Nitrate (chloride) melts as media for crystal growth of complex phosphates of alkali and trivalent metals

• Published in: Journal of crystal growth 2016-01, Vol.434, p.30-35
• Main Authors: Livitska, Oksana, Strutynska, Nataliia, Zatovsky, Igor, Slobodyanik, Nikolai, Odinets, Eugen
• Format: Article
• Language: English
• Subjects: A1. Characterization; A1. SEM; A1. TG/DTA; Aluminum; B1. Complex phosphate; B1. Salt melts; Chlorides; Crystal growth; Iron; Melts (crystal growth); Optical microscopy; Phosphates; X-rays
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2015.10.023

The interaction in the molten systems MIPO3-MIII2O3-MINO3 (MICl) (MI – Na, K; MIII – Al, Fe, Y, Bi) was investigated at molar ratios P/MIII=1 or 3 at the temperatures 400°C (for MINO3) or 810°C (for MICl). Formation conditions of complex phosphates MI3MIII2(PO4)3 and MI3MIII(PO4)2 (MI – Na, K; MIII – Al, Fe, Bi) were established. It was shown that the crystal size of obtained phosphates can be controlled by using different salt melts. The synthesized compounds were characterized using powder X-ray diffraction, Fourier transform infrared spectroscopy, Optical microscopy and Scanning electron microscopy with Energy-dispersive X-ray spectroscopy. Differential thermal data for Na3Bi(PO4)2 and Na3Fe(PO4)2 showed congruent and incongruent melting, respectively. •The interaction in the systems MIPO3-MIII2O3-MINO3(MICl) was investigated.•The influence of MI and MIII on products phase composition was established.•Obtained phosphates were studied by XRPD, FTIR, SEM/EDX and TG/DTA methods.•Advantages of used approach are reduction of synthesis time and temperature.