We report Raman signatures of electronic topological transition (ETT) at 3.6GPa and rhombohedral ({\alpha}-Bi2Te3) to monoclinic ({\beta}-Bi2Te3)structural transition at ~ 8 GPa. At the onset of ETT, a new Raman mode appearsnear 107 cm-1 which is dispersionless with pressure. The structural transitionat ~ 8 GPa is marked by a change in pressure derivative of A1g and Eg modefrequencies as well as by appearance of new modes near 115 cm-1and 135 cm-1.The mode Gr\"uneisen parameters are determined in both the {\alpha} and{\beta}-phases.
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