1. Synthesis and study of (Na, Zr) and (Ca, Zr) phosphate-molybdates and phosphate-tungstates: Thermal expansion behavior, radiation test and hydrolytic stability
- Author
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Karaeva, M. E., Savinykh, D. O., Orlova, A. I., Khainakov, S. A., Nokhrin, A. V., Boldin, M. S., Garcia-Granda, S., Murashov, A. A., Chuvildeev, V. N., Skuratov, V. A., Kirilkin, N. S., Yunin, P. Yu., and Tabachkova, N. Yu.
- Subjects
Condensed Matter - Materials Science - Abstract
Thermal expansion behavior at high temperatures of synthesized Na$_{1-x}$Zr$_2$(PO$_4$)$_{3-x}$(XO$_4$)$_x$, and Ca$_{1-x}$Zr$_2$(PO$_4$)$_{3-x}$(XO$_4$)$_x$, X = Mo, W compounds has been investigated. Ceramics with relatively high density (more than 97.5%) were produced by Spark Plasma Sintering (SPS) of submicron powders obtained by sol-gel synthesis. The study of strength characteristics has revealed that hardness the ceramics are greater than 5 GPa, and minimum fracture toughness factor was 1 MPa*m$^{1/2}$. It was found that ceramics have a high hydrolytic resistance in the static regime -- the minimum leaching rates for the Mo- and W-containing specimens were $31\times10^{-6}$ and $3.36\times 10^{-6}$ g/(cm$^2$*day), respectively. The ceramics had a high resistance to the irradiation by Xe$^{+26}$ multiple-charged ions with the energy 167 MeV up to the fluences in the range 1*10$^{12}$ - 6*10$^{13}$ cm$^{-2}$. The Mo-containing Na$_{0.5}$Zr$_2$(PO$_4$)$_{2.5}$(XO$_4$)$_{0.5}$ ceramics were shown to have a higher radiation resistance that the phosphate-tungstates., Comment: 46 pages, 17 figures
- Published
- 2021