Phase equilibria and structural species in NdCl[sub 3]-NaCl, NdCl[sub 3]-CaCl[sub 2], PrCl[sub 3]-NaCl, and PrCl[sub 3]-CaCl[sub 2] systems

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

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb05601.x· OSTI ID:7018654

Sharma, R A; Rogers, R A ^[1]

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1. General Motors Research Labs., Warren, MI (United States)

This paper reports that equilibrium phase diagrams for the systems NdCl[sub 3]---CaCl[sub 2] and NdCl[sub 3]---NaCl were determined by differential thermal analysis. A simple eutectic was observed at 59 [plus minus] 1 mol% CaCl[sub 2] and 600[degrees] [plus minus] 2 [degrees]C in the NdCl[sub 3]---CaCl[sub 2] system. A compound NaCl [center dot] 3NdCl[sub 3] which melts incongruently at 545[degrees] [plus minus] 5[degrees]C to NdCl[sub 3] and a liquid containing approximately 47 mol% NaCl, and a eutectic at 68 mol% NaCl and 439[degrees] [plus minus] 2[degrees]C were found in the NdCl[sub 3]---NaCl system. On the basis of agreements between the activities calculated by the Clausius-Clapeyron equation and Temkin's model using the present data for the NdCl[sub 3]---CaCl[sub 2] system and the literature data for the PrCl[sub 3]---CaCl[sub 2] system, the melts in the former system consist of Nd[sup 3+], Ca[sup 2+], and Cl[sup [minus]] ions and in the latter system of Pr[sup 3+], Ca[sup 2+], and Cl[sup [minus]] ions. The above approach indicates the presence of Na[sup +], Cl[sup [minus]], and NdCl[sub 4][sup [minus]] in the NdCl[sub 3]-rich melts in the NdCl[sub 3]--NaCl system.

• OSTI ID: 7018654
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:9; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHLORIDES
CHLORINE COMPOUNDS
DIAGRAMS
DIFFERENTIAL THERMAL ANALYSIS
EQUATIONS
EQUILIBRIUM
HALIDES
HALOGEN COMPOUNDS
NEODYMIUM CHLORIDES
NEODYMIUM COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
PRASEODYMIUM CHLORIDES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SODIUM CHLORIDES
SODIUM COMPOUNDS
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES