Year: 2006
Type: article
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 the ${\mathrm{Ba}}_{x}{\mathrm{Sr}}_{1\ensuremath{-}x}\mathrm{Ti}{\mathrm{O}}_{3}$ 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 $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ and $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$. In the phase diagram of the ${\mathrm{Ba}}_{x}{\mathrm{Sr}}_{1\ensuremath{-}x}\mathrm{Ti}{\mathrm{O}}_{3}$ system for small Ba concentration, there are a tricritical point and two multiphase points one of which is associated with up to six possible phases.
Source: Physical Review B
Institutions: Southern Federal University, Ioffe Institute
Language: Latvian
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2008996350