Compounds in Ca10(PO4)6Cl2–Pb10(PO4)6Cl2 system were synthesized by solid state reaction. It was ascertained using DTA and X-ray diffraction methods that in the investigated system there are two fields because of the formation a compound with formula Ca7Pb3(PO4)6Cl2. The first area is the Pb10(PO4)6Cl2–Ca7Pb3(PO4)6Cl2 which is characterized by unbounded mixing of components. The second Ca7Pb3(PO4)6Cl2–Ca10(PO4)6Cl2 area has complicated character due to presence of decomposition processes. In spite of the presence of the one nature polymorphic transitions of Ca10(PO4)6Cl2 and Pb10(PO4)6Cl2 the same effects on all solid solutions were not observed.
Thermochimica Acta. – 2011. – V. 526. – P. 72-77.

Compounds of composition Pb5(PO4)3FxCl1−x (0≤x≤1), which are synthetic analogues of minerals pyromorphite, flourapatite, and endlichite, were synthesized for the first time by high-temperature solid phase reactions. X-ray diffraction and IR spectroscopy were used to determine the structure of the compounds and revealed complete miscibility in the solid phase of the Pb5(PO4)3F–Pb5(PO4)3Cl binary system. Adiabatic reaction calorimetry was used to measure standard enthalpies of mixing and formation and show that the regular solutions model is applicable to the Pb5(PO4)3F–Pb5(PO4)3Cl system. Differential thermal analysis in tandem with high-temperature X-ray diffraction were used to study the phase diagram and characterize phase transitions.
Thermochimica Acta. – 2011. – V. 513. – P. 112-118.