Narrow Results

An analysis of heterophase states was carried out for ferro-active solid solutions of the system ($1-x-y$)NaNbO${}_3-x$KNbO${}_3-y$CdNb₂O₆. A complete stress relief at interfaces between phases in solid solutions with $y=0.05$ and $x=0.10$, 0.40, and 0.45 is realized at the single-domain state of the tetragonal and orthorhombic phases. In solid solutions with $y=0.05$ and $x=0.05$ and 0.20, as well as with $y=0.075$ and 0.10, and $x=0.15$, the formation of a planar interphase boundary being parallel to a zero-net-strain plane occurs at the elastic matching of the single-domain tetragonal and polydomain orthorhombic phases. In contrast to this, at $y=0.05$ and $x=0.25$, 0.30, and 0.35, the complete stress relief is associated with a co-existence of the single-domain orthorhombic and polydomain tetragonal phases, however in some cases, the tetragonal phase aims at a monodomainization.