Low-temperature heat capacity and thermodynamic properties of four boron nitride modifications

Гавричев, К. С.; Solozhenko, Vladimir L.; Gorbunov, V. E.; Golushina, L. N.; Totrova, G. A.; Лазарев, В. Б.

doi:10.1016/0040-6031(93)85099-u

Cited by 26 publications

(17 citation statements)

References 7 publications

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“…3). We have included into the fitting process the compatible set of smoothed C p (T) data points given by Gavrichev et al [54] (for the region 140-500 K) and a set of equidistant (smoothed) C p (T) data points from the SGTE data review [47] (for the region from 550 to 1100 K). From Fig.…”

Section: Iii-v Materialsmentioning

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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Section: Iii-v Materialsmentioning

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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“…13 At irradiation of laser fluence values F L ഛ 20 mJ/ cm 2 , the local surface temperature is below the hBN melting point, T melt Ϸ 3000 K. 14 At higher fluence, the local heat results in a material melting and an evaporation, and the ablation appears at F L * =78 mJ/cm 2 . A small value of the dissociation cross section 2 / at Ϸ 2.4· 10 −4 suggests a low efficiency of the dissociation process (1).…”

Section: Femtosecond Laser Irradiationmentioning

confidence: 99%

Femtosecond and ultraviolet laser irradiation of graphitelike hexagonal boron nitride

Kanaev

Petitet

Museur

et al. 2004

Journal of Applied Physics

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Direct observation of anti-phase boundaries in heteroepitaxy of GaSb thin films grown on Si(001) by transmission electron microscopy J. Appl. Phys. 112, 074306 (2012) Carrier recombination lifetime in InAs thin films bonded on low-k flexible substrates AIP Advances 2, 042105 (2012) Tunability of intersubband transition wavelength in the atmospheric window in AlGaN/GaN multi-quantum wells grown on different AlGaN templates by metalorganic chemical vapor deposition J. Appl. Phys. 112, 063526 (2012) Anomalous temperature dependence of photoluminescence in self-assembled InGaN quantum dots Appl. Phys. Lett. 101, 131101 (2012) Optical properties of InGaPN epilayer with low nitrogen content grown by molecular beam epitaxyThe effect of the femtosecond and nanosecond UV laser irradiation (below the ablation threshold) on graphitelike hexagonal boron nitride (hBN) has been studied. Experiments were carried out with the compacted powder under high vacuum at room temperature using the excimer KrF laser ͑248 nm͒. In the nanosecond operation mode, the laser-induced fluorescence spectra are found strongly modified depending on the integrated doze, which is attributed to a progressive enrichment of the surface layer by an elemental boron. A slow sample recovery after the laser irradiation has been observed. On the other hand, in the femtosecond mode, the fluorescence spectra depend on the laser fluence, and the changes are reversible: low-energy fluorescence spectra are restored immediately when the laser energy decreases. This effect can be explained by a material bleaching, which favors a bulk centers emission. The ablation threshold has been determined as 78 mJ/ cm 2 in the femtosecond laser operational mode.

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“…The purity of the substance is the most important characteristic in the study of heat capacity. Synthetic diamond and various modifications of boron nitrides (cubic, wurtzite, hexagonal, rhombohedral, turbostratic) [34] contain various impurities due to the specifics of their synthesis [36].…”

Section: Diamond and C-bn; Graphite And H-bnmentioning

confidence: 99%

The Description of Heat Capacity by the Debye – Mayer – Kelly Hybrid Model<strong> </strong>

Vasiliev¹,

Taldrik²

2020

Preprint

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The universal Debye – Mayer – Kelly hybrid model was proposed for the description of the heat capacity from 0 K to the melting points of substance within the experimental uncertainty for the first time. To describe the heat capacity, the in-house software on the base of commercial one DELPHI-7 was used with a 95% confidence level. To demonstrate the perfect suitability of this model, a thermodynamic analysis of the heat capacities of the fourth group elements, and some compounds of the AIIIBV and AIIBVI phases was carried out. It produced good agreement within the experimental uncertainty. There is no a similar model description in literature.The Similarity Method is a convenient and effective tool for critical analysis of the heat capacities of isostructural phases, which was used as an example for diamond-like compounds. Phases with the same sum of the atomic numbers of elements (Z), such as diamond and B0.5 N0.5 (cub) (Z = 6); pure silicon (Si) and Al0.5 P0.5 (Z=14); pure germanium (Ge) and Ga0.5 As0.5 (Z = 32)); pure grey tin (alpha-Sn) and In0.5 Sb0.5, and Cd0.5 Te0.5 (Z = 50) have the same heat capacity experimental values in the solid state. The proposed models can be used to both different binary and multicomponent phases. It helps to standardize the physicochemical constants.

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Low-temperature heat capacity and thermodynamic properties of four boron nitride modifications

Cited by 26 publications

References 7 publications

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

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

Femtosecond and ultraviolet laser irradiation of graphitelike hexagonal boron nitride

The Description of Heat Capacity by the Debye – Mayer – Kelly Hybrid Model<strong> </strong>

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