Review of Scientific Instruments · 1967 · 219 citations · 31 references
Natural SciencesChemistryMaterials ScienceAnalytical ChemistryMaterials CharacterizationThermodynamicsCalibrationCalorimetryHeat Capacity MeasurementTemperature MeasurementTemperature SensorsThermal Properties Of MaterialsHeat CapacityHeat Capacity CalibrationHeat Capacity DeterminationInstrument Calibration In CalorimetryResistance ThermometryTemperature Cycling StabilityTemperature Sensor SensitivityThermal Sensor Calibration
The authors calibrated platinum‑encapsulated germanium resistance thermometers for 1–25 K calorimetry using a cryogenic apparatus, fitted the data with a polynomial logR–logT relation, and validated the temperature scale by measuring the heat capacity of 99.99 %‑pure copper and comparing it with other laboratories. The thermometers exhibit sufficient sensitivity and temperature‑cycling stability for accurate low‑temperature calorimetry, and the authors present a copper heat‑capacity equation for 1–25 K to serve as a convenient reference for interlaboratory comparisons.
The cryogenic apparatus and techniques used to calibrate 3 platinum-encapsulated 4-lead germanium resistance thermometers for use in precision calorimetry from 1 to 25°K are described. The calibration data for each thermometer were fitted with the aid of a digital computer by a polynomial expressing logR in terms of powers of logT. The sensitivity and temperature-cycling stability of these thermometers were adequate to recommend this type of temperature sensor for accurate low temperature calorimetry. A test of the temperature scale and of an isothermal type calorimeter was made by measuring the heat capacity of a sample of 99.99+% copper from the 1965 Calorimetry Conference Copper Standard and comparing the results with those obtained by other investigators. An equation to represent the heat capacity of pure copper from 1 to 25°K, based upon appropriate literature results and the present data, is offered as a convenient copper reference equation for intercomparison of heat capacity results from various laboratories.
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Atomic Heats of Copper, Silver, and Gold from 1°K to 5°K
W. S. Corak, M. P. Garfunkel, C. B. Satterthwaite et al. · Physical Review · 1955 · 170 citations