Reduced Lattice Specific Heat Due to Light Vanadium Impurities in Gold

Tiwari, M. D.; Agrawal, Bal K.

doi:10.1002/pssb.2220580120

Cited by 20 publications

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References 19 publications

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“…There have been large numbers of theoretical and experimental studies on the lattice specific heat of gold and silver alloys [1][2][3][4][5][6][7][8][9][10]. Mizutani and Massalski [11] have measured the lattice specific heat of AgAl and the measurements on AuCd have been performed by Bevk et al [12] at different concentrations of Al and Cd impurities at very low temperatures (1.5-4.2 K).…”

Section: Introductionmentioning

confidence: 99%

Calculation of local density of states and lattice specific heat of gold- and silver-based dilute alloy at very low temperature

Semalty¹

2006

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Calculation of local density of states and lattice specific heat of gold- and silver-based dilute alloy at very low temperature

Semalty¹

2006

Journal of Alloys and Compounds

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Lattice Specific Heat of α‐Phase Alloys Based on Copper and Silver

Tiwari

1980

Physica Status Solidi (b)

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The low temperature lattice specific heat is studied in detail in the a-phase f.c.c. solid solutions of the following systems based on Cu or Ag: Cu-Zn, Cu-Ga, Cu-Ge, Cu-Ni, Ag-Ga, Ag-Ge, and Ag-In. Except in cases of Cu-Zn and Ag-In where a reduction in lattice specific heat is obtained, other systems give a n enhancement due t o introduction of impurities. A defect model which includes the change in mass a t the impurity site and the changes in the impurity-host crystal interactions around the impurity is considered. The effects of lattice expansion or contraction due to the substitution of impurities are also taken into account. For the systems having more than 5 atyo of impurities the low-concentration theory is modified. The calculated results compare well with the experimental data. It is observed in both systems (copper or silver based) that the changed lattice specific heat is quite sensitive t o force constant changes. The contribution due t o Fl,-symmetry modes dominates over all irreducible representations.Die spezifische Tieftemperatur-Gitterwarme wird ausfiihrlich in den cc-Phasen-k.f.2.-Legierungen der folgenden auf Cu oder Ag basierenden Systeme untersncht: Cu-Zn, Cu-Ga, Cu-Ge, Cn-Ni, Ag-Ga, Ag-Ge und Ag-In. AuBer in den Fallen von Cu-Zn und Ag-In, wo eine Reduzierung der spezifischen Gitterwarme erhalten wird, ergeben die a n d x e n Systeme eine Erhohung infolge der Einfuhrung von Storstellen. Ein Defektmodell, das die Anderung der Masse am Storstellenplatz und die h d e r u n g in den Storstellen-Wirtskristall-Wechselwirkungen um die Storstelle einschlieBt, wird untersucht. Die Einfliisse der Gitterausdehnung oder -kontraktion infolge yon Substitution von Storstellen werden ebenfalls berucksichtigt. Fur Systeme, die mehr als 5 Atyo Storstellen besitzen, wird die Niederkonzentrationstheorie modifiziert. Die berechneten Werte stimmen gut mit experimentellen Werten iiberein. In beiden Systemen (auf der Grundlage von Kupfer und Silber) wird beobachtet, daB die h d e r u n g e n der spezifischen Gitterwarme sehr empfindlich gegeniiber Anderungen der Kraftkonstante sind. Der Beitrag der FI,-symmetrischen Moden dominiert iiber alle irreduziblen Darstellungen.

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Specific Heat of Ar‐Xe Solid Solutions at Low Temperatures

Tiwari

1981

Physica Status Solidi (b)

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The measured specific heat of argon with solid solutions of xenon containing 5.01 and 10.88 atyo Xe are analyzed on the basis of low concentration Green's function theory. Maxima are observed a t about 4 K in the relative variation AC( T)/C( ! Z' ) of the solid mixture. The maxima are related to the appearance, in the solid mixture phonon spectrum, of quasilocal oscillations due t o introduction of heavy Xe impurity atoms into the Ar lattice. The changes in mass a t the impurity site as well as changes in the closesbneighbour force constants are taken into account in performing the computations. The force constants for the interaction between the impurity atom and its nearest neighbours are larger than the atomic interaction constants in the initial lattice. For the Ar-10.88 atyo Xe system the low-concentration theory is modified. Reasonably good agreement with the experimental data is obtained. Auf der Grundlage der Theorie Greenscher Funktionen fur niedrige Konzentrationen wird die gemessene spezifische Warme von Argon mit Festeperlosungen von Xenon mit 5,Ol und 10,88 Atyo Xe analysiert. Maxima in der relativen Anderung A C ( T ) / C ( T ) werden in der Festkorpermischung bei etwa 4 K beobachtet. Die Maxima werden dem Auftreten von quasilokalenOszillationen im Phononenspektrum der Festkorpermischung zugeordnet, die durch die Einfuhrung von schweren Xe-Storstellen in das Ar-Gitter hervorgerufen werden. Die Massenanderungen am Storstellenplatz sowie die hderungen der Kraftkonstanten der nachsten Nachbarn werden bei den Berechnungen beriicksichtigt. Die Kraftkonstanten fur die Wechselwirkung zwischen Storstellenatom und seinen niichsten Nachbarn sind groDer als die atomaren Wechselwirkungskonstanten im ursprunglichen Gitter. Fur das Ar-10,88 Atyo Xe-System wird die Theorie niedriger Konzentrationen modifizierl. Vernunftige ubereinstimmung mit den experimentellen Werten wird erhalten.

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Reduced Lattice Specific Heat Due to Light Vanadium Impurities in Gold

Cited by 20 publications

References 19 publications

Calculation of local density of states and lattice specific heat of gold- and silver-based dilute alloy at very low temperature

Calculation of local density of states and lattice specific heat of gold- and silver-based dilute alloy at very low temperature

Lattice Specific Heat of α‐Phase Alloys Based on Copper and Silver

Specific Heat of Ar‐Xe Solid Solutions at Low Temperatures

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