Simulation of the disorder effects in ferroelectric phase transitions using two-dimensional statistical models

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• 作者：R. Riesco ; M. I. Marqué ; s ; A. Pelá ; iz-Barranco ; O. Garcí ; a-Zaldí ; var and C. Aragó
• 刊名：physica status solidi (c)
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：14
• 期：1-2
• 全文大小：476K
• ISSN：1610-1642a

文摘

Two-dimensional Ising models are used to explain the disorder effects in mixed solid solutions and doped relaxor systems. On ferro-ferro solutions like Pb(Zr_1-xTi_x)O₃ (PZT), the composition dependence of the Curie temperature T_C(x) usually deviates from the averaged linear behavior known as the Vegard's law. This deviation is mimicked by a Hamiltonian model including interactions between different types of dipoles in a two dimensional lattice. Doping PZT with lanthanum (PLZT) results in a relaxor behavior that is explained by adding a new term to 2D Ising model that takes into account the interaction between dipoles and itinerant charges.