nayana-c1.867c992ae9100904cc61c84591adf0f8f863e0387e30f0d0dbc86640e9f50a1a.en.validation.2602

The task

Which of the following publications discusses the nature of the ferroelectric phase transition in PbTiO3? A. [81] N. Sicron, B. Ravel, Y. Yacoby, E. A. Stern, F. Dogan, and J. J. Rehr. Nature of the ferroelectric phase-transition in pbtio3. Physical Review B, 50:13168-13180, 1994. B. [82] B. Bechav, N. Sicron, Y. Yacoby, B. Ravel, M. Newville, and E. .A. Stern. Structural disorder in oxygen perovskite crystals. Physica C, 209, no.1-3:55-8, 1993. C. [83] B. Ravel, E. A. Stern, Y. Yacobi, and F. Dogan. Lead titanate is not a classic case of a displacive ferroelectric phase-transition. Japanese Journal Of Applied Physics Part 1-Regular Papers Short Notes & Review Papers, 32:782-784, 1993. D. [85] J. Z. Larese, L. Passell, and B. Ravel. Orientational ordering of ethylene on graphite. Canadian Journal Of Chemistry-Revue Canadienne De Chimie, 66:633-636, 1988. Return only the single uppercase letter of the correct option.