Effect of ionic radii on the Curie temperature in Ba1-x-ySrxCayTiO3 compounds
نویسندگان
چکیده
A series of Ba1-x-ySrxCayTiO3 compounds were prepared with varying average ionic radii and cation disorder on A-site. All samples showed typical ferroelectric behavior. A simple empirical equation correlated Curie temperature, TC, with the values of ionic radii of A-site cations. This correlation was related to the distortion of TiO6 octahedra observed during neutron diffraction studies. The equation was used for the selection of compounds with predetermined values of TC. The effects of A-site ionic radii on the temperatures of phase transitions in Ba1-x-ySrxCayTiO3 were discussed.
منابع مشابه
Crossover in the magnetic response of single-crystalline Ba1â‹TMxKxFe2As2 and Lifshitz critical point evidenced by Hall effect measurements
We report on the doping evolution of magnetic susceptibility χ(T) and Hall coefficient RH in high-quality Ba1−xKxFe2As2 (0.13≤x≤1) single crystals. It is found that the normal-state magnetic susceptibility of Ba1−xKxFe2As2 compounds undergoes a crossover from linear-T dependence in the undoped and underdoped samples into KFe2As2-type magnetic response in the overdoped samples with increasing K ...
متن کاملروتنوکوپراتها: میدان رقابت ابررسانایی و مغناطیس
We have compared the structural, electrical, and magnetic properties of Ru(Gd1.5-xPrx)Ce0.5Sr2Cu2O10-δ (Pr/Gd samples) with x = 0.0, 0.01, 0.03, 0.033, 0.035, 0.04, 0.05, 0.06, 0.1 and RuGd1.5(Ce0.5-xPrx)Sr2Cu2O10-δ (Pr/Ce samples) with x = 0.0, 0.01, 0.03, 0.05, 0.08, 0.1, 0.15, 0.2 prepared by the standard solid-state reaction technique with RuGd1.5(GdxCe0.5-x) Sr2Cu2O10-δ (Gd/Ce samples) wi...
متن کاملخواص الکتریکی و مغناطیسی ترکیب فرومغناطیس- ابررسانای Ru(Gd1.5-xPrx)Ce0.5Sr2Cu2O10-δ
Coexistence of superconductivity and magnetic ordering or their mutually exclusive existence in solids is one of the fundamental problems of solid state physics. To determine the effect of Pr substitution for Gd on electrical and magnetic properties of RuGd1.5Ce0.5Sr2Cu2O10-δ (Ru-1222), Ru(Gd1.5-xPrx)Ce0.5Sr2Cu2O10-δ with x=0.0, 0.01, 0.03, 0.03 3 , 0.04, 0.05, 0.06, 0.1 have been prepared by...
متن کاملHigh temperature electrical transport properties of nanophasic Ba1-XSbXMnO3
Nano-phasic Ba1-XSbXMnO3 have been synthesised through sol-gel citrate route. The XRD pattern has been found to be having some brown millerite phase along with pervoskite due to doping induced anti-site effect. The dependence of electrical transport at high temperatures have been studied employing thermal activation model, variable range hopping (VRH) and small polaron hopping model (SPH) to ac...
متن کاملتغییرحجم یاخته بسیط بدون تغییر فاز بلوری و پیدایش اثر کوندو در نقطه بحرانی ترکیبات بین فلزی بر پایه عنصر مغناطیسی Gd
In this paper, results from X-ray diffraction and the variation of electric resistance versus temperature of Gd3AuxAl1-x intermetallic compound are reported. All samples formed in orthorhombic crystalline structure with Pnma space group. In measuring the lattice parameters by X-ray diffraction method, deviation from Vegard’s rule has been seen. This deviation at x = 0.4 maximizes. In addition, ...
متن کامل