Ferroelectricity: Measurement of the dielectric susceptibility of strontium titanate at low temperatures

Abstract

A cryogenic experiment determining the dielectric susceptibility of the ferroelectric substance, strontium titanate, in the 90-to 300-K temperature range is described. Evidence is presented for a structural phase transition in strontium titanate at 110 K. The experiment is suitable for advanced students.

Synthesis and characterization of nanocrystalline strontium titanate through a modified combustion method and its sintering and dielectric properties

“…It is characterized by good mechanical strength, high thermal and chemical stability, low coefficient of thermal expansion, high melting temperature, large nonlinear optical coefficients and, large dielectric constant [1,2] which are responsible for their widespread applications in the manufacture of thermistors [3], multilayer capacitors [4], and electro-optical devices [5], electromechanical devices [6], dynamic random-access memory [7], and field-effect transistors [8]. Superconducting quantum interference device (SQUID) is fabricated using superconductor thin films developed on SrTiO 3 substarte [9].…”

Interaction between quantum paraelectricity and ferroelasticity in SrTiO3

“…None of the detailed studies of the dielectric behaviour of SrTiO 3 in the quantum paraelectric regimes have included this effect explicitly in their analyses. More recent studies of the dielectric susceptibility of SrTiO 3 between 90 and 300 K [41,43,44] found a deviation from classical Curie-Weiss behaviour at 105-110 K. Viana et al [43] made the connection between this anomaly and the ferroelastic phase transition, but argued that the mechanism was the onset and dynamics of ferroelastic twin walls.…”

Effects of Nb5+ Addition on Microstructure and Dielectric Properties of BaTiO3

“…Isovalent impurities in BT ceramics do not significantly affect conductivity, but off-valent impurities are known to significantly affect ferroelectric behavior and conductivity. Although only few regions rich in Nb were detected by EDS, their influence on the micro-structural uniformity was negligible, as reported in reference [11]. Fig.…”