Reversible phase transition and relaxor behavior in Te2V2O9 single crystals grown by Czochralski technique

• Te2V2O9 single crystals were grown along the polar c-axis via the Czochralski crystal growth technique.
• Dielectric studies carried out along the polar axis confirmed the relaxor nature of the Te2V2O9 single crystals.
• Temperature dependent polarized light optical microscopy along a-axis established a reversible phase transition at 614 K.

Te2V2O9 single crystals were grown along the polar c-axis via the Czochralski crystal growth technique. Dielectric studies carried out along the polar axis in a wide temperature range at different frequencies confirmed the relaxor nature of the Te2V2O9 single crystals. Temperature dependent polarized light optical microscopy along a-axis established a reversible phase transition around 614 K. Relaxor nature of Te2V2O9 was attributed to the compositional heterogeneity at micro/nano scale within the grown crystal as vanadium was observed to be present in different oxidation states by X-ray photoelectron spectroscopic studies.