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Calorimeter

About: Calorimeter is a research topic. Over the lifetime, 5878 publications have been published within this topic receiving 77157 citations.


Papers
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Journal ArticleDOI
TL;DR: A micro-combustion calorimeter suitable for samples of mass about 10 mg to 50 mg is described in this article, where the energy equivalent e° = (1809.82 ± 0.28) J·K−1.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the enthalpies of formation of NiAl as a function of composition determined by two different calorimetric techniques are compared, and the results are also compared to enthalpy of formation data for the stoichiometric alloy from several other sources.
Abstract: NiAl and NiAl based ternary metallic systems have attracted much attention in recent years for potential use as high temperature structural materials [1–6]. Alloy development of such systems requires a thorough knowledge of the phase equilibria and thermodynamics of the systems. Using high temperature calorimeters [7–9], the enthalpies of formation for many alloy systems have been measured and the results incorporated into thermodynamic databases for modeling of their phase diagrams using software such as Thermocalc©R [10]. However, there exists some confusion regarding the value for the enthalpy of formation of NiAl. In one reference [11], comparison of published experimental data was made which are referred to different standard states, with the consequent conclusion that there is a wide discrepancy in the experimental NiAl data. In this paper, the enthalpies of formation of NiAl as a function of composition determined by two different calorimetric techniques are compared. The results are also compared to enthalpy of formation data for the stoichiometric alloy from several other sources. Two kinds of calorimeters are widely used in measuring the enthalpies of formation of intermetallic compounds with high melting points: the differential solution calorimeter and the direct synthesis calorimeter. The former is an indirect method because the compound is prepared before the enthalpy of formation is determined, while the latter is a direct one since the enthalpy of formation is determined during alloy formation. Using the differential solution calorimeter, Henig and Lukas [12] determined the enthalpy of formation of NiAl at 1100 K. During their experiment, the element Ni and the compound NiAl were dropped into the liquid aluminum separately and their heat of dissolution were measured in turn. The reactions involved in the measurement are:

36 citations

Journal ArticleDOI
TL;DR: In this paper, the design and properties of a double twin heat conduction microcalorimeter are described and the cross-talk between the calorimeters can be made low; they measured < 0.1% of the signal generated in one calorimeter in the other.

36 citations

Journal ArticleDOI
TL;DR: In this article, a high-pressure vibrating tube densimeter was used to study the behavior and influence of temperature and pressure on the isothermal compressibility and the isobaric thermal expansivity of iso-octane and 1-butanol.

36 citations

Journal ArticleDOI
TL;DR: In this article, a power-compensated membrane-based calorimeter that can maintain linear heating rates spanning 1-1000 K/s under nonadiabatic conditions is presented.
Abstract: With the goal of measuring the heat released or absorbed during phase transitions occurring in small samples, we have developed a power-compensated membrane-based calorimeter that can maintain linear heating rates spanning 1–1000 K/s under nonadiabatic conditions. The device works in the intermediate range of heating rates between conventional, β β > 10 4 K/s, scanning calorimeters. Active control in real time during heating/cooling experiments is achieved using the NI-7831 card, which includes a 1 M field programmable array with a control loop timer of 20 μs. The performance capabilities of the instrument are demonstrated using a case study: the melting of 100-nm-thick In films. A dynamic sensitivity below 1 μJ is currently achieved. We show that under the present development, heating rates above 200–300 K/s in ambient gas result in a widening of the melting peak because of uncompensated thermal effects. Power loss corrections are applied to obtain the heat capacity of the sample and therefore correct enthalpy values of the transition.

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20224
202193
2020142
2019113
2018150
2017160