The Role of Spontaneous Polarization in the Negative Thermal Expansion of Tetragonal PbTiO3-Based Compounds Chen, Jun ; Nittala, Krishna ; Forrester, Jennifer S. ; Jones, Jacob L. ; Deng, Jinxia ; Yu, Ranbo ; Xing, Xianran Abstract Publication: Journal of the American Chemical Society Pub Date: July 2011 DOI: 10.1021/ja2046292 Bibcode: 2011JAChS.13311114C