NaRe$_2$(PO$_4$)$_3$ phosphate-based ceramic with kosnarite structure as a matrix for technetium immobilization. Production. Properties

TL;DR

This study presents the synthesis and characterization of a NaRe$_2$(PO$_4$)$_3$ ceramic with kosnarite structure, demonstrating its potential for immobilizing technetium through low leaching rates and suitable density.

Contribution

It introduces a novel ceramic matrix for technetium immobilization using spark plasma sintering and investigates its leaching behavior.

Findings

Ceramic achieved 85% relative density.

Leaching rate of rhenium was $1.3\times10^{-5}$ g/(cm$^2$*day).

Mechanism of Re leaching was analyzed.

Abstract

NaRe$_2$(PO$_4$)$_3$ phosphate-based ceramic with the structure of kosnarite mineral was obtained by spark plasma sintering. Rhenium (Re) served as a chemical and structural analog of technetium. The ceramic relative density was 85%. The mechanism of Re static leaching from NaRe$_2$(PO$_4$)$_3$ ceramic at room temperature was investigated. The leaching rate of rhenium was $1.3\times10^{-5}$ g/(cm$^2$*day).