The role of the secondary pyroelectric effect in a ferroelectric relaxor 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3

The depth profile of the pyroelectric coefficient effective values of a 0.72Pb(Mg 1/3 Nb 2/3 )O 3 -0.28PbTiO 3 ( PMN -0.28 PT ) single crystal is studied. It was shown that owing to high pyroelectric coefficients the secondary pyroelectric effect significally contributes (∼40%) to the total pyroelectric coefficient.