Yurtseven, HamitKiraci, Ali09.01. Ortak Dersler Bölümü09. Rektörlük01. Çankaya Üniversitesi2025-05-112025-05-1120240031-89491402-4896https://doi.org/10.1088/1402-4896/ad81c5https://hdl.handle.net/20.500.12416/9578Kiraci, Ali/0000-0003-4067-1004The critical behavior of the thermodynamic quantities is studied for the two phase transitions near the transition temperatures (74 K and 222 K) in the hexagonal (h) BaTiO3. A linear relationship has been established between the variations of the frequency shifts and of the dielectric constant by using the literature data in h-BaTiO3. Temperature and pressure dependence of the mode Gr & uuml;neisen parameters ( gamma p and gamma T ) are also described by a power-law formula as the other thermodynamic parameters near Tpt in h-BaTiO3. Our results show that they explain the observed behavior adequately, in particular soft-mode frequency, dielectric constant, thermal expansion, the excess specific heat and the entropy near Tpt in h-BaTiO3. Temperature dependence of the isobaric mode Gr & uuml;neisen parameter ( gamma p ), enthalpy and the Gibbs free energy, which we have evaluated, can be compared with experiments in h-BaTiO3.eninfo:eu-repo/semantics/closedAccessThermodynamic And Dielectric PropertiesCritical ExponentsTwo Hexagonal Phase TransitionsH-Batio3Article10.1088/1402-4896/ad81c52-s2.0-85207657250