Sur de nouvelles phases oxyfluorees derivees du niobate de plomb: Etudes cristallographique et dielectrique
1974; Elsevier BV; Volume: 9; Issue: 12 Linguagem: Inglês
10.1016/0025-5408(74)90148-2
ISSN1873-4227
AutoresG. Campet, J. Claverie, M. Périgord, J. Ravez, J. Portier, Paul Hagenmuller,
Tópico(s)Nuclear materials and radiation effects
ResumoThe solid solution Pb2−xNaxNb2O7−xFx obtained by substitution of oxygen by fluorine in the ferroelectric oxide Pb2Nb2O7 has the cubic pyrochlore structure for 0, 75 ⩽ x ⩽ 1, 85 and monoclinic deformations of this structure for other values of x. The temperature and frequency variations of the dielectric constant and of the dielectric losses have been studied. The high values of ε′r have been attributed to a mechanism of ionic polarizability, and those of tan δ to the mobility of the F− ions.
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