The purpose of the article is to identify patterns of change in the properties of biocompatible coatings during modernization of its structure by changing the morphology and crystallinity of the starting powder particles of hydroxyapatite (HA) for agglomeration and subsequent grinding. Material and methods. We investigated the morphology, degree of crystallinity and internal tension in HA powder with a particle size of 40-90 microns in the initial state and after the agglomeration process and structure piasmasprayed HA coatings application methods ray analysis (XRF and XRD) on DRON-3, infrared spectroscopy (FT-IR spectrometer Nicolet 6700), optical (MIM-8) and atomic force microscopy (SMM-2000), the laser microprobe (Spectrum 2000). Results: It was shown that change in particle morphology HA agglomerated and subsequently grinding increases the uniformity of the porous structure, its crystallinity, reduce internal stresses developing surface morphology of the coating and its nanostructuring. Conclusion. It is recommended for the improvement of characteristics of the porous structure (uniformity, strength, adhesion), and the surface morphology of implant to use agglomerating starting powders and their subsequent grinding.
Melnikova I.P., Lyasnikova A.V., Lyasnikov V.N. Particle morphology of hydroxyapatite and its influence on the properties of biocomposite plasma coatings // Saratov Journal of Medical Scientific Research, Vol. 9, Issue 3, 2013, pp. 441-445

Intermediate temperature Solid Oxide Fuel Cell (IT-SOFC) shows number of advantages over high temperature SOFCs (HT-SOFCs), which includes smaller thermal mismatch between its components, rapid startup with less energy consumption etc. In the present paper, we are presenting the synthesis of ceria based oxygen ion conductor as an electrolyte for the low temperature SOFC. The bulk Gd0.1Ce0.9O1.95 materials have been prepared using ceramic route. Since sintering of this oxide is a crucial parameter, which affects the micro-structural and electrical properties, the green pellets were sintered at 1400, 1500 and 1600C. The synthesized samples were characterized for their structural, elemental, morphological and electrical properties using XRD, EDAX, SEM and dc conductivity, respectively. The density measurements were done for estimation of porosity before and after sintering.

The gadolinium-doped ceria (GDC) is considered as one of the most promising electrolytes for intermediate temperature solid oxide fuel cells (IT-SOFCs). Since the operating temperature of SOFC mainly depends on properties of electrolytes, the structural, morphological and electrical properties of GDC are studied as a function of concentration of ‘Gd’ and sintering temperature. The lattice parameter, density, surface morphology and conductivity of GDC samples are improved upon sintering. Further an increase in lattice parameter with concentration of Gd confirms the dissolution of Gd2O3 in CeO2. The crystallite size and grain size was observed to decrease with “Gd” concentration. All GDC samples sintered at 1773 K showed uniform and smoother surfaces with conductivity not, vert, similar0.1 S cm−1 at 1023 K and activation energies less than 0.9 eV. An impedance study confirms the formation of well-grown grains at higher sintering temperature.