Abstract
The compounds with a chemical formula M2XO4 (M = K, Rb, Cs, Tl and X = S, Se) belong to a -K2SO4 family, and continue to attract much attention for their structural phase transitions and their associated physical properties. The characteristics for this type of crystals are their isomorphism, incommensurate, ferroelectricity, superionic conductivity and sequential structural phase transitions. Sodium selenate, Na2SeO4, crystal has the same chemical formula as M2XO4, but its crystal structure at room temperature is not isomorphous with the -K2SO4-type crystals mentioned above. The space groups for the Na2SeO4 and -K2SO4-type crystals at room temperature are orthorhombic Fddd and Pnam, respectively. The Na2SeO4 crystal exhibits a high-temperature phase transition at 852K from orthorhombic to hexagonal systems. This symmetry change is similar to that of a K2SeO4 crystal. 3)
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