Registration Number
0216U006295,
0115U000443
, R & D reports
Title
Monocrystalline and nanostructured materials for energy and emission converters and electronics and sensor devices
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Head
Ubizskii S.B.,
Registration Date
10-03-2016
Organization
Lviv Polytechnic National University
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Works on preparation of stoichiometric and anion-deficient solid solutions of cobaltites, titanates and aluminates of rare- and alkaline earth elements by solid-phase synthesis method. The parameters of the crystal structure and thermal expansion are determined, the effect of "chemical pressure", electron concentration, defect structure and temperature on spin and structural phase transitions in specifying the materials is studied, phase diagrams are build. Nanopowders of perovskites are synthesized and their phase composition, sizes and morphology of grains are studied. From the synthesized powders, the ceramic samples are prepared for research for their use as elements of gas sensors. A method for studying the magnetic moment and sizes of superparamagnetic nanoparticles such kind as "magnetic core - shell polymer" is developed. Magnetic properties of synthesized nanopowders of maghemite, their composites and colloidal systems based on them are investigated by this method. The phase composition, average sizes and differential magnetic susceptibility of nanoparticles are determined. The changes in the optical characteristics of single crystals of LiNbO3 with depth are studied depending on temperature, treatment time and environment (hydrogen and oxygen) in which a thermochemical annealing was conducted, and crystallographic direction. Models of defect centers formed as a consequence of annealing are proposed.
Product Description
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Афанасьєв Д.М.
Бурий О.А.
Василечко Л.О.
Добрянський О.А.
Мартинюк Н.В.
Павлик Л.П.
Павловська О.Б.
Пекінчак О.В.
Степчук Р.В.
Сугак Д.Ю.
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2020-04-02
