The generalized Lewis acid-base titration of palladium and niobium
The high thermodynamic stability of alloys composed of platinum group metals and group IVB and VB metals has been explained by an electronic interaction analogous to the Lewis acid-base concept for nontransition elements. The analogy is further demonstrated by the titration of palladium by addition of niobium. The activity of niobium in solid palladium was measured as a function of concentration by solid-state galvanic cells and study of the ternary oxide phase diagram. The galvanic cells were of the Pt/NbO/sub 2/, Nb/sub 2/O/sub 4.8//YDT/NbO/sub y/, Nb/sub (Pd)//Pt where the solid electrolyte is yttria-doped thoria (YDT). Ternary phase diagrams for the Pd-Nb-O and Rh-Nb-O systems were obtained by characterizing samples equilibrated at 1000/sup 0/C. The phase relationships found in the ternary diagrams were also used to derive thermochemical data for the alloys. Thermochemical quantities for other acid-base stabilized alloys such as Nb-Rh, Ti-Pd, and Ti-Rh were also measured.
- Research Organization:
- 9501197; 1097000
- OSTI ID:
- 6053035
- Journal Information:
- Metall. Trans., B; (United States), Vol. 19B:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NIOBIUM OXIDES
THERMODYNAMICS
PALLADIUM ALLOYS
TERNARY ALLOY SYSTEMS
PHASE DIAGRAMS
CHEMICAL REACTIONS
ELECTRONIC STRUCTURE
LEWIS ACIDS
LEWIS BASES
METALLURGY
PLATINUM
RHODIUM
SOLID ELECTROLYTES
SOLID-STATE PLASMA
STABILITY
THEORETICAL DATA
TITANIUM ALLOYS
ALLOY SYSTEMS
ALLOYS
BASES
CHALCOGENIDES
DATA
DIAGRAMS
ELECTROLYTES
ELEMENTS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
METALS
NIOBIUM COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLASMA
PLATINUM METAL ALLOYS
PLATINUM METALS
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties
360204 - Ceramics
Cermets
& Refractories- Physical Properties
400201 - Chemical & Physicochemical Properties