In this work, theoretical investigation of cubic Pm-3m phase RbGeO3 germanate perovskite using plain wave basis, density function theory (DFT) is conducted. DFT modelling calculations, clearly shows that this perovskite exhibits thermodynamic and dynamical stability in the cubic phase, identical to that of high pressure perovskite cubic SrGeO3. As from the computed phonon dispersions this system also exhibits anti-ferro distortive (AFD) instabilities, much similar as that observed in case of cubic SrGeO3 at ground state conditions. Hence, from this study we conclude that ideal cubic perovskite phase of RbGeO3 can be synthesized under identical experimental conditions, as that reported for SrGeO3 in the literature. Further, we report the fundamental opto-electronic properties of this material system from first principles DFT calculations, which are not yet reported and as per calculated properties this perovskite material is found to be well suited for opto-electronic and plasmonics based applications.

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First principles investigation of cubic RbGeO3 novel inorganic lead-free germanate perovskite material for optoelectronic and plasmonic applications

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First principles investigation of cubic RbGeO3 novel inorganic lead-free germanate perovskite material for optoelectronic and plasmonic applications