Electric Quadrupole interactions at $^{181}$Ta in BaTiO$_3$/BaHfO$_3$ Solid

R. E. ALONSO; P. DE LA PRESA; A.P. AYALA; A. LÓPEZ GARCÍA

JOURNAL OF THE KOREAN PHYSICAL SOCIETY

Año: 1998 vol. 32 p. 634 - 635

0374-4884

In ferroelectric ABO$_3$ perovskites the substitution of B cation by another one of the same chemical group can strongly alter its electric properties. In this contribution we report the results of a systematic study of BaTi$_{1-x}$Hf$_x$O$_3$ solid solutions in the paraelectric phase with x= 0.95, 0.90, 0.70. 0.50 and 0.3. Samples were prepared by firing mixtures of the corresponding oxides at 1300 C and characterized by XRD analysis. We have measured the hyperfine interactions at $^{181}$Ta in B sites as a function of temperature for each concentration. The electric quadrupole interaction measured in these materials reflects the distortion of the electron distribution around probes. These results are analyzed in terms of hafnium concentration.