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Pressure-driven phase transformations and phase segregation in ferrielectric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>CuIn</mml:mi><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:mtext>−</mml:mtext><mml:msub><mml:mi>In</mml:mi><mml:mrow><mml:mn>4</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">…
Layered multiferroic materials exhibit a variety of functional properties that can be tuned by varying the temperature and pressure. As-synthesized $\mathrm{CuIn}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ is a layered material that displays ferrielectric behavior at room temperature. When synthesized with Cu deficiencies, $\mathrm{CuIn}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ spontaneously phase segregates to form ferrielectric $\mathrm{CuIn}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ and paraelectric ${\mathrm{In}}_{4/3}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ (IPS) domains …