AN INVESTIGATION OF THE PHASE-DIAGRAM PALLADIUM-ARSENIC IN CONNECTION WITH SUPER-CONDUCTIVITY

Journal Article · Sat Jun 01 04:00:00 EDT 1963 · J. Less-Common Metals

DOI:https://doi.org/10.1016/0022-5088(63)90032-8· OSTI ID:4701964

Raub, Ch J; Webb, G W

The phase-diagram Pd-- As was investigated by thermal, rontgenographic, and metallographic analysis, together with superconductivity raeasurements. The existence of five phases, three of them previously unknown, was established. Addition of arsenic to palladium causes a sharp drop of the liquidus curve. At 770 deg C the compound Pd/sub 7/As formed peritectically. Increasing the amounts of As causes the eutectic at 20 at.% As (715 deg C) to be followed by a peritectic reaction (820 deg C) between liquid and the congruently raelting compound Pd/sub 5/As/sub 2/ (860 deg C), forming Pd/sub 3/As. At 33 at. % As the peritectically formed phase Pd/sub 2/As (728 deg C), which transforms at 485 deg C into a low, temperature modification exists. The homogeneity range of PdAs/ sub 2/ was found not to be as broad as claimed earlier. Three of the compounds are superconductors: Pd/sub 5/As/sub 2/ (T/sub c/ = 0.46 deg K), Pd/sub 2/A s h.t. (T/sub c/= 1.71 deg K) and Pd/sub 2/As l.t. (T/sub c/ = 0.60 deg K). (auth)

• Research Organization: Univ. of California, San Diego
• NSA Number: NSA-17-029354
• OSTI ID: 4701964
• Journal Information: J. Less-Common Metals, Journal Name: J. Less-Common Metals Vol. Vol: 5
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ARSENIC
ARSENIC COMPOUNDS
EUTECTICS
HIGH TEMPERATURE
LOW TEMPERATURE
MEASURED VALUES
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
PALLADIUM COMPOUNDS
PHASE DIAGRAMS
QUANTITY RATIO
SUPERCONDUCTIVITY
TEMPERATURE
THERMODYNAMICS
X RADIATION