Composite materials based on hydroxyapatite are widely used for bone tissue engineering. There is evidence of a positive effect of the presence of strontium in osteoplastic materials in the case of a Ca/Sr certain ratio. To examine the effect of the addition of Sr2+, a study was made by introducing it into the material composition based on biogenic hydroxyapatite and sodium borosilicate glass (50/50% wt.). The strontium was introduced into the composition in an amount of 1% wt. Composite materials were obtained at final sintering temperatures of 780 °C and a sintering time of 1 h. The effect of additions of glass phase and strontium affect changes in the crystal lattice of biogenic hydroxyapatite was investigated with the help of X-ray phase analysis, IR spectroscopy. Also the behavior of composites in vitro in physiological solution was studied.
Materials based on CeO2-La2O3-Eu2O3 and La2O3-Eu2O3 systems are promising
candidates for a wide range of applications, but the phase relationship has
not been studied systematically previously. The phase relations in the
CeO2-La2O3-Eu2O3 ternary system at 1500?C and binary La2O3-Eu2O3 system at
1600-1500?C were studied in air by X-ray diffraction (XRD) investigation in
the overall concentration range. The isothermal section of the phase diagram
for the CeO2-La2O3-Eu2O3 system has been constructed. It was established that
in the ternary CeO2-La2O3-Eu2O3 system there exist fields of solid solutions
based on hexagonal (A) modification of La2O3, cubic modification of CeO2 with
fluorite-type structure (F), cubic (C) and monoclinic (B) modification Eu2O3.
It was established that in the binary La2O3-Eu2O3 system there exist fields
of solid solutions based on hexagonal (A) modification of La2O3 and
monoclinic (B) modification Eu2O3. The phases were separated by two-phase
fields (A+B). The refined lattice parameters of the unit cells for solid
solutions and microstructures of the definite field of compositions for the
systems were determined.
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