ABO4 family of ternary oxides contain many compounds sincecation A with valences þ 1, þ 2, þ 3, andþ 4 can be accommodated with cation B with valences þ 7, þ 6, þ 5, and þ 4,respectively. They show interesting technological properties andhave been used during the last years as solid-state scintillators(CaWO4 and PbWO4), laser-host or solid state lasers (YVO4). Anumber of crystal structures in ABX4 compounds, consist of BX4tetrahedra and AX8 eight-coordinated polyhedral, which can beseen as two interpenetrating tetrahedra, known as bidisphenoidsor dodecahedra [1,2]. Among these structures some importantmineral structures as scheelite or zircon are included where A andB cations form two interpenetrating diamond structures in atetragonally distorted fcc array. Zircon is the mineral ZrSiO4 andalso the general name of the compounds crystallizing in thetetragonal I41/amd phase, like many ABO4 silicates, vanadates,phosphates and arsenates (HfSiO4, YVO4, YPO4, and YAsO4).The Scheelite is the mineral CaWO4 and the general name of the
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