Concentration phase diagram of Ba(x)Sr(1-x)TiO3 solid solutions

Abstract

Method of derivation of phenomenological thermodynamic potential of solid solutions is proposed in which the interaction of the order parameters of constituents is introduced through the account of elastic strain due to misfit of the lattice parameters of the end-members. The validity of the method is demonstrated for Ba(x)Sr(1-x)TiO3 system being a typical example of ferroelectric solid solution. Its phase diagram is determined using experimental data for the coefficients in the phenomenological potentials of SrTiO3 and BaTiO3. In the phase diagram of the Ba(x)Sr(1-x)TiO3 system for small Ba concentration, there are a tricritical point and two multiphase points one of which is associated with up to 6 possible phases.

8 pages, 3 figures

Cited by in corpus (5)

• Phenomenological theory of phase transitions in epitaxial BaxSr(1-x)TiO3 thin films
• Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films
• Superconductivity enhancement in polar metal regions of Sr${}_{0.95}$Ba${}_{0.05}$TiO${}_3$ and Sr${}_{0.985}$Ca${}_{0.015}$TiO${}_3$ revealed by the systematic Nb doping
• Properties of the low-frequency phonon spectra of ferroelectric barium titanate-based heterostructures
• Atomic scale symmetry and polar nanoclusters in the paraelectric phase of ferroelectric materials