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

M. E. Karaeva; D. O. Savinykh; A. I. Orlova; S. A. Khainakov; A. V. Nokhrin; M. S. Boldin; S. Garcia-Granda; A. A. Murashov; V. N. Chuvildeev; V. A. Skuratov; N. S. Kirilkin; P. Yu. Yunin; N. Yu. Tabachkova

paper

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

arXiv:2112.00373

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 $31 \times 1 0^{- 6}$ and $3.36 \times 1 0^{- 6}$ 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.

46 pages, 17 figures