Structure instability-induced high dielectric properties in [001]-oriented 0.68Pb(Mg
1/3
Nb
2/3
)O
3
–0.33PbTiO
3
crystals
Li Xiao-Juan
1, 2, †
, Fan Xing
1
, Xi Zeng-Zhe
1
, Liu Peng
2
, Long Wei
1
, Fang Pin-Yang
1
, Nan Rui-Hua
1
Polarized micro-Raman spectra of [001]-oriented PMN–33PT crystal at specific temperatures.