THE NICKEL CHLORIDE-CESIUM CHLORIDE PHASE DIAGRAM. TETRAHEDRAL NiCl ₄ = ION IN THE NEW COMPOUND Cs ₃ NiCl ₅ ¹

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100807a013· OSTI ID:4818866

Iberson, E.; Gut, R.; Gruen, D. M.

The phase diagram of the nickel chloride-cesium chloride binary system was investigated by differential thermal analysis. The system exhibits two congruently melting compounds, CsNiCl/sub 3/ (m.p. 758 deg ) and Cs/sub 3/NiCl/ sub 5/ (m.p. 547 deg ) as well as three eutectic points at 522, 54l, and 747 deg . These correspond to the compositions 19, 27, and 55 mole% NiCl/sub 2/. The blue compound Cs/sub 3/NiCl/sub 5/ is isomorphous with nsition ion is surrounded by four chloride ions in a tetrahedral arrangement. At 4l7 , Cs/sub 2/NiCl/ sub 5/ decomposes in the solid state to CsCl and yellow CsNiCl/sub 3/ in which nickel is coordinated octahedrally. Qualitative considerations show that octahedral crystal field stabilization energies play an important role in determining phase stability in the CsClNiCl/sub 2/ system as well as in the other known CsCl-MCl/sub 2/ systems. The stereochemistry of the chlorine coordination polyhedra in complex chlorides of the transition elements is discussed in the light of crystal field theory and JahnTeller distortions. (auth)

• Research Organization: Argonne National Lab., Ill.
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-007561
• OSTI ID: 4818866
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 1 Vol. 66; ISSN 0022-3654
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALLOTROPY
CESIUM CHLORIDES
CHEMISTRY
COBALT CHLORIDES
CONFIGURATION
CRYSTALS
ENERGY LEVELS
EUTECTICS
EXPANSION
FIELD THEORY
FUSED SALTS
JAHN-TELLER EFFECT
LATTICES
MOLECULES
NICKEL CHLORIDES
PHASE DIAGRAMS
STABILITY
THERMAL ANALYSIS
TRANSITION METALS