Abstract
The investigation results of the processes of phase formation in barium niobate, strontium, and their solid solutions in the conditions of the variability of the thermodynamic background are presented. The formation of a grain landscape and dielectric properties (including relaxation phenomena) in the solid solutions of strontium niobate and their solid solutions and the establishment of regularities in the formation of radio-absorbing properties in them are studied.
Highlights
Barium strontium niobates (BSNs), characterized by extraordinary photorefractive, electro-optic, dielectric, piezoelectric, and pyroelectric properties [1,2], are among the promising and sought-after materials for use in pyroelectric detectors, holographic memory devices, etc
The choice of optimal sintering temperatures (Tsint. ) for a series of samples burned at (1570 ÷ 1670) K showed that ceramics obtained at the
Tsint. = 1650K (Figure 1) [9] have the highest density, which was confirmed by measurements of the ε/ε0 dependences on T in the heat-cool regime (f = 500 kHz): the largest peaks ε/ε0, the smallest temperature hysteresis at temperatures below the Curie temperature (Tc ), and its absence above Tc is characteristic precisely for ceramics prepared at this Tsint. (Figure 2a)
Summary
Barium strontium niobates (BSNs), characterized by extraordinary photorefractive, electro-optic, dielectric, piezoelectric, and pyroelectric properties [1,2], are among the promising and sought-after materials for use in pyroelectric detectors, holographic memory devices, etc. The known difficulties in obtaining single crystals and the highest temperatures of sintering of ceramics (>1720 K) make it preferable to choose a solid state in the form of low-dimensional structures (thin films), which is explained by the intensive development of works aimed at the creation of integrated devices, as well as low temperature processes for the preparation of thin-film BSN products, including a sol-gel method on a magnesium oxide substrate [3]. SrNb2 O6 is not ferroelectric (FE), having a complex structure that is not isomorphic to either BaNb2 O6 or PbNb2 O6. The solid solutions (SS) of the binary system (1) of BaNb2 O6 -xSrNb2 O6 have FE properties [5], having two FE phases: one is tetragonal, Appl.
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