Structural, Raman Spectroscopy and Photoluminescence Study of the Heaviest Rare Earth Metal Based Titanate

Biswas, Ananya (2019) Structural, Raman Spectroscopy and Photoluminescence Study of the Heaviest Rare Earth Metal Based Titanate. Masters thesis, Indian Institute of Science Education and Research Kolkata.

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Abstract

LuTiO₃ is a rare earth metal based perovskite. Generally rare earth metals have +3 oxidation state. Extreme temperature and pressure condition study on this perovskite was intended to be done. Firstly the perovskite was synthesized with a very special new technique Laser quenching method. It appears to be a very interesting perovskite. Interestingly not much of a study on this perovskite have been found in so far research articles. Low temperature (3K) Raman spectroscopic study have been done on this sample and subsequent photoluminescence study showed surprising behaviour. From temperature dependent Raman study no phase transition or new Raman mode appearance was found, which suggest not much of a structural change has been occurred. Whereas temperature dependent photoluminescence study showed remarkably strange behaviour. Around 180K a bunch of new peak started to arise. The explanation of this might be different orbital coupling or effect from the defect in the unit cell. To confirm this further study is needed to be done. It might be spin-orbital coupling as well. It showed phonon-phonon and phonon-spin wave coupling below 50 K and 150 K respectively.

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