Structure of nanoparticles in the ZrO$_{2}$-Y$_{2}$O$_{3}$ system, as obtained under hydrothermal conditions

It is shown that monocrystalline nanoparticles with fluorite structure are formed in the ZrO$_{2}$-Y$_{2}$O$_{3}$ system, under hydrothermal conditions. The limiting content of Y$_{2}$O$_{3}$ in the nanocrystals based on zirconium dioxide is 21.7–22.6 mol.%. Yttrium oxide not included in the structure forms an amorphous phase, which is stable even upon thermal treatment at 1000–1300$^{\circ}$C. It has been found that under hydrothermal conditions the structure of the nanocrystals based on ZrO$_{2}$(Y$_{2}$O$_{3}$) solid solution includes water, its content depending on yttrium oxide concentration in the solid solution.