Dielectric Properties and Phase Transitions of Ba(Ti_1-xSn_x)O₃ Solid Solution

Abstract

In Ba(Ti1- x Sn x )O3 solid solution, for Sn concentration x≤0.1, the permittivity follows the Curie-Weiss law above the Curie point T c. The increase in the peak value of the permittivity at T c is due to the change in ferroelectric transition from first order to second order with increasing x. For x>0.1, some deviations from the Curie-Weiss law are observed in a narrow temperature region above T c. The diffuse phase transition was observed. For x>0.2, the Curie-Weiss law does not hold over a wide temperature range. The dielectric dispersion was observed in the radio-frequency range (10 kHz–10 MHz). With increasing Sn concentration, the change in the phase transition from a normal ferroelectric transition to relaxor through the diffuse phase transition was observed.

Incipient piezoelectrics and electrostriction behavior in Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 lead-free ceramics

“…Careful observation indicates that undoped BNKT has a peak splitting at $46 , corresponding to the (002)/(200) reflection of a tetragonal phase. 21 Similar to the changes in X-ray diffraction patterns for BNT-BT-KNN, 3 Sn-doped BT, 22 BiScO 3 -Bi(Zn 0.5 Ti 0.5 )O 3 -BaTiO 3 (BS-BZT-BT), 23 BaTiO 3 -BiYbO 3 (BT-BY), 24 and modified BNKT ceramic systems, 4-10 the increase in Sn concentration causes the tetragonal (002)/(200) peaks to gradually merge into a single (200) pc (the subscript "pc" denotes pseudocubic Miller index) reflection at x ¼ 0.08, indicative of the loss of macroscopically conceivable non-cubic distortion. The trend is consistent with the previous results as shown in the BNT-BKT system with other chemical modifiers.…”

Barium Titanate-Based Materials – a Window of Application Opportunities

“…One important characteristic for a material to be suitable for dielectric bolometer (DB) mode of infrared sensor applications is to have a large (Mueller et al, 2004;Lu et al, 2004;Yasuda et al, 1996;Xiaoyong et al, 2003). Moreover, Yasuda and al.…”

Direct Determination of Cationic Disordering in Sodium Bismuth Titanate

“…The relaxor behavior in complex perovskite oxides has been mostly studied in lead-based perovskites such as Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Sc 1/2 Ta 1/2 )O 3 and Pb 1-x La x (Zr y Ti 1-y ) O 3 (Smolenskii et al, 1961a;Chu et al, 1993;Dai et al, 1994;Krunmins et al, 1994); relaxor property is explained to be attributed to nano polar cluster with a cationic ordering, which is embedded in the nonpolar matrix with a cationic disordering. In addition, homovalent solid solutions, such as Ba(Ti 1-x Zr x )O 3 and Ba(Ti 1-x Sn x )O 3 , also exhibit a relaxor characteristic with compositional disorder (Sciau et al, 2000;Simon et al, 2004;Yasuda et al, 1996). However, in case of NBT, the origin of relaxor ferroelectricity is still controversial; the relaxor ferroelectricity is said to be induced by the polar nanoregions (PNRs) just like in the lead-based perovskites (Tai & Lereah, 2009;Yao et al, 2012), while third-party phase, such as a modulated orthorhombic phase mediating between rhombohedral and tetragonal, is reported to plays a crucial role in the relaxor property (Dorcet et al, 2008a(Dorcet et al, , 2008bLevin & Reaney, 2012).…”