Pressure Effects on the Optical Properties of NdVO4
1
Departamento de Física Aplicada-ICMUV, Universitat de València, Calle Dr. Moliner 50, 46100 Burjassot, Spain
2
Laboratorio Materiali Luminescenti, Dipartimento di Biotecnologie, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(5), 237; https://doi.org/10.3390/cryst9050237
Received: 25 April 2019 / Revised: 2 May 2019 / Accepted: 4 May 2019 / Published: 6 May 2019
(This article belongs to the Special Issue Pressure-Induced Phase Transformations)
Abstract
We report on optical spectroscopic measurements in pure NdVO4 crystals at pressures up to 12 GPa. The influence of pressure on the fundamental absorption band gap and Nd3+ absorption bands has been correlated with structural changes in the crystal. The experiments indicate that a phase transition takes place between 4.7 and 5.4 GPa. We have also determined the pressure dependence of the band-gap and discussed the behavior of the Nd3+ absorption lines under compression. Important changes in the optical properties of NdVO4 occur at the phase transition, which, according to Raman measurements, corresponds to a zircon to monazite phase change. In particular, in these conditions a collapse of the band gap occurs, changing the color of the crystal. The changes are not reversible. The results are analyzed in comparison with those deriving from previous studies on NdVO4 and related vanadates. View Full-TextKeywords:
vanadate; zircon; high pressure; band gap; phase transition; optical absorption
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Bandiello, E.; Sánchez-Martín, J.; Errandonea, D.; Bettinelli, M. Pressure Effects on the Optical Properties of NdVO4. Crystals 2019, 9, 237.
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