A new approach for the preparation of nanoscale copper‐ and zinc‐containing sodium‐ and carbonate‐substituted apatites is presented. The thermal transformations of the samples in the temperature range 80–1000 °C were determined by temperature‐programmed desorption mass spectroscopy and thermogravimetry. The chemical and phase compositions of the copper‐ and zinc‐containing sodium‐ and carbonate‐substituted apatites were studied by atomic absorption spectroscopy and X‐ray diffraction, respectively. The degree and nature of the carbonate substitution were determined by elemental analysis (C, H, N) and infrared spectroscopy, respectively. In addition, scanning electron microscopy (SEM) showed nanoparticles (about 10–20 nm in diameter) with a stability to aggregation under processes by microwave radiation. Samples annealed at 700 °C were crystalline and had an apatite structure.
The Double Phosphates M I M II PO4 (M I : Na, K; M II : Mg, Mn, Co, Ni, Zn) -Synthesis from Chloride Melts and Characterization. -Interactions in the systems M I PO3-M II O (or Mn2O3)-M I Cl (M I : Na, K; M II : Mg, Co, Ni, Zn) are investigated at molar ratios P/M x = 1 or 2, and M I Cl/(M I PO3 + M II O) = 30 (porcelain crucibles, 1073 K, 3-5 h). The samples are characterized by powder XRD, FTIR spectroscopy, and UV/VIS diffuse reflectance spectroscopy. The main advantages of the synthesis of the title compounds from chloride melts are synthesis time reduction, reduced reaction temperature, and the possibility of crystal size control. -(LIVITSKA*, O. V.; STRUTYNSKA, N. Y.; ZATOVSKY, I. V.; SLOBODYANIK, N. S.; Cryst. Res. Technol. 50 (2015) 8, 626-632, http://dx.
The particularities of the chemical interaction in systems MIPO3‐MIIO(or Mn2O3)‐MICl (MI – Na, K; MII – Mg, Co, Ni, Zn) have been investigated at the temperature 1073 K and molar ratios P/Mx = 1 or 2 and MICl/(MIPO3 + MIIO(or Mn2O3)) = 30. The conditions of formation of complex phosphates MІMIIPO4 and Na4Ni3(PO4)2P2O7 have been found. Influences of the nature of alkali and bivalent metals on the products composition were discussed. The advantages of chloride melts using (synthesis time reduction and temperature reducing) for preparing of complex phosphates were shown. The synthesized compounds have been characterized using the powder X‐ray diffraction, Fourier transform infrared and diffuse reflectance spectroscopies.
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