• Kozlova, Taisiya
• Ivanov, Vladimir
• Gippius, Andrei A.
• Istomin, Sergey
• Baranchikov, Alexander
• Mironov, Andrey V.

Abstract

<jats:title>Abstract</jats:title><jats:p>A previously unknown double ceric sodium phosphate hydrate Na<jats:sub>1.97</jats:sub>Ce<jats:sub>1.03</jats:sub>(PO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> ⋅ <jats:italic>x</jats:italic>H<jats:sub>2</jats:sub>O containing both ceric and cerous cations was obtained by the hydrothermal treatment of amorphous ceric phosphate mixed with a sodium hydroxide aqueous solution. The presence of Ce<jats:sup>3+</jats:sup> in the structure was proved by HERFD‐XANES and ESR spectroscopy. Iterative transformation factor analysis of HERFD‐XANES data allowed estimating the content of Ce<jats:sup>3+</jats:sup> as 10 % of the total cerium. Water content of <jats:italic>x</jats:italic>=0.55 has been determined by thermogravimetric analysis combined with mass‐spectrometry data. The structure of the compound was solved from powder X‐ray diffraction data (S.G. <jats:italic>P</jats:italic>2<jats:sub>1</jats:sub><jats:italic>/c a</jats:italic>=6.9441(2) Å, <jats:italic>b</jats:italic>=11.6805(3) Å, <jats:italic>c</jats:italic>=9.3434(3) Å, <jats:italic>β</jats:italic>=111.6827(18)°). The new ceric sodium phosphate hydrate has a tunnel structure, where Ce<jats:sup>3+</jats:sup> cations most likely partially occupy Na<jats:sup>+</jats:sup> positions. The crystal structure of the novel compound has no direct analogues among the crystal structures of double tetravalent metal phosphates.</jats:p>

Topics

• compound
• amorphous
• Sodium
• thermogravimetry
• electron spin resonance spectroscopy
• spectrometry
• Cerium