Phonon spectra for crystal lattices of V, Cr, Mn, Fe, Co, Ni, and Cu

Sirota, N. N.; Sirota, Ido; Soshnina, T. M.; Sokolovskii, T. D.

doi:10.1134/1.1310727

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…SOD activity was evaluated in the superoxide-generating reaction of epinephrine autooxidation. Adrenochrome formation was recorded at 347 nm [6,7]. SOD activity in the supernatants of tissue homogenates was measured by a modifi ed method.…”

Section: Methodsmentioning

confidence: 99%

Effect of Selenium-Containing Products on Antioxidant Enzyme Activity in the Kidneys, Liver, and Blood of Guinea Pigs

Sirota

2010

Bull Exp Biol Med

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The antioxidant system of some tissues in guinea pigs with no selenium deficiency was studied after treatment with selenium-containing products. Activity of a selenium-containing enzyme glutathione peroxidase was significantly reduced in the kidneys and blood. The kidneys were characterized by low activity of glutathione reductase and high activity of SOD. These features illustrate the development of oxidative stress in the kidneys.

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Section: Methodsmentioning

confidence: 99%

Effect of Selenium-Containing Products on Antioxidant Enzyme Activity in the Kidneys, Liver, and Blood of Guinea Pigs

Sirota

2010

Bull Exp Biol Med

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“…[82]) comprises a somewhat larger interval, 2.7 K < T < 24.5 K, than for ZnS. Furthermore, a comprehensive review of thermo-physical literature revealed an obviously less familiar C p (T) data set given by Sirota et al [84] (for the range 6 K T 300 K). In order to get an idea of the continuation of the C p (T) curve beyond room temperature (for which no data were available from the SGTE data review [47]) we have still included a limited set of C p (T) data points (for the range 400-450 K) given by Pashinkin and Malkova (see Table 1 in Ref.…”

Section: Iii-v Materialsmentioning

confidence: 97%

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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“…At higher temperatures, h T T > , the difference (14) ceases to be negligible, but its relative magnitude, p V p [ ( ) ( )] ( ) 0 C T C T C T -> , uses to be still rather small (<0.5% [8,12,[24][25][26][27]) up to room temperature. At the same time one can state that the deviations of p ( ) C T from the harmonic part of the isochoric heat capacity, larger than the expansion-related difference p (14)).…”

Section: Analytical Model For Isobaric Heat Capacitiesmentioning

confidence: 99%

Dispersion‐related theory for heat capacities of semiconductors

Pässler

2007

Physica Status Solidi (b)

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A reasonable analytical basis for dispersion-related descriptions of the temperature dependences of harmonic parts of isochoric heat capacities is given by a three-oscillator model for phonon density of states (PDOS) spectra of semiconductors with a relatively large degree of phonon dispersion. Within this model, a combination of two lower-energy oscillators substitutes the lower (acoustical) part, and a single higherenergy oscillator represents the upper (optical) part of PDOS spectra. This model provides good simulations of T-dependences of harmonic parts of isochoric heat capacities from moderately low to high temperatures. The incorporation of continuous (quadratic and quartic) power function components into the low-energy tail region enables a very fine description of temperature dependences also throughout the cryogenic region. Deviations of experimentally measured heat capacities from their harmonic parts are quantified by a conveniently designed low-order anharmonicity term. The corresponding analytical model provides excellent numerical simulations of isobaric heat capacities of Si and Ge from absolute zero up to room temperature on the basis of least-mean-square fittings involving total sets of 6 model-specific parameters in combination with known zero temperature values of Debye temperatures. As important byproducts of these fittings we obtain adequate values for the material-specific PDOS spectra moments for all orders within the range 3 10 n -< £ . The extended version of this dispersion-related description, which involves a power series expansion for anharmonic components of heat capacities, represents an unprecedented analytical tool for adequate numerical representations of isobaric heat capacities of Si and Ge throughout the whole experimentally relevant temperature region, i.e. from absolute zero up to the respective melting points. Supporting information for this acticle (Appendices on "Self-sufficient scheme for estimations of even moments" and "Direct use of heat capacity data for determinations of lower moments") is provided online at www.pss-b.com.

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Phonon spectra for crystal lattices of V, Cr, Mn, Fe, Co, Ni, and Cu

Cited by 5 publications

References 3 publications

Effect of Selenium-Containing Products on Antioxidant Enzyme Activity in the Kidneys, Liver, and Blood of Guinea Pigs

Effect of Selenium-Containing Products on Antioxidant Enzyme Activity in the Kidneys, Liver, and Blood of Guinea Pigs

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

Dispersion‐related theory for heat capacities of semiconductors

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