Radiotracer study of the preparation of high-purity lanthanum fluoride

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb04225.x· OSTI ID:7237539

Ewing, K J; Jaganathan, J; Peitersen, L; Aggarwal, I D ^[1]; Sommers, J A; Fahey, J V ^[2]

---

1. Naval Research Lab., Code 6505, Washington, DC (US)
2. Teledyna Wah Chang Albany, Albany, OR (US)

This paper reports that the behavior of the impurities iron, cobalt, yttrium, and cerium is determined via radiotracer techniques for the preparation of high-purity lanthanum fluoride. The behavior of nickel and copper during the coprecipitation of a lanthanum nitrate solution is determined by graphite furnace atomic absorption spectrometric (GFAAS) analysis. There is no commercially available radiotracer for neodymium, a key impurity associated with absorption losses in fluoride glasses. However, the chemical behavior of neodymium and that of yttrium are very similar and, therefore, it is reasonable to assume that the behavior of yttrium throughout the processing is indicative of the behavior of neodymium. The concentrations of impurities in lanthanum nitrate, carbonate, and fluoride are estimated using the radiotracer and GFAAS data for each processing step. Results indicate that while high-purity lanthanum carbonate can be prepared, any impurities present in the lanthanum carbonate will be carried quantitatively into lanthanum fluoride upon hydrofluorination.

• OSTI ID: 7237539
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 75:6; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LANTHANUM FLUORIDES
CHEMICAL PREPARATION
LANTHANUM NITRATES
COPRECIPITATION
ABSORPTION SPECTROSCOPY
CERIUM
COBALT
COPPER
GLASS
IMPURITIES
IRON
NEODYMIUM
NICKEL
STRUCTURAL CHEMICAL ANALYSIS
TRACER TECHNIQUES
YTTRIUM
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
ISOTOPE APPLICATIONS
LANTHANUM COMPOUNDS
METALS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PRECIPITATION
RARE EARTH COMPOUNDS
RARE EARTHS
SEPARATION PROCESSES
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties