Structural study of manganese multiferroics in phase diagram Ba$_{\mathrm{1-x}}$Sr$_{\mathrm{x}}$Mn$_{\mathrm{1-y}}$Ti$_{\mathrm{y}}$O$_{\mathrm{3}}$.

We have designed and synthesized unique manganese multiferroics exhibiting ferroelectricity and magnetism originating solely from Mn ion. Structural study shows large ferroelectric-type distortion, which are reduced by antiferromagnetism. Ti-substituted compounds with increase temperature and size of ferroelectric polarizations show an unusually large hysteresis of ferroelectric transitions and strong dependence of pressure.