Registration Number
0224U031763,
0122U001959
, R & D reports
Title
Structural aspects of optimization of functional properties of complex oxide compounds for modern phosphors, ionic conductors and magnetic materials
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Head
Slobodianyk Mykola S., Доктор хімічних наук
Registration Date
12-06-2024
Organization
Taras Shevchenko National University of Kyiv
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One of the most important challenges is designing a glass-ceramic material which, on the one hand, would be suitable for its application as a coating for LEDs, and on the other hand, would have luminescent properties with color coordinates as close as possible to the international standard CIE1931. The composite material consists of two components: a phosphor with a high luminescence quantum yield and an oxide glass with alike composition. At the second stage of the project, the optimal composition of glass was selected, the most promising phosphors were selected, and the first experiments on the production of composites were carried out.
The Rietveld method determined the constitution of two-slab perovskite-like structure of 17 isovalently substituted phases of AIILn2BIII2O7 type in the systems Ba1-xSrxLn2In2O7 (Ln = La, Nd), BaLn2-xSmxIn2O7 (Ln = La, Nd), Sr1-xCaхLa2Sc2O7, SrLa2-xDyxSc2O7 and found structural factors that limit her area of existence. The main regularities of the influence of type and degree substitution of atoma in A-position on the structure of isovalently substituted phases of AIILn2BIII2O7 type have been established. It is shown that the introduction of substituent atoms into two-slab structure compounds of AIILn2BIII2O7 type reduces the interblock distance A–O2 and increases the degree of deformation of interblock polyhedra АO9. Knowledge of structure of phases AIILn2BIII2O7 type lays the foundations for regulating the parameters of structurally dependent properties of materials based on them.
The biphasic calcium phosphates modified with microelements (sodium, potassium, magnesium and zinc) were synthesized and investigated. The possibilities of phase composition regulating of biphasic composites at their production were established. These results are especially important in the further development of materials with controlled bioresorption for bone tissue restoration.
Product Description
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Strutynska Nataliia Yu.
Stus Nataliia V.
Titov Yurii О.
Kateryna V. Terebilenko
Tymoshenko Mariana V.
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2024-06-12
