Synthesis of some new thorium phosphates

Abstract

Some thorium phosphates have been synthesised: caesium-thorium phosphate, barium-thorium phosphate, thorium fluoride phosphate, thorium sulphate phosphate, and thorium silicate phosphate, starting from aqueous solutions. Their chemical composition was established by Electron Probe Microanalysis (EPMA) and/or by Particle Induced X-ray Emission (PIXE). The X-rays diffraction patterns and/or the infrared spectra are given for these series of thorium phosphate.

Borosilicate and aluminosilicate pollucite nanocrystals for the storage of radionuclides

“…The borosilicate glass is the most common industrial solution used for the immobilization of high-level waste [5,6]. Moreover other ceramic type materials with different matrices have been used for a durable immobilization of radioactive cesium such as hollandite, perlite and several phosphates [7][8][9]. These ceramics were prepared using oxide, carbonate and nitrate powders with different cations (Al ) of increasing size, in order to evaluate the effect of composition on ceramics microstructure and structure and on cesium incorporation.…”

Chemistry of tetravalent actinide phosphates—Part II

“…Thorium bromide phosphate, Th 10 Br 4 (PO 4 ) 12 , was also synthesized in similar conditions [2]. Thorium fluoride phosphate ThFPO 4 Á H 2 O was obtained as a crystallized powder using hydrothermal synthesis from a mixture of thorium chloride, hydrofluoric acid, and phosphoric acid solutions [9]. Its XRD diagram was similar to that of…”

BaAnIV(PO4)2 (AnIV = Th, Np) – A New Family of Layered Double Phosphates

“…has been recently identified as an ordered derivative of cheralite. [32] Several authors [8,[33][34][35][36] have reported the existence of BaTh(PO 4 ) 2 , but its study and that of its derivatives is impeded by a complete lack of structural data. Even hypotheses concerning its crystal cell are divergent.…”