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Thermal expansion behavior at high temperatures of synthesizedNa$_{1-x}$Zr$_2$(PO$_4$)$_{3-x}$(XO$_4$)$_x$, andCa$_{1-x}$Zr$_2$(PO$_4$)$_{3-x}$(XO$_4$)$_x$, X = Mo, W compounds has beeninvestigated. Ceramics with relatively high density (more than 97.5%) wereproduced by Spark Plasma Sintering (SPS) of submicron powders obtained bysol-gel synthesis. The study of strength characteristics has revealed thathardness the ceramics are greater than 5 GPa, and minimum fracture toughnessfactor was 1 MPa*m$^{1/2}$. It was found that ceramics have a high hydrolyticresistance in the static regime -- the minimum leaching rates for the Mo- andW-containing specimens were $31\times10^{-6}$ and $3.36\times 10^{-6}$g/(cm$^2$*day), respectively. The ceramics had a high resistance to theirradiation by Xe$^{+26}$ multiple-charged ions with the energy 167 MeV up tothe fluences in the range 1*10$^{12}$ - 6*10$^{13}$ cm$^{-2}$. TheMo-containing Na$_{0.5}$Zr$_2$(PO$_4$)$_{2.5}$(XO$_4$)$_{0.5}$ ceramics wereshown to have a higher radiation resistance that the phosphate-tungstates.

Synthesis and study of (Na, Zr) and (Ca, Zr) phosphate-molybdates and  phosphate-tungstates: Thermal expansion behavior, radiation test and  hydrolytic stability