Peculiarities of thermal expansion of layered crystals

Belenkii, G. L.; Abdullayeva, S.G.; Solodukhin, A.V.; Suleymanov, Rauf A.

doi:10.1016/0038-1098(82)90691-3

Cited by 31 publications

(15 citation statements)

References 9 publications

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“…High anisotropy in thermal expansion and negative thermal expansion are common in layered compounds [23]. It results from anisotropic bonding between atoms, with strong bonds within the layers and weaker bonding between layers.…”

Section: Resultsmentioning

confidence: 99%

Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions

Masunaga

Rebello

Schye

et al. 2015

Journal of Physics and Chemistry of Solids

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Sleep Slow Oscillations (SSOs), paradigmatic EEG markers of cortical bistability (alternation between cellular downstates and upstates), and sleep spindles, paradigmatic EEG markers of thalamic rhythm, are two hallmarks of sleeping brain. Selective thalamic lesions are reportedly associated to reductions of spindle activity and its spectrum~14 Hz (sigma), and to alterations of SSO features. This apparent, parallel behavior suggests that thalamo-cortical entrainment favors cortical bistability. Here we investigate temporally-causal associations between thalamic sigma activity and shape, topology, and dynamics of SSOs. We recorded sleep EEG and studied whether spatio-temporal variability of SSO amplitude, negative slope (synchronization in downstate falling) and detection rate are driven by cortical-sigma-activity expression (12-18 Hz), in 3 consecutive 1 s-EEG-epochs preceding each SSO event (Baselines). We analyzed: (i) spatial variability, comparing maps of baseline sigma power and of SSO features, averaged over the first sleep cycle; (ii) event-by-event shape variability, computing for each electrode correlations between baseline sigma power and amplitude/slope of related SSOs; (iii) eventby-event spreading variability, comparing baseline sigma power in electrodes showing an SSO event with the homologous ones, spared by the event. The scalp distribution of baseline sigma power mirrored those of SSO amplitude and slope; event-by-event variability in baseline sigma power was associated with that in SSO amplitude in fronto-central areas; within each SSO event, electrodes involved in cortical bistability presented higher baseline sigma activity than those free of SSO. In conclusion, spatio-temporal variability of thalamocortical entrainment, measured by background sigma activity, is a reliable estimate of the cortical proneness to bistability.

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Section: Resultsmentioning

confidence: 99%

Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions

Masunaga

Rebello

Schye

et al. 2015

Journal of Physics and Chemistry of Solids

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“…Using the experimental values of g [10] and a(T ) [20], the frequency shifts for intralayer modes were ®tted by means of Eqs. (1)±(3) with A, n 0 , n 1 , and n 2 as adjustable parameters, with keeping the sum of n 1 n 2 n 0 constant (energy conservation).…”

Section: Resultsmentioning

confidence: 99%

Temperature-dependent Raman scattering spectra of ε-GaSe layered crystal

Gasanly

Aydınlı

Özkan

et al. 2002

Materials Research Bulletin

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The temperature dependencies (15±300 K) of seven Raman-active mode frequencies and linewidths in layered gallium selenide have been measured in the frequency range from 10 to 320 cm À1 . We observed softening and broadening of the optical phonon lines with increasing temperature. Comparison between the experimental data and theories of the shift and broadening of the intralayer phonon lines during heating of the crystal showed that the experimental dependencies can be explained by the contributions from thermal expansion, lattice anharmonicity and crystal disorder. The pure-temperature contribution (phonon± phonon coupling) is due to three-phonon processes. Moreover, it was established that the effect of crystal disorder on the linewidth broadening of TO mode is stronger than that of LO mode. #

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“…Using the experimental values of g [7] and a(T ) [13], the frequency shift for the interlayer mode was ®tted (solid curve in Fig. 3) by means of Eqs.…”

Section: Resultsmentioning

confidence: 99%

Temperature dependence of the first-order Raman scattering in GaS layered crystals

Gasanly

Aydınlı

Özkan

et al. 2000

Solid State Communications

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The temperature dependence (15±293 K) of the six Raman-active mode frequencies and linewitdhs in gallium sul®de has been measured in the frequency range from 15 to 380 cm 21. We observed softening and broadening of the optical phonon lines with increasing temperature. Comparison between the experimental data and theories of the shift and broadening of the interlayer and intralayer phonon lines during the heating of the crystal showed that the experimental dependencies can be explained by the contributions from thermal expansion and lattice anharmonicity. The pure-temperature contribution (phonon± phonon coupling) is due to three-and four-phonon processes. q

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Peculiarities of thermal expansion of layered crystals

Cited by 31 publications

References 9 publications

Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions

Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions

Temperature-dependent Raman scattering spectra of ε-GaSe layered crystal

Temperature dependence of the first-order Raman scattering in GaS layered crystals

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