Structural phase transformation and phase boundary/stability studies of   field-cooled Pb(Mg1/3Nb2/3O3)-32%PbTiO3 crystals
  Structural phase transformations in (001)-oriented (1-x)Pb(Mg1/3Nb2/3O3)-32%PbTiO3 (PMN-x%PT) crystals have been investigated by x-ray diffraction. A C->T->MC sequence was observed in both the field-cooled (FC) and zero-field-cooled (ZFC) conditions. Most interestingly, an anomalous increase in the C->T phase boundary with increasing field has been observed, which is seemingly a common characteristic of crystals whose compositions are in the vicinity of the MPB, irrespective of the width of the T and MC phase regions. 
Hu Cao, Feiming Bai, Jiefang Li, and D. Viehland, Guangyong Xu, H.   Hiraka and G. Shirane