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Closed Access item Properties and phase transition of the ordered perovskite Pb2MnWO6
Merino, R. I.
Sánchez, María Concepción
|Publisher:||Institute of Physics Publishing|
|Citation:||Journal of Physics: Condensed Matter 18: 2261-2271 (2006)|
|Abstract:||Pb2MnWO6 has been synthesized and its structure determined by powder xray
diffraction. This sample undergoes a first order structural phase transition at ∼445 K. This transition is coupled to a change in the electrical properties manifested by a sharp discontinuity of the dielectric permittivity at the phase transition temperature. Pb2MnWO6 is cubic paraelectric above 445 K and orthorhombic with electric ordering below such a temperature. The structural refinement reveals Pb displacements in the low temperature phase in agreement with an antiferroelectric ordering. Diferential scanning calorimetry and magnetic susceptibility measurements
are also reported. The large entropy content of the transition evidences the presence of an ordering process. Pb2MnWO6 is paramagnetic in a broad temperature range in agreement with the presence of high-spin Mn2+ ions. A magnetic anomaly at 45 K may be associated with antiferromagnetic ordering
of these ions that would coexist with the antiferroelectric state at very low
|Description:||11 pages, 5 figures, 3 tables.|
|Publisher version (URL):||http://dx.doi.org/10.1088/0953-8984/18/7/013|
|Appears in Collections:||(ICMA) Artículos|
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