同質異形體(polymorph),又稱同質異晶物,是指由化學組成相同的物質,在不同的物理化學條件下形成的不同結構的晶體。相應地,稱這種物質具有同質異晶現象(polymorphism)。同質異形體由於結構不同會表現出不同的物理化學性質。例如,氮化硼六方氮化硼立方氮化硼等同質異形體。

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