The synthesis and crystal structures of the first rare-earth alkaline-earth selenite chlorides MNd 10(SeO 3) 12Cl 8 ( M=Ca and Sr)

• Published in: Journal of solid state chemistry Vol. 180; no. 11; pp. 3019 - 3025
• Main Authors: Berdonosov, P.S., Olenev, A.V., Dolgikh, V.A., Lightfoot, P.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 2007
• Subjects: Crystal structure; Rare earth compound; Selenite chloride; Selenite chloride; Rare earth compound; Crystal structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2007.08.019

Two new alkaline-earth Nd selenite chlorides MNd 10(SeO 3) 12Cl 8 ( M=Ca, Sr) were obtained using crystal growth from alkaline-earth chloride melts in quartz tubes. These new compounds crystallize in the orthorhombic system in space group C cca (#68). The compounds were studied by energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction. It was shown that both compounds adopt the same structure type, constructed by complex [M 11(SeO 3) 12] 8+ slabs separated by chloride anion layers perpendicular to the longest cell parameter. The SeO 3 groups show a pyramidal shape and may be described as SeO 3E tetrahedra. Such SeO 3 groups decorate the Nd–O skeletons forming the [M 11(SeO 3) 12] 8+ slabs. Two new alkaline-earth Nd selenite chlorides MNd 10(SeO 3) 12Cl 8 ( M=Ca, Sr) were synthesized. These structures are constructed by [M 11(SeO 3) 12] 8+ slabs separated by chloride anion layers.