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Ferroelectrics Letters Section Volume 16, 1993 - Issue 1-2
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Original Articles

Crystallographic phase transition of NH4ZnF3 by single crystal XRD

Jose Fayos Departamento de Cristalografia, Instituto Rocasolano, CSIC, Serrano 119, 28006, Madrid, Spain
&
Jesus Tornero Departamento de Quimica-Fisica Aplicada. Facultad de Ciencias, U.A.M., 28049, Madrid, Spain
Pages 43-54 | Received 01 Jun 1993, Published online: 17 Aug 2006
 
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Abstract

Below Tc=115K, the Pm3m perovskite structure of NH4ZnF3 is deformed by two tilts of the coupled octahedra ZnF6, about two of its tetrad axes. The first tilt of 2.8° is due to the condensation of a M3 soft mode, while the second one of 1.4° arise from a R25 mode.

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