Thermodynamics of several Lewis-acid-base stabilized transition metal alloys
High-temperature (1425 to 2750 K) thermodynamic activities of one or both components of twentyfive binary alloys of a group IVB-VIB element (Ti, Zr, Hf, Nb, Ta, or W) with a platinum group element (Ru, Os, Ir, Pd, Pt, or Au) have been determined by equilibrating the alloy with the appropriate carbide and graphite, equilibrating with the nitride and nitrogen gas, or measuring th partial vapor pressure(s) thermogravimetrically or mass spectrometrically. The extraordinary stability of this class of transition metal alloy is attributed to a generalized Lewis-acid-base interaction involving valence d electrons, and the results of these investigations are interpreted within the context of this effect. Among the conclusions made are that a non-spherically-symmetrical crystal field significantly reduces the bonding effectiveness of certain valence d orbitals; the effect of the extent of delocalization of these orbitals is also considered.
- Research Organization:
- Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Chemistry, University of California, Berkeley
- OSTI ID:
- 5266052
- Journal Information:
- Metall. Trans., A; (United States), Vol. 15A:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLATINUM METAL ALLOYS
THERMODYNAMIC ACTIVITY
TRANSITION ELEMENT ALLOYS
BINARY ALLOY SYSTEMS
BINDING ENERGY
CARBIDES
CRYSTAL FIELD
ELECTRONS
GRAPHITE
LEWIS ACIDS
MASS SPECTRA
NITRIDES
NITROGEN
STABILITY
THERMAL GRAVIMETRIC ANALYSIS
VALENCE
VAPOR PRESSURE
VERY HIGH TEMPERATURE
ALLOY SYSTEMS
ALLOYS
CARBON
CARBON COMPOUNDS
CHEMICAL ANALYSIS
ELEMENTAL MINERALS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
FERMIONS
GRAVIMETRIC ANALYSIS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LEPTONS
MINERALS
NITROGEN COMPOUNDS
NONMETALS
PHYSICAL PROPERTIES
PNICTIDES
QUANTITATIVE CHEMICAL ANALYSIS
SPECTRA
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES
360104* - Metals & Alloys- Physical Properties