Transition metal iodates. V. Preparation and characterization of the smaller lanthanide iodates

• Published in: Journal of solid state chemistry Vol. 11; no. 4; pp. 314 - 318
• Main Authors: Nassau, K., Shiever, J.W., Prescott, B.E., Cooper, A.S.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 1974
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/S0022-4596(74)80036-8

The Ln(IO 3) 3 xH 2O compounds of Eu-Lu, including Y, were prepared by precipitation, thermal decomposition, and by crystallization from the gel, from ambient and boiling water, and from boiling HNO 3. Six groups of compounds were obtained and characterized by powder X-ray diffraction, DTA, TGA, and infrared spectroscopy. Two distinct structures with x=0 occur for the iodates; one occurs for Eu-Lu plus Y, and the other for Yb and Lu. Two distinct structures occur for x = 2; one occurs for Eu-Er plus Y, and the other for Tm-Lu. One structure with x = 4 occurs for Gd-Lu plus Y. An amorphous phase appears as an intermediate stage during the decomposition of the tetrahydrates. All of these phases (except the amorphous one) were prepared in single-crystal form and structural data will be reported elsewhere. Only the tetrahydrates have been previously reported; other compounds previously reported appear to have been mixtures.