Interstitialcy model for condensed matter states of face-centered-cubic metals

Granato, A. V.

doi:10.1103/physrevlett.68.974

Cited by 301 publications

(251 citation statements)

References 26 publications

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“…Indeed, in typical metals the vacancy concentration is much larger than the interstitial concentration. Until recently, this led researchers to believe that interstitials in most cases play a minor role, but Granato has pointed out that their role is most likely much more important than this, because of the large vibrational entropy associated with an interstitial [11].…”

Section: Point Defects In Crystals and Their Formation And Migration mentioning

confidence: 99%

Elastic Models for the Non-Arrhenius Relaxation Time of Glass-Forming Liquids

Dyre

2006

AIP Conference Proceedings

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Abstract. We first review the phenomenology of viscous liquids and the standard models used for explaining the nonArrhenius average relaxation time. Then the focus is turned to the so-called elastic models, arguing that these models are all equivalent in the Einstein approximation (where the short-time elastic properties are all determined by just one effective, temperature-dependent force constant). We finally discuss the connection between the elastic models and two well-established research fields of condensed-matter physics: point defects in crystals and solid-state diffusion.

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Section: Point Defects In Crystals and Their Formation And Migration mentioning

confidence: 99%

Elastic Models for the Non-Arrhenius Relaxation Time of Glass-Forming Liquids

Dyre

2006

AIP Conference Proceedings

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“…Vacancies are the predominant point defects in metals at elevated temperatures and most diffusion-mediated properties can be explained in terms of vacancy mechanisms [22] but there is clear evidence that the effect of vacancies on the elastic modulus of a solid is weak [23], whereas self-interstitials cause a large reduction [23]. The Granato theory [9] considers that melting is due to the thermo-activated increase in the interstitialcy concentration (self-interstitials assuming the dumbbell configuration) and to their large compliance to the external shear stress that leads to big anelastic deformation in addition to the elasticity and, therefore, induces sharp reduction in modulus G to a small-but nonzero-quantity. The increase in the interstitialcy concentration CI becomes extremely rapid just below TM because of a decrease in the formation enthalpy with concentration and of the strong temperature dependence of formation entropy, as shown by Sinno et al [14].…”

Section: Resultsmentioning

confidence: 99%

“…Granato [9] derived an interstitial-concentration-dependent free energy, appropriate for calculation of all the thermodynamic properties of crystalline and liquid states of metals. The theory predicts that the shear elastic modulus decreases when the concentration of self-interstitials increases.…”

Section: Introductionmentioning

confidence: 99%

Synergic Role of Self-Interstitials and Vacancies in Indium Melting

Montanari

Varone

2015

Metals

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Precursor effects of indium melting have been investigated by means of Mechanical Spectroscopy (MS) and High Temperature X-ray Diffraction (HT-XRD). MS tests evidenced a sharp drop of dynamic modulus in the temperature range between 418 K and 429 K (melting point). At 429 K, HT-XRD showed partial grain re-orientation, peak profile broadening, in particular in the lower part, and peak shift towards lower angles. Experimental results are consistent with density increase of self-interstitials and vacancies in the crystal lattice before melting. Self-interstitials and vacancies play a synergic role in the solid-liquid (S-L) transformation. The increase of self-interstitials over a temperature range of about 10 K before melting has the effect of weakening interatomic bonds (modulus drop) that favors the successive vacancy formation. Finally, the huge increase of vacancy concentration above 428 K leads to the collapse of crystal lattice (melting).

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“…It presents a bump at the temperature called T M , T M = 11.2 K. This is the anomalous behavior that is well known to occur in the specific heat of glasses at low temperature. [25][26][27][28][29][30] It is not expected to happen in materials that obey the Debye law-crystalline solids. It is driven by the presence of additional phonon states in the glassy system.…”

Section: Resultsmentioning

confidence: 99%

Influence of temperature and excitation procedure on the athermal behavior of Nd3+-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements

Astrath

Barboza

Medina

et al. 2009

Journal of Applied Physics

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2009Influence of temperature and excitation procedure on the athermal behavior of Nd(3+)-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements JOURNAL OF APPLIED PHYSICS, v.106, n.7, 2009 http://producao.usp.br/handle/BDPI/16575 In this work, thermal and optical properties of the commercial Q-98 neodymium-doped phosphate glass have been measured at low temperature, from 50 to 300 K. The time-resolved thermal lens spectrometry together with the optical interferometry and the thermal relaxation calorimetry methods were used to investigate the glass athermal characteristics described by the temperature coefficient of the optical path length change, ds / dT. The thermal diffusivity was also determined, and the temperature coefficients of electronic polarizability, linear thermal expansion, and refractive index were calculated and used to explain ds / dT behavior. ds / dT measured via thermal lens method was found to be zero at 225 K. The results provided a complete characterization of the thermo-optical properties of the Q-98 glass, which may be useful for those using this material for diode-pumped solid-state lasers.

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Interstitialcy model for condensed matter states of face-centered-cubic metals

Cited by 301 publications

References 26 publications

Elastic Models for the Non-Arrhenius Relaxation Time of Glass-Forming Liquids

Elastic Models for the Non-Arrhenius Relaxation Time of Glass-Forming Liquids

Synergic Role of Self-Interstitials and Vacancies in Indium Melting

Influence of temperature and excitation procedure on the athermal behavior of Nd3+-doped phosphate glass: Thermal lens, interferometric, and calorimetric measurements

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