Perovskite systems with structurally different multiferroic end members are being extensively investigated, because large phase-change magnetoelectric responses have been anticipated at the morphotropic phase boundaries (MPBs) between polymorphic forms with differentiated ferroic orderings. (1-x) YMnO₃-x BiFeO₃ is one such system, for which two continuous perovskite solid solutions with rhombohedral R3c and orthorhombic Pnma symmetries are present, and coexist across a wide compositional range. This might be a discontinuous MPB between a non-polar and a polar phase, at which the orthorhombic to rhombohedral transition may be electrically induced with a distinctive magnetic signature. In order to explore this possibility, magnetic properties have been characterized across the whole system, and relationships between perovskite crystal structure and magnetism have been established. Distinctive evolutions within each solid solution are revealed that define a region between x = 0.6 and 0.9, where a non-polar orthorhombic ferromagnetic phase coexists with a polar rhombohedral antiferromagnetic one at room temperature.

具有结构不同的多铁性末端成员的钙钛矿体系正在被广泛研究，因为已经预料到在具有不同铁性有序的多晶型之间的变质相界（MPB）处会出现大的相变磁电响应。（1-X）的YMnO ₃ -x的BiFeO ₃是一个这样的系统中，用于与菱形两条连续的钙钛矿固体溶液[R 3c和斜方晶Pnma存在对称性，并且在广泛的组成范围内共存。这可能是非极性和极性相之间的不连续MPB，在正交相处，正交晶向菱面体的过渡可以通过独特的磁学特征进行电感应。为了探索这种可能性，已在整个系统中表征了磁性能，并建立了钙钛矿晶体结构与磁性之间的关系。揭示了每种固溶体的明显演化，定义了x = 0.6和0.9之间的区域，在室温下，非极性正交晶体铁磁性相与极性菱形反铁磁性相共存。