RAVEZ, Jean

doi:10.1051/jp3:1997175

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RAVEZ, Jean
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal de Physique III. 1997, vol. 7, n° 6, p. 1129-1144

EDP Sciences

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The ferroelectric fluorides belong to six families of type (NH4)2BeF4, BaMnF4, SrAlF5, Na2MgAlF7, K3Fe5F15 or Pb5Cr3F19. The oxyfluorides can be separated in two groups: i) the true oxyfluorides with a relatively high F/O value (K3MoO3F3, Na5W3O9F5, Pb5W3O9F10, Bi2TiO4F2, ...); ii) the compositions derived from ferroelectric oxides (perovskite, tetragonal tungsten bronze, pyrochlore, LiTaO3, ...) characterized by a continuous F-O substitution. The phase transitions and the physical properties are discussed. The origin of the spontaneous polarization is described structurally. The variations of the Curie temperature with the type of substitution are related to chemical bonding. The potential interest of these materials for applications is briefly given.< Leer menos

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Ferroelectrics

Oxyfluoride

Fluoride

Inorganic compounds

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The Inorganic Fluoride and Oxyfluoride Ferroelectrics

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