Vanadium was incorporated into zircon by heating in air and in controlled atmospheres of oxygen. It was found that V 2+ could not be incorporated into zircon by firing in a hydrogen atmosphere. Comparison of the absorption spectrum of V 3+ in YPO 4 with that of blue zircons prepared in air and oxygen atmospheres, with and without fluoride additives, showed that it is highly probable that V 4+ is solely responsible for the color of the pigment. Crystal field analysis confirmed the existence of V in the ZrO 8 position in the zircon structure.
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DEMIRAY et al. (1970) studied this question.
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