Structure of Ba(Y+31/2Ta+51/2)O3 and its dielectric properties in the range 102–1014 Hz, 20–600 K

The goal of this work was to understand the correlation between microscopic material parameters and the dielectric function of candidate materials for applications in the microwave frequency range. The structure and dielectric properties of Ba2+(Y3+1/2Ta5+1/2)O3 (BYT), a typical representative of the Ba(B3+1/2B5+1/2)O3 complex perovskite family, has been investigated from 102 to 1014 Hz and from 20 to 600 K. At Tc=253±1 K, BYT undergoes an equitranslational improper ferroelastic, second‐order phase transition, characterized by the tilting of the oxygen octahedra. The space group symmetry changes from Fm3m, in the high temperature phase, to I4/m below Tc. The existence of an intermediate temperature region (Tc−40<T<Tc) has been observed, where the compound exhibits structural and dielectric properties different from those in the well‐defined high (T≳Tc) and low (T<Tc−40 K) temperature phases. Infrared reflectivity (1012–1014 Hz) and submillimeter transmission (1011–3×1012 Hz) measurements yield dielectric...

[1]  S. Nomura,et al.  Ba(Zn1/3Nb2/3)O3–Sr(Zn1/3Nb2/3)O3 Solid Solution Ceramics with Temperature-Stable High Dielectric Constant and Low Microwave Loss , 1982 .

[2]  A. Bruce,et al.  Structural phase transitions , 1981 .

[3]  B. W. Hakki,et al.  A Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range , 1960 .

[4]  K. Kageyama,et al.  Microwave Characteristics of A(B3+1/2B5+1/2)O3 Ceramics (A = Ba, Ca, Sr; B3+= La, Nd, Sm, Yb; B5+= Nb, Ta) , 1989 .

[5]  F. Galasso,et al.  Ba(B0.5Ta0.5)O3 Ordered Perovskite‐Type Compounds, Possible New Laser Host Materials , 1966 .

[6]  E. Pytte,et al.  Theory of a Structural Phase Transition in Perovskite-Type Crystals. II. Interaction with Elastic Strain , 1970 .

[7]  G. Layden,et al.  Phase equilibria and crystal growth in the system BaOYTaO4B2O3 , 1966 .

[8]  J. Fousek,et al.  Dielectric spectra of some ceramics for microwave applications in the range of 1010–1014 Hz , 1989 .

[9]  N. Setter,et al.  Effect of structural changes in complex perovskites on the temperature coefficient of the relative permittivity , 1993 .

[10]  A. Tagantsev,et al.  Intrinsic dielectric loss in crystals , 1991 .

[11]  Helen D Megaw,et al.  CORRIGENDUM: Crystal structure of double oxides of the perovskite type , 1946 .

[12]  A. Tagantsev,et al.  Relation between intrinsic microwave and submillimeter losses and permitivity in dielectrics , 1993 .

[13]  I. Reaney,et al.  Dielectric and Structural Characteristics of Ba- and Sr-based Complex Perovskites as a Function of Tolerance Factor , 1994 .

[14]  J. Petzelt,et al.  Symmetry classification and properties of equi-translation structural phase transitions , 1975 .

[15]  R. O. Bell,et al.  MICROWAVE LOSSES IN STRONTIUM TITANATE ABOVE THE PHASE TRANSITION , 1962 .

[16]  A. Glazer,et al.  Simple ways of determining perovskite structures , 1975 .

[17]  N. Setter,et al.  DiP256: The temperature coefficient of the relative permittivity of complex perovskites and its relation to structural transformations , 1992 .