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The solid solution $0.5Ba(Ti_{0.8}Zr_{0.2})O_3$-$0.5(Ba_{0.7}Ca_{0.3})TiO_3$(BCZT) has become a promising member of the lead-free piezoelectric materialsbecause of its exceptionally high piezoelectric properties. In this study, wefocus on studying pressure-dependent Raman spectroscopy, powder x-raydiffraction and dielectric constant measurements on BCZT. The data show severalstructural transitions are present, where the system from ambient mixed phase(tetragonal, {\it {P4mm}}+ orthorhombic {\it {Amm2}}) transforms into singlephase ({\it {P4mm}}) at 0.26 GPa, then converts into cubic phase ({\it {Pm3m}})at 4.7 GPa followed by another possible structural re-ordering around 10 GPa.Although there have been a lot of unanimity with the ambient crystallographicstate of BCZT, our analysis justifies the presence of an intermediateorthorhombic phase in the Morphological Phase Boundary (MPB) of BCZT phasediagram. The transformation tetragonal to cubic is indicated by the Raman modesoftening, unit cell volume change and the $(Ti/Zr)O_6$ octahedra distortion,which coincides with the well-known ferroelectric-paraelectric transition ofthe system. The sudden drop in the dielectric constant value at 4.7 GPa alsoconfirms the loss of ferroelectric nature of the BCZT ceramic.

High Pressure Structural Investigation on Lead-Free Piezoelectric $0.5Ba(Ti_{0.8}Zr_{0.2})O_3$-$0.5(Ba_{0.7}Ca_{0.3})TiO_3$