Messungen der spezifischen W�rme von Wolfram zwischen 90 und 26000 abs

Zwikker, C.

doi:10.1007/bf01369650

Cited by 27 publications

(5 citation statements)

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“…Similar results could be obtained for wire diameters greater than 0 ·005 cm if p were appropriately reduced, which could be done with a suitably designed alternator (see e.g. Zwikker 1928). …”

Section: Theory (A) Oorbino'8 Expres8ion and Its Application To Tsupporting

confidence: 66%

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The Specific Heat of Metals Between 1200°K and 2400°K

Lowenthal¹

1963

Aust. J. Phys.

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SummarySpecific heat measurements have been made on niobium (from 1471 to 2260 0 K), molybdenum (from 1288 to 2015°K), tantalum (from 1256 to 2300 0 K), and tungsten (from 1267 to 2410 0 K). The experiments were based on a theory first proposed by Corbino in 1911. It is demonstrated that methods based on this theory account for heat losses from the specimen under test to better than 0'5% even at 2400oK. The theory requires a knowledge of the temperature oscillations in thin a.c. heated filaments and this amplitude is here obtained from photoelectric measurements.The measured specific heat of each one of the four metals was found to rise more than linearly with the absolute temperature,while the specific heat at constant volume was found to increase approximately with the first power of the temperature. This behaviour is briefly discussed.

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Section: Theory (A) Oorbino'8 Expres8ion and Its Application To Tsupporting

confidence: 66%

“…(iv) A method based on a theory published by Corbino (1911). So far this method appears to have been used only for tungsten, first by Smith and Bigler (1922), then by Bockstahler (1925), and last by Zwikker (1928).…”

Section: ·5mentioning

confidence: 99%

The Specific Heat of Metals Between 1200°K and 2400°K

Lowenthal¹

1963

Aust. J. Phys.

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“…Modulation calorimetry [1,2] was introduced by Corbino and consisted of measuring the temperature modulation through the oscillations of the electrical resistance in metal filaments fed by an alternating electrical current. By this method he measured the specific heat of tungsten as did others later on by similar methods [3][4][5][6][7]. Other methods of modulated calorimetry were developed [8,9], including the so-called temperature-modulated dierential scanning calorimetry [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Complex heat capacity and entropy production of temperature modulated systems

Oliveira¹

2019

J. Stat. Mech.

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Non-equilibrium systems under temperature modulation are investigated in the light of the stochastic thermodynamics. We show that, for small amplitudes of the temperature oscillations, the heat flux behaves sinusoidally with time, a result that allows the definition of the complex heat capacity. The real part of the complex heat capacity is the dynamic heat capacity, and its imaginary part is shown to be proportional to the rate of entropy production. We also show that the poles of the complex heat capacity are equal to imaginary unit multiplied by the eigenvalues of the unperturbed evolution operator, and are all located in the lower half plane of the complex frequency, assuring that the Kramers-Kronig relations are obeyed. We have also carried out an exact calculation of the complex heat capacity of a harmonic solid and determined the dispersion relation of the dynamic heat capacity and of the rate of entropy production.

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“…The heat capacities of tungsten have been measured by LANCE [22] between 26 ~ and 91 ~ and by ZWIKKER [23] above 100 ~ The more recent measurements of CLUSmS and FRAiNZOSINI [24] ate in approximate agreement with those of LArr162 [22] and ZWIKKER [23]. The value of 7, the coefficient of the electronie specific heat term, reported by different workers varies within Yery wide limits.…”

Section: (2) Tungstenmentioning

confidence: 59%

Vibration spectra and debye temperatures of transition metals

Sangal

Sharma

1970

Acta Physica

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The vibration spectra and specific heats of three body-centred cubic transition metals, ~-iron, tungsten and molybdenum have been calculated from BHATIA'S model of electronlattice interaction by considering second neighbour inter-ionie interactions. The force constants ate determined from the experimental elastie constants and one measured frequency. The calculated specific heats are compared with the available experimental data by computing the equivalent Debye temperature asa function of temperature and the agreement with experiment is reasonably satisfactory.

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Messungen der spezifischen W�rme von Wolfram zwischen 90 und 26000 abs

Cited by 27 publications

References 0 publications

The Specific Heat of Metals Between 1200°K and 2400°K

The Specific Heat of Metals Between 1200°K and 2400°K

Complex heat capacity and entropy production of temperature modulated systems

Vibration spectra and debye temperatures of transition metals

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