THE ELECTRONIC SPECIFIC HEATS OF THE PSEUDO-BINARY SYSTEM TiFe$sub 2$- ZrFe$sub 2$

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1962

OSTI ID:4093239

Massena, C W

The electronic specific heats of 9 Laves phase alloys in the TiFe/sub 2/- - ZrFe/sub 2/ system were measured in the range 1.5 to 4 deg K. The measurements were conducted in a calorimeter, in which no He exchange gas was used and which employed a mechanical heat switch to remove heat from the sample at low temperatures. The samples were separed in 5 g quantities by levitation melting. A calorimetric sample consisted of many small pieces and required the use of a heat exchange medium for rapid achievement of thermal equilibrium. Glycerol was used for this purpose. Both the sample and the glycerol were placed in a container possessing a heater and a Ge thermometer. The heat capacity of the sample container and the glycerol were determined separately. The electronic specific heat coefficients for the 9 alloys were obtained from a least squares treatment of the heat capacity data. The density was determined froNonem these coefficients. Magnetic and phase studies that had been conducted previously indicated a hexagonal (TiFe/sub 2/ structure) paramagnetic phase and a cubic (ZrFe/sub 2/ structure) ferromagnetic phase separated by a 2-phase ferromagnetic region. The measurements confirmed the previously determined phase boundaries and indicated a maximum in the density of states in each of the 2 phases. The density of states was higher in the paramagnetic hexagonal phase (maximum 1.969 states/atom-ev,) than in the ferromagnetic cubic phase (maximum 0.656 states/atom ev). (Dissertation Abstr.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-18-008862
• OSTI ID: 4093239
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALCOHOLS
CALORIMETERS
DENSITY
FERROMAGNETIC MATERIALS
GERMANIUM
GLYCERIN
GRAIN BOUNDARIES
HEAT EXCHANGERS
HEAT TRANSFER
HELIUM
INTERMETALLIC COMPOUNDS
IRON ALLOYS
LOW TEMPERATURE
MAGNETISM
MEASURED VALUES
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
QUANTITATIVE ANALYSIS
SAMPLING
SPECIFIC HEAT
THERMOMETERS
TITANIUM ALLOYS
VESSELS
ZIRCONIUM ALLOYS