. Rektörlük01. Çankaya Üniversitesi2022-03-042025-09-182022-03-042025-09-182021Kiracı, Ali (2021). "A phenomenological study on ferroelastic KH3(SeO3)(2) and KD3(SeO3)(2)", Materials Research Bulletin, Vol. 143.0025-54081873-4227https://doi.org/10.1016/j.materresbull.2021.111472https://hdl.handle.net/20.500.12416/13168Kiraci, Ali/0000-0003-4067-1004The anomalous behavior of the Brillouin frequency shift omega of the soft acoustic mode for KH3(SeO3)(2) and KD3(SeO3)(2), and also the volume thermal expansion proportional to(V) and the specific heat C of KH3(SeO3)(2) have been analyzed for various temperature intervals close to the phase transition temperatures TC at around 211 K and 302 K, respectively. Our extracted values of the critical exponent from C and proportional to(V) of KH3(SeO3)(2) within the temperature intervals of vertical bar T -T-C vertical bar < 7 K are nearly zero, while the critical exponent extracted from the Brillouin frequency shift data of both KH3(SeO3)(2) and KD3(SeO3)(2) within the same temperature interval of vertical bar T -T-C vertical bar < 7 K decrease very rapidly toward to zero as the phase transition temperatures are approached. Our results indicate that the critical behavior of omega, proportional to(V) and C of both KH3(SeO3)(2) and KD3(SeO3)(2) can be described with the same critical exponent within the temperature interval of vertical bar T -T-C vertical bar < 2 K.eninfo:eu-repo/semantics/closedAccessIsing ModelBrillouin Frequency ShiftCritical ExponentKh3(Seo3)(2)Kd3(Seo3)(2)Article10.1016/j.materresbull.2021.1114722-s2.0-85109786933