Fully automated calorimeter for small samples with improved sensitivity

Regelsberger, M.; Wernhardt, R.; Rosenberg, M.

doi:10.1088/0022-3735/19/7/005

Cited by 20 publications

(5 citation statements)

References 14 publications

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“…I1 n'a pas 6t6 possible, non plus, d'aborder le probl6me de l'&alonnage des appareils qui est pourtant essentiel en calofim&rie, ni celui de l'automatisation. Ces sujets ont d'ailleurs 6t6 trait6s par Regelsberg et al [129] et par Hatem et al [130]. La calorim6trie est la partie la plus ancienne de la thermodynamique.…”

Section: Resultsunclassified

Determination calorimetrique des enthalpies de formation en metallurgie

Castanet

1989

Journal of Thermal Analysis

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The calorimetric methods used for the measurement of the enthalpy of formation of metallic systems are described and discussed. Special attention is paid to direct reaction calorimetry, dissolution calorimetry, precipitation calorimetry, combustion calorimetry.., and nonreacting calorimetry is considered as an additiorial method from this point of view. Emphasis is placed on thei r particular field of application. Some recent developments are given.

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Section: Resultsunclassified

Determination calorimetrique des enthalpies de formation en metallurgie

Castanet

1989

Journal of Thermal Analysis

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“…[6,7,8,9,10,11] With the development of lock-in-amplifiers, such nonadiabatic microcalorimetry techniques allow measuring the heat capacity of bulk crystals of a mass of typically 1 mg. Experimentalists favour two principal methods: the steady-state ac heating method (AC) [12,13,14] and the thermal-relaxation (TR) method. [6,7,8,15] Recently, a semi-adiabatic compensated heat-pulse (CHP) calorimeter has been developed, which requires an even weaker thermal link to the bath, compared to the TR method, and allows high precision data within a short measuring time. [16,17] The AC method has the advantage of providing heat capacity data as a continuous function of temperature, and it is therefore suitable, e.g., for studying phase transitions.…”

Section: Introductionmentioning

confidence: 99%

Development of a relaxation calorimeter for temperatures between 0.05 and 4 K

Brando

2009

Review of Scientific Instruments

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A detailed description of an isoperibol calorimeter for temperatures between 0.05 and 4 K is presented. The proposed setup can provide absolute values of the heat capacity C of small samples (typically 1 mg). The extremely simple design of the sample platform, based on a sapphire substrate, and the experimental setup, which makes use only of a lock-in amplifier and a temperature controller, make the construction of such a calorimeter easy and inexpensive. The thermal-relaxation method is employed, which utilizes a permanent thermal link k between the sample platform and the low-temperature bath. The temperature dependence of k(T) is shown for several platforms throughout the entire temperature range: k(T)/T is nearly constant down to 1 K, where it starts to decrease smoothly. The observed behavior is thoroughly explained by considering the thermal resistances of the platform constituents. A comparison between the values of k(T)/T for platforms based on sapphire and on silver is presented where no significant difference has been observed. Each platform can be assembled to have a particular value of k/T at 1 K. Since the sample relaxation time tau approximately C/k, k(T) can be adjusted to C(T) to give a reasonably fast measuring time. Here, it is demonstrated how this calorimeter can be used in so-called single-shot refrigerators ((3)He or demagnetization cryostats), where the time for a single measurement is limited. In addition, it can be used in moderate magnetic fields B

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“…[1][2][3][4][5][6][7] Sophisticated material processing techniques have, for example, reduced background contributions from addenda by several orders of magnitude, in systems which typically use ac or semiadiabatic relaxation modes for heating. [2][3][4][5][6][7] Unfortunately, the implementation of such advanced technologies requires use of special equipment that is often expensive and not readily available. Restrictions due to cost and limited access, have historically motivated users with limited resources to develop simplified systems with intermediate resolution, that can nevertheless provide useful data.…”

Section: Introductionmentioning

confidence: 99%

Relaxation calorimetry technique for measuring low temperature specific heat

Newsome

Andrei

2004

Review of Scientific Instruments

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A rudimentary calorimeter was constructed to measure the temperature dependence of the specific heat of a 10 thick ͑0.62 mg͒ copolymer film of vinylidene fluoride and trifluoroethylene in the previously unexplored vicinity of 6 K. The data were processed with the algorithm developed by Hwang et al. ͓Rev. Sci. Instrum. 68, 94 ͑1997͔͒ as modified for our configuration in which a Cernox thermometer also served as a heater. The measurements extended from 3.75 to 8.5 K, with a temperature resolution of 0.2 K, and the ratios of the statistical uncertainties to the mean values deduced for c p are Ϯ 3% over most of this temperature range. The data taken with the intermediate resolution of this calorimeter provides evidence for the absence of any slowly varying anomaly in the temperature dependence of c p. Such rudimentary systems provide a useful option to gather exploratory information at a comparatively low cost for components.

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Fully automated calorimeter for small samples with improved sensitivity

Cited by 20 publications

References 14 publications

Determination calorimetrique des enthalpies de formation en metallurgie

Determination calorimetrique des enthalpies de formation en metallurgie

Development of a relaxation calorimeter for temperatures between 0.05 and 4 K

Relaxation calorimetry technique for measuring low temperature specific heat

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