摘要
Cyanide perovskites have demonstrated significant potential in the design of molecular ferroelastic,ferroelectric,and multiferroic materials.However,previous research has primarily focused on three-dimensional(3D)cyanide perovskites,which are structurally constrained and exhibit limited diversity.In this study,we synthesized a new zero-dimensional(0D)cyanide perovskite ferroelastic material,(MA)_(3)[Fe(CN)_(6)](MA=CH_(3)NH_(3),methylamine),and conducted comprehensive characterization through differential scanning calorimetry(DSC),dielectric measurements,variable-temperature structural analysis,and polarized light microscopy.(MA)_(3)[Fe(CN)_(6)]undergoes an isomorphic phase transition with a spontaneous strain of 0.1063.The birefringence at 300 K and 330 K is 0.302@546 nm and 0.022@546 nm,respectively.The substantial birefringence change up to 0.28 mainly originates from the rotational motion of inorganic and organic components.This work establishes a new pathway for designing 0D cyanide perovskite materials.
基金
supported by the National Key R&D Program of China(2024YFA1509300)
the National Natural Science Foundation of China(22201120)
Gan Po Juncai Support Program−the Academic and Technical Leader Training Program in Major Disciplines(20243BCE51149).
