Study on a dynamic adiabatic calorimeter. II. Adiabatic scanning calorimeter and some applications

Naito, Kunihiko; Inaba, Hideaki; Ishida, Masashi; Saito, Yuki; Arima, Hiro

doi:10.1088/0022-3735/7/6/020

Cited by 24 publications

(2 citation statements)

References 13 publications

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“…A double adiabatic scanning calorimeter (ASC) is shown in Figure 5.3 [1,4]. The calorimeter is designed for the measurement of absolute enthalpy change of phase transition at high temperatures, using a relatively small amount of sample (3-10 g).…”

Section: Adiabatic Scanning Calorimetrymentioning

confidence: 99%

Heat Capacity of Solids

Tsuji

2010

Thermodynamic Properties of Solids

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Each atom in solids oscillates about its equilibrium position over a wide range of frequencies from zero up to a maximum value, and the conduction electrons in metals are freely mobile in solids. The oscillation of atoms and movement of electrons contribute to the internal energy of solids. When we heat a sample, solids absorb heat, and some of the phonons and electrons are excited thermally, so the internal energy of solids is expected to increase. The increase in internal energy due to lattice vibration of atoms and kinetic energy of free electrons in solids can attribute to the increase in heat capacity.Heat capacity of solids is usually measured at constant pressure and defined aswhere H is the enthalpy, T is the absolute temperature, and P is the pressure. Heat capacity at constant pressure is one of the indispensable thermodynamic quantities to obtain the free energy function of solids. By using the thermodynamic quantities at the reference temperature q, the free energy function (fef) of solids at temperature T is given as follows: 2Þ where G 0 T is the standard Gibbs energy at the absolute temperature T and H 0 q is the standard enthalpy at the reference temperature q. From heat capacity data as a function of temperature in the temperature range from q to T, the free energy function of solids can be determined by using Equation 5.2.Equilibrium constants K(T) of chemical reaction at temperature T are calculated from the standard Gibbs energy change of the reaction as follows:ln KðTÞ ¼ ÀDG 0 T =ðRTÞ ¼ ÀDH 0 q =ðRTÞÀDðfef Þ TðqÞ =R;ð5:3Þ

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Section: Adiabatic Scanning Calorimetrymentioning

confidence: 99%

Heat Capacity of Solids

Tsuji

2010

Thermodynamic Properties of Solids

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“…Heat capacities of ZrOx and (Zrl-yNby)Ox were measured by an adiabatic scanning calorimeter [14]; in this calorimeter the power supplied to the sample was measured continuously, and the heating rate was kept constant regardless of the kind and amount of the sample. The heating rate chosen was 2 deg.min -1, and the measurement was carried out between 325 and 905 K under a pressure of about 130 Pa of air.…”

Section: Heat Capacity Measurementmentioning

confidence: 99%

Heat capacity measurement of ZrOx and (Zr1−yNby)Ox from 325 TO 905 K

Tsuji

Amaya

Naito

1992

Journal of Thermal Analysis

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Heat capacities of zirconium-oxygen alloys, ZrOx (x = 0.17, 0.20, 0.28 and 0.31), and those of niobium doped alloys, (Zr~-yNby)Ox (x = 0.17 and 0.28, y = 0.005 and 0.01), were measured from 325 to 905 K by an adiabatic scanning calorimeter. Two kinds of heat capacity anomalies were observed for all samples. The anomaly at higher temperatures was assigned to be due to an order-disorder rearrangement of oxygen atoms. Another anomaly at lower temperatures was due to a non-equilibrium phenomenon. The entropy change due to the order-disorder transition for Zr-O solid solution at higher temperature obtained from this experiment was compared with the theoretical value. The transition temperature, transition enthalpy and entropy changes due to the order-disorder transition decreased with increasing niobium contents, indicating that arrangement of oxygen atoms in lower temperature phase may be partially disordered by the interaction between niobium and oxygen atoms.

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Thermodynamik von Legierungsschmelzen: Meßmethoden und Ergebnisse

Komarek

1977

Ber Bunsenges Phys Chem

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Neuere Entwicklungen experimenteller Methoden für die Messung thermodynamischer Größen flüssiger Legierungen mit besonderer Betonung der Kalorimetrie, der EMK‐ und der Knudsen‐Methode werden besprochen. Ausgewählte experimentelle Resultate thermodynamischer Untersuchungen wurden bezüglich des Auftretens von Anomalien analysiert, die auf partielle nichtmetallische Bindungen zurückzuführen sind. Diese Anomalien werden durch die Bildung heteroatomarer „Assoziate”︁ erklärt. Aufgrund veröffentlichter Ergebnisse werden Voraussagen über das Auftreten von Anomalien in binären Schmelzen gemacht.

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Study on a dynamic adiabatic calorimeter. II. Adiabatic scanning calorimeter and some applications

Cited by 24 publications

References 13 publications

Heat Capacity of Solids

Heat Capacity of Solids

Heat capacity measurement of ZrOx and (Zr1−yNby)Ox from 325 TO 905 K

Thermodynamik von Legierungsschmelzen: Meßmethoden und Ergebnisse

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