Synthesis, physical properties, and atomic structure of niobium-doped RbTiOPO4 crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Single crystals of solid solutions Rb1-xTi1-xNbxOPO4 (RTP:Nb) were grown and the temperature dependences of their dielectric and nonlinear optical properties and electric conductivity were studied. The maximum possible niobium content in these crystals is close to x = 0.1. The niobium impurities decelerate plate-like habit. With increasing doping level, ferroelectric phase growth of (100) faces, and crystals take a plate transitions diffuse and their temperature decreases. A specific feature of the dielectric properties of RTP : Nb crystals is the appearance of a broad relaxation maximum epsilon(33) in the temperature range 200-600 degrees C caused by the formation of vacancies in the rubidium cation sublattice. The intensity of second-harmonic generation under laser irradiation decreases with increasing nobium content. The atomic structure of a crystal with x = 0.01 is studied and it is established that niobium substitutes for titanium only in Ti(1) positions. (C) 2005 Pleiades Publishing, Inc.