The isothermal mode Grüneisen parameterγTðPÞof some Raman modes in PbZr_(1-x)Ti_(x)O_(3)(PZT,x=0.48)were calculated as a function of pressure by means of the observed pressure-dependent volume data of ...The isothermal mode Grüneisen parameterγTðPÞof some Raman modes in PbZr_(1-x)Ti_(x)O_(3)(PZT,x=0.48)were calculated as a function of pressure by means of the observed pressure-dependent volume data of PZT(x=0.48)crystal from the literature at room temperature of 298 K.Those calculated values ofγTðPÞwere then used to compute the pressure dependence of the Raman modes in PZT(x=0.48)ceramic studied here.The observed and calculated values of the Raman wavenumbers in PZT were in good agreement,which indicates that the isothermal mode Grüneisen parameter can also be used to predict the pressure-dependent wavenumbers of some other perovskite-type crystals.Additionally,the pressure dependence of the thermodynamic quantities such as isothermal compressibilityκT,thermal expansionαP and the specific heat C_(P)-C_(V) of PZT(x=0.48)ceramic were predicted at constant temperature of 298 K.Here,the experimentally measurable thermodynamic quantities calculated for PZT(x=0.48)ceramics provide theoretically a significant opportunity for testing.展开更多
文摘The isothermal mode Grüneisen parameterγTðPÞof some Raman modes in PbZr_(1-x)Ti_(x)O_(3)(PZT,x=0.48)were calculated as a function of pressure by means of the observed pressure-dependent volume data of PZT(x=0.48)crystal from the literature at room temperature of 298 K.Those calculated values ofγTðPÞwere then used to compute the pressure dependence of the Raman modes in PZT(x=0.48)ceramic studied here.The observed and calculated values of the Raman wavenumbers in PZT were in good agreement,which indicates that the isothermal mode Grüneisen parameter can also be used to predict the pressure-dependent wavenumbers of some other perovskite-type crystals.Additionally,the pressure dependence of the thermodynamic quantities such as isothermal compressibilityκT,thermal expansionαP and the specific heat C_(P)-C_(V) of PZT(x=0.48)ceramic were predicted at constant temperature of 298 K.Here,the experimentally measurable thermodynamic quantities calculated for PZT(x=0.48)ceramics provide theoretically a significant opportunity for testing.
