Polymorphism in copper pyrovanadate

Abstract

Formation and stability temperatures were determined for the three polymorphs of copper pyrovanadate. The low-temperature β phase is formed at 500°C and is stable from room temperature to 610°C. The intermediate phase is stable within 610–705°C. The high-temperature γ phase is stable within 710–780°C. The rates of γ → α and α → β phase transitions upon cooling differ considerably. α-Cu2V2O7 detected at room temperature upon cooling of a molten sample is metastable.