Ferroelectrics with the structure of hexagonal tungsten bronze type

Abstract
Synthesis, crystal growth, and characterization of some compounds AB3O9 with the structure of hexagonal tungsten bronze (HTB) type were carried out. A study of dielectric, optical, and other features of KNbW2O9 and RbNbW2O9 single crystals shows that they undergo diffuse ferroelectric phase transitions in the temperature regions 560-600°C and 750-800°C, respectively. Ferroelectric properties are also expected in case of many other compounds of this family.

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