Preparation and characterization of Bi 4–x Pr x Ti 3 O 12  solid solutions

A. I. Klyndyuk; E. A. Chizhova; A. I. Poznyak

doi:10.15826/chimtech/2017.4.4.01

Preparation and characterization of Bi_4–xPr_xTi₃O₁₂ solid solutions

A. I. Klyndyuk, E. A. Chizhova, A. I. Poznyak

Abstract

The Bi₄_–_xPr_xTi₃O₁₂ (BPT) solid solutions (x = 0.05, 0.10, 0.15) with small praseodymium content were prepared by solid-state method. Thermal, electric, and dielectric properties of BPT were studied. It was revealed that BPT titanates crystalize in аn orthorhombic structure and exhibit p-type semiconductivity. Dielectric constant of BPT increased, Curie temperature (T_C), electrical conductivity and dielectric losses decreased, but lattice parameters and thermo-EMF coefficient remained practically unchanged with the increase of praseodymium content in layered Bi₄_–_xPr_xTi₃O₁₂. It was determined that activation energy of direct current (DC) electrical conductivity and linear thermal expansion coefficient (LTEC) of BPT changes at ferroelectric (FE) → paraelectric (PE) phase transition. The activation energy and LTEC changed below and above T_C from 1.08–1.56 eV to 0.45–0.86 eV and from (9.10–10.80)×10^–6 K^–1 to (13.12-14.61)×10^–6 K^–1_, respectively. The AC electrical conductivity studies of BPT illustrated short-range order with ionic translations assisted by small-polaron hopping.

Keywords

layered bismuth titanates; dielectric constant; dielectric losses; electrical conductivity; thermo-EMF; thermal expansion

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DOI: https://doi.org/10.15826/chimtech/2017.4.4.01

Copyright (c) 2017 A. I. Klyndyuk, E. A. Chizhova, A. I. Poznyak