Heat content of zirconium and of 5 compositions of zirconium hydride from 0°C to 900°C

Journal Article · Tue Jul 01 04:00:00 EDT 1958 · Journal of Research of the National Bureau of Standards

DOI:https://doi.org/10.6028/jres.061.002· OSTI ID:4287466

Douglas, T. B.; Victor, A. C.

Using a precise Bunsen ice calorimeter, a''silver core'' furnace, and a''drop'' method, the heat content (enthalpy) of zirconium metal and five samples of zirconium hydride (24 to 52 atomic percent hydrogen) was measured over the range 0°C to 900°C. Thermal hysteresis of the hydrides was investigated in several cases, and corrections were applied for the impurities in the samples. At each temperature up to 550 deg C the heat contents of the hydrides relative to 0°C were found to vary linearly with composition, a fact in accord with the phase diagram of the system. The effective heat capacity of each hydride sample reached its maximum value between 550° and 500°C, a behavior that can be interpreted as due to the endothermic formation of the high-temperature beta phase.

• Research Organization: Originating Research Org. not identified
• Sponsoring Organization: USDOE
• NSA Number: NSA-12-017466
• OSTI ID: 4287466
• Journal Information: Journal of Research of the National Bureau of Standards, Journal Name: Journal of Research of the National Bureau of Standards Journal Issue: 1 Vol. 61; ISSN 0091-0635
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALORIMETERS
ENTHALPY
IMPURITIES
MEASURED VALUES
METALS
PHASE DIAGRAMS
TEMPERATURE
THERMODYNAMICS
ZIRCONIUM
ZIRCONIUM HYDRIDES