Heat capacity, enthalpy and entropy of calcium niobates

Leitner, J.; Růžička, Květoslav; Sedmidubský, David; Svoboda, P.

doi:10.1007/s10973-008-9245-2

Cited by 28 publications

(10 citation statements)

References 18 publications

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“…Enthalpies of drop-solution in 3Na2O + 4MoO3 melt (ΔdsH) and enthalpy of formation from constituent binary oxides (ΔoxH) [30] Our values for the calcium niobates are in good agreement with Raghavan's data [7,8], while the data from Dneprova et al [11] [12] are substantially more exothermic than our calorimetric data. These large differences in the ΔoxH values are not surprising in view of simultaneous differences in the ΔoxS values from the assessment [12] and those derived from low temperature dependences of the molar heat capacity of SrNb2O6 and Sr2Nb2O7 [24,26].…”

Section: Evaluation Of Enthalpy Of Formationmentioning

confidence: 99%

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Leitner¹,

Sedmidubský²,

Svoboda³

2013

Applications of Calorimetry in a Wide Context - Differential Scanning Calorimetry, Isothermal Titration Calorimetry and Microca

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Section: Evaluation Of Enthalpy Of Formationmentioning

confidence: 99%

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Leitner¹,

Sedmidubský²,

Svoboda³

2013

Applications of Calorimetry in a Wide Context - Differential Scanning Calorimetry, Isothermal Titration Calorimetry and Microca

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“…Heat capacities determinations of various compounds have attracted many researchers' attention [10][11][12]. Molar heat capacities of the materials at different temperatures are basic data in chemistry and engineering, from which many other thermodynamic properties such as enthalpy and entropy can be calculated.…”

Section: Introductionmentioning

confidence: 99%

Heat capacities and thermodynamic properties of MgNDC

Song

Jiao

Jiang

et al. 2010

J Therm Anal Calorim

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One-three-dimensional metal-organic frameworks Mg 1.5 (C 12 H 6 O 4 ) 1.5 (C 3 H 7 NO) 2 (MgNDC) has been synthesized solvothermally and characterized by single crystal XRD, powder XRD, FT-IR spectra. The low-temperature molar heat capacities of MgNDC were measured by temperature modulated differential scanning calorimetry (TMDSC) over the temperature range from 205 to 470 K for the first time. No phase transition or thermal anomaly was observed in the experimental temperature range. The thermodynamic parameters of MgNDC such as entropy and enthalpy relative to reference temperature of 298.15 K were derived based on the above molar heat capacities data. Moreover, the thermal stability and decomposition of MgNDC was further investigated through thermogravimetry (TG)-mass spectrometer (MS). Three stages of mass loss were observed in the TG curve. TG-MS curve indicated that the oxidative degradation products of MgNDC are mainly H 2 O, CO 2 , NO, and NO 2 .

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“…This concerns not only the group of nitrides [24,[28][29][30], but also a variety of ternary materials [40][41][42]. Such improper C p (T) data simulations provided the main motivation for the completion of the present study.…”

mentioning

confidence: 99%

Representative hybrid model used for analyses of heat capacities of group‐IV, III–V, and II–VI materials

Pässler

2010

Physica Status Solidi (b)

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Characteristic non-Debye features inherent to the dispersionrelated hybrid model, which had been devised for the sake of physically adequate representations of isobaric heat capacities of semiconductor and wide band gap materials, are demonstrated and discussed in some detail. We perform least-meansquare fittings of low-and high-temperature C p (T) data sets that are available for group-IV materials (diamond, Si, Ge, 3C-SiC), III-V materials (BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InP, InAs, InSb), and II-VI materials (ZnO, ZnS, ZnSe, ZnTe, CdO, CdS, CdSe, CdTe). The simulations of the C p (T) data sets under study, particularly with respect to the cryogenic region, are graphically represented, and existing data deficiencies are discussed. Important by-products of the fittings are presented within the frame of Supporting Information (online at: www.pss-b.com). There are given in tabulated form the characteristic phonon energies, e P (m), for integral orders, m ¼ À2, À1, 0, 1, 2, and 4, including further dispersion-related parameters like average phonon temperatures, Q P , dispersion coefficients, D P , and high-temperature limiting values of Debye temperatures, Q Dh (1). Furthermore, basing on comprehensive calculations of the C p (T) dependences from absolute zero up to room temperature, we provide representative values of entropies, S p (T), enthalpies, H p (T) À H p (0), and Gibbs free energies, G p (T) À G p (0), for the frequently considered reference point, T r ¼ 298.15 K, the accurate knowledge of which is indispensable for possible high-temperature continuations of these standard thermodynamic functions within the frame of the commonly used thermo-chemical formalism.

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Heat capacity, enthalpy and entropy of calcium niobates

Cited by 28 publications

References 18 publications

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Heat capacities and thermodynamic properties of MgNDC

Representative hybrid model used for analyses of heat capacities of group‐IV, III–V, and II–VI materials

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