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Artículos de revistas sobre el tema "Phonons; Crystals"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 6 de febrero de 2022

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1

Tyuterev, V. G. "Electron short-wave phonon scattering in crystals with chalcopyrite lattice." Canadian Journal of Physics 98, no. 8 (2020): 818–23. http://dx.doi.org/10.1139/cjp-2019-0523.

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Electron short-wavelength phonon scattering is an effective channel for energy relaxation in crystals with a pseudo-direct optical gap. The equilibrium parameters of crystal structures and spectra of electrons and phonons in the ternary chalcopyrite compounds ZnSiP2 and ZnGeP2 are calculated self-consistently in good agreement with available experimental and theoretical calculations. The ab initio probabilities of phonon-assisted intervalley scattering of electrons in the conduction bands of the pseudo-direct-gap compounds ZnSiP2 and ZnGeP2 between the central Γ minima and the lowest lateral m

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2

Masrura, Haque Mayeesha, Afsal Kareekunnan, Fayong Liu, et al. "Design of Graphene Phononic Crystals for Heat Phonon Engineering." Micromachines 11, no. 7 (2020): 655. http://dx.doi.org/10.3390/mi11070655.

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Controlling the heat transport and thermal conductivity through a material is of prime importance for thermoelectric applications. Phononic crystals, which are a nanostructured array of specially designed pores, can suppress heat transportation owing to the phonon wave interference, resulting in bandgap formation in their band structure. To control heat phonon propagation in thermoelectric devices, phononic crystals with a bandgap in the THz regime are desirable. In this study, we carried out simulation on snowflake shaped phononic crystal and obtained several phononic bandgaps in the THz regi

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3

Stupka, Anton. "Optical vibrations in alkali halide crystals." Canadian Journal of Physics 92, no. 11 (2014): 1356–58. http://dx.doi.org/10.1139/cjp-2014-0094.

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We consider long-wave phonon–polaritons and longitudinal optical phonons in alkali–halide ionic crystals. The model of point charges that are polarized in the self-consistent electromagnetic field in a dielectric environment is used. The standard dispersion laws for both branches of phonon–polaritons and longitudinal optical phonons are obtained. The transversal optical phonon frequency is found from the electrostatic equilibrium condition. It is proved by comparison with tabular data that the found frequency coincides with the ion plasma frequency multiplied on the relation [Formula: see text

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4

Prasher, Ravi. "Thermal Transport Due to Phonons in Random Nano-particulate Media in the Multiple and Dependent (Correlated) Elastic Scattering Regime." Journal of Heat Transfer 128, no. 7 (2006): 627–37. http://dx.doi.org/10.1115/1.2194036.

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Effects of multiple and dependent or correlated elastic scattering of phonons due to nanoparticles on thermal transport in random nano-particulate media (random phononic crystals) are investigated in this paper under various approximations. Multiple scattering means that the scattered wave from one particle is incident on another particle to be scattered again. Dependent scattering means far-field interference of the scattered waves due to phase difference, which is ignored in the independent scattering regime. Multiple and dependent scattering effects become important when the interparticle d

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5

ZHANG, XIAOYAN, JINGFENG WANG, and GUOLIANG FAN. "THE REFLECTIVITY OF THE MIXED CRYSTAL AB1-xCx." International Journal of Modern Physics B 24, no. 27 (2010): 5337–43. http://dx.doi.org/10.1142/s0217979210056761.

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The properties of long wavelength optical phonons in mixed crystals AB 1-x C x is discussed by a model similar to Modified Random Element Isodisplacement (MREI). Using this method we investigate the frequencies, the dielectric functions, and the reflectivity of several mixed crystals. It is found that this model can be applied to the one-mode behavior, the two-mode behavior, and that of the third category. So the model provides a possible way to understand the optical character of the ternary mixed crystal. Based on it, we can discuss other problems similar to electron–phonon interaction and s

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6

Santori, Charles, and Raymond G. Beausoleil. "Phonons in diamond crystals." Nature Photonics 6, no. 1 (2011): 10–12. http://dx.doi.org/10.1038/nphoton.2011.333.

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7

Penciu, R. S., M. Kafesaki, G. Fytas, et al. "Phonons in colloidal crystals." Europhysics Letters (EPL) 58, no. 5 (2002): 699–704. http://dx.doi.org/10.1209/epl/i2002-00322-3.

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8

Franz, M., K. F. Dombrowski, H. Rücker, et al. "Phonons inGe1−xSixbulk crystals." Physical Review B 59, no. 16 (1999): 10614–21. http://dx.doi.org/10.1103/physrevb.59.10614.

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9

Monecke, J. "Phonons in mixed crystals." Journal of Physics: Condensed Matter 3, no. 26 (1991): 4809–16. http://dx.doi.org/10.1088/0953-8984/3/26/004.

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10

Trajic, Jelena, Aleksandar Golubovic, Maja Romcevic, Nebojsa Romcevic, Slobodanka Nikolic, and Vladimir Nikiforov. "Pb1-x Mnx Te and PbTe1-xSx compounds and their optical properties." Journal of the Serbian Chemical Society 72, no. 1 (2007): 55–62. http://dx.doi.org/10.2298/jsc0701055t.

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Pb1-xMnxTe crystals were obtained by the Bridgman method and PbTe1-xSx crystals were grown by the vapour-liquid-solid technique. The structural properties of Pb1-xMnxTe (x?0.10) and PbTe 1-xSx(x?0.05) were observed by X-ray powder diffraction analysis. The optical properties were studied by Raman spectroscopy as a function of temperature. Measurements on these samples of different composition gave information about the Mn and S position in the lattice (off-centering), their clustering and ordering, as well as of the influence of these processes on the crystal structure and properties. The mode

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11

Robbins, Andrew B., Stavros X. Drakopoulos, Ignacio Martin-Fabiani, Sara Ronca, and Austin J. Minnich. "Ballistic thermal phonons traversing nanocrystalline domains in oriented polyethylene." Proceedings of the National Academy of Sciences 116, no. 35 (2019): 17163–68. http://dx.doi.org/10.1073/pnas.1905492116.

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Thermally conductive polymer crystals are of both fundamental and practical interest for their high thermal conductivity that exceeds that of many metals. In particular, polyethylene fibers and oriented films with uniaxial thermal conductivity exceeding 50 W⋅m−1⋅K−1 have been reported recently, stimulating interest into the underlying microscopic thermal transport processes. While ab initio calculations have provided insight into microscopic phonon properties for perfect crystals, such properties of actual samples have remained experimentally inaccessible. Here, we report the direct observatio

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12

EERDUNCHAOLU, WEI XIAO, and JING LIN XIAO. "MAGNETIC FIELD AND TEMPERATURE DEPENDENCE OF THE SURFACE POLARON IN POLAR CRYSTALS." International Journal of Modern Physics B 18, no. 14 (2004): 2003–17. http://dx.doi.org/10.1142/s0217979204025075.

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There is weak bulk but strong surface coupling between electrons and phonons for many polar crystals. We investigate in this paper the effect of a magnetic field and temperature on the electron in polar crystals which is weakly coupled to the bulk longitudinal optical (LO) phonons while strongly coupled to the surface optical (SO) ones. The magnetic field and temperature dependences of the vibration frequency, the self-trapping energy, the induced potential and the effective interaction potential of the surface magnetopolaron were investigated by using a linear combination operator and variati

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13

Zhang, Jiecheng, Eli M. Levenson-Falk, B. J. Ramshaw, et al. "Anomalous thermal diffusivity in underdoped YBa2Cu3O6+x." Proceedings of the National Academy of Sciences 114, no. 21 (2017): 5378–83. http://dx.doi.org/10.1073/pnas.1703416114.

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The thermal diffusivity in the ab plane of underdoped YBCO crystals is measured by means of a local optical technique in the temperature range of 25–300 K. The phase delay between a point heat source and a set of detection points around it allows for high-resolution measurement of the thermal diffusivity and its in-plane anisotropy. Although the magnitude of the diffusivity may suggest that it originates from phonons, its anisotropy is comparable with reported values of the electrical resistivity anisotropy. Furthermore, the anisotropy drops sharply below the charge order transition, again sim

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14

Podoprigora, V. G., I. A. Remizov, V. F. Shabanov, and A. N. Botvich. "Surface Phonons in Molecular Crystals." physica status solidi (b) 139, no. 1 (1987): 109–15. http://dx.doi.org/10.1002/pssb.2221390108.

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15

Mielcarek, S., B. Mroz, A. Trzaskowska, Z. Tylcynski, and T. Andrews. "Surface Phonons in Ferroelastic Crystals." Ferroelectrics 267, no. 1 (2002): 391–96. http://dx.doi.org/10.1080/00150190210995.

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16

Kamenshchikov, V. N., V. A. Stefanovich, Z. P. Gad’mashi, V. I. Sideĭ, and L. M. Suslikov. "Optical phonons in PbGa2S4 crystals." Physics of the Solid State 49, no. 2 (2007): 351–55. http://dx.doi.org/10.1134/s1063783407020278.

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17

PURSKY, O. I., and V. A. KONSTANTINOV. "ISOBARIC THERMAL CONDUCTIVITY IN ORIENTATIONALLY DISORDERED PHASES OF SIMPLE MOLECULAR CRYSTALS." International Journal of Modern Physics B 24, no. 29 (2010): 5821–32. http://dx.doi.org/10.1142/s0217979210054671.

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The isobaric thermal conductivity of solid β- SF 6, CCl 4 (Ib) , and C 6 H 6 is investigated by using the Debye thermal conductivity model and taking into account the effect of minimum thermal conductivity. The simulation was carried out in the framework of a model where heat is transferred by phonons and "diffusive" modes with regard to the thermal expansion and phonon–rotation coupling. For this purpose the temperature dependences of the isobaric heat capacity components have been calculated numerically for β- SF 6, CCl 4 (Ib) , and C 6 H 6. The contributions of phonon–phonon and phonon–rota

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18

Agafonov, A. I. "Phonon residual resistance of pure crystals." International Journal of Modern Physics B 29, no. 29 (2015): 1550206. http://dx.doi.org/10.1142/s0217979215502069.

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In this paper, using the Boltzmann transport equation, we study the zero temperature resistance of perfect metallic crystals of a finite thickness d along which a weak constant electric field E is applied. This resistance, hereinafter referred to as the phonon residual resistance, is caused by the inelastic scattering of electrons heated by the electric field, with emission of long-wave acoustic phonons and is proportional to [Formula: see text]. Consideration is carried out for Cu, Ag and Au perfect crystals with the thickness of about 1 cm, in the fields of the order of 1 mV/cm. Following th

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19

Himmrich, J., G. Schneider, J. Zwinscher, and H. D. Lutz. "Lattice Vibration Spectra. LXX. Evaluation of IR Reflection Spectra. Model Calculations and Experimental Data of MnCr2O4 Single Crystals." Zeitschrift für Naturforschung A 46, no. 12 (1991): 1095–102. http://dx.doi.org/10.1515/zna-1991-1214.

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Abstract The various evaluation procedures of IR reflection spectra, viz. Kramer-Kronig analyses (KKA), 3 parameter (coTO, g, y) (3 PM), and 4 parameter (ωro, ωLO yro yLO) oscillator-model calculations (4 PM), are compared. For the zone-centre phonon energies, the oscillator parameters ωro and ωLO of 4 PM as well as the frequencies of the dielectric functions ε" and - Im(l/ε), respectively (KKA, 3 PM), are recommended. The pole frequencies of the |ε| functions yield too large TO/LO splittings, especially in the case of large damping of the phonons. In the case of asymmetric reststrahlen bands,

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20

FUJITA, SHIGEJI, JAMES PIENTKA, and AKIRA SUZUKI. "ON VAN HOVE SINGULARITIES IN PURE CUBIC CRYSTALS." Modern Physics Letters B 26, no. 15 (2012): 1250091. http://dx.doi.org/10.1142/s0217984912500911.

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Sharp peaks (van Hove singularities) occur when the density of states is plotted as a function of the phonon frequency. The singularities, jumps in the derivative of the density of states, occur in three and two dimensions when the constant-frequency plane touches the Brillouin zone boundary and undergoes a curvature inversion. The face-centered cubic lattice is composed of two simple cubic sablattices and one tetragonal sub-lattice. The first (second) major peaks in the observed density of states in aluminum ( Al ) are shown to arise from the transverse phonons associated with the cubic (tetr

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21

WEI, SHU YI, FANG ZHANG, WEI LI, ZU ZHAO, and WEN DENG HUANG. "ELECTRON–PHONON INTERACTION IN WURTZITE AlxGa1-xN TERNARY CRYSTAL." International Journal of Modern Physics B 21, no. 22 (2007): 3841–50. http://dx.doi.org/10.1142/s0217979207037740.

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Optical vibrations of the lattice and the electron-optical-phonon interaction in wurtzite ternary nitride-based crystals was studied using the pseudo-unit-cell approach. The Fröhlich coupling constants, polaron energy shifts and the effective masses of the polaron in the system were investigated using the perturbation method. It was found that the LO and TO phonons in wurtzite Al x Ga 1-x N exhibit the one-mode behavior. The effects of the unit-cell volume varying with the composition x of ternary nitride-based crystals were also investigated.

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22

Chu, Qian-Jin, and Zhao-Qing Zhang. "Localization of phonons in mixed crystals." Physical Review B 38, no. 7 (1988): 4906–15. http://dx.doi.org/10.1103/physrevb.38.4906.

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23

Brillante, A., R. G. Della Valle, A. Girlando, A. Paineffi, and E. Venuti. "Intermolecular phonons in BEDT-TTF crystals." Synthetic Metals 85, no. 1-3 (1997): 1561–62. http://dx.doi.org/10.1016/s0379-6779(97)80348-7.

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24

Michel, K. H., and B. Verberck. "Rigid-plane phonons in layered crystals." physica status solidi (b) 249, no. 12 (2012): 2604–7. http://dx.doi.org/10.1002/pssb.201200119.

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25

Plekhanov, V. G. "Phonons in mixed LiH1−xDx crystals." Physics Letters A 148, no. 5 (1990): 281–84. http://dx.doi.org/10.1016/0375-9601(90)90992-w.

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26

Lakhno, Victor D. "Translation-Invariant Excitons in a Phonon Field." Condensed Matter 6, no. 2 (2021): 20. http://dx.doi.org/10.3390/condmat6020020.

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Large-radius excitons in polar crystals are considered. It is shown that translation invariant description of excitons interacting with a phonon field leads to a nonzero contribution of phonons into the exciton ground state energy only in the case of weak or intermediate electron-phonon coupling. A conclusion is made that self-trapped excitons cannot exist in the limit of strong coupling. Peculiarities of the absorption and emission spectra of translation invariant excitons in a phonon field are discussed. Conditions when the hydrogen-like exciton model remains valid in the case of electron-ph

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27

Kushwaha, Manvir S. "The phononic crystals: An unending quest for tailoring acoustics." Modern Physics Letters B 30, no. 19 (2016): 1630004. http://dx.doi.org/10.1142/s0217984916300040.

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Periodicity (in time or space) is a part and parcel of every living being: one can see, hear and feel it. Everyday examples are locomotion, respiration and heart beat. The reinforced N-dimensional periodicity over two or more crystalline solids results in the so-called phononic band gap crystals. These can have dramatic consequences on the propagation of phonons, vibrations and sound. The fundamental physics of cleverly fabricated phononic crystals can offer a systematic route to realize the Anderson localization of sound and vibrations. As to the applications, the phononic crystals are envisa

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28

Gasanov, Kh A., J. I. Guseinov, I. I. Abbasov, D. J. Askerov, and Kh O. Sadig. "Electron-Phonon Scattering in Quantum-Sized Films with the Hyperbolic Pöschl–Teller Potential." Ukrainian Journal of Physics 64, no. 4 (2019): 336. http://dx.doi.org/10.15407/ujpe64.4.336.

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A quantitative theory of electron-phonon interaction in the two-dimensional electron gas in a quantum-sized film with the hyperbolic P¨oschl–Teller confining potential has been developed. Analytical expressions for the transition probability are derived in the case of electron scattering by deformation-induced acoustic, piezoacoustic, and polar optical phonons. The results obtained for various scattering mechanisms in the film are compared with the results obtained for bulk crystals.

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29

Laude, Vincent. "Phononic crystals: Harnessing the propagation of sound, elastic waves, and phonons." Comptes Rendus Physique 17, no. 5 (2016): 497–99. http://dx.doi.org/10.1016/j.crhy.2016.02.010.

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30

Troitskaya, E. P., Val V. Chabanenko, and E. E. Horbenko. "Phonons and electron-phonon interactions in rare-gas crystals at high pressures." Physics of the Solid State 49, no. 11 (2007): 2154–62. http://dx.doi.org/10.1134/s1063783407110236.

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31

Рогинский, Е. М., А. С. Крылов та Ю. Ф. Марков. "Эффекты фазового перехода, индуцированные давлением, в модельных сегнетоэластиках Hg-=SUB=-2-=/SUB=-Br-=SUB=-2-=/SUB=-". Письма в журнал технической физики 44, № 17 (2018): 3. http://dx.doi.org/10.21883/pjtf.2018.17.46564.17346.

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AbstractRaman spectra of model improper ferroelastics (Hg_2Br_2 crystals) have been analyzed in a wide range of hydrostatic pressures. The baric dependences of the phonon frequencies are obtained. The revealing and anomalous behavior of the soft mode, which is genetically related to the acoustic phonon (ТА_1) at the Brillouin zone boundary (point X ) of the tetragonal phase, are most interesting. The buildup of the second acoustic phonon (ТА_2) from the same point has also been found in the ferroelastic-phase spectra, and its baric behavior has been investigated. The splitting of doubly degene

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32

Seki, Tomohiro, Norihisa Hoshino, Yasutaka Suzuki, and Shotaro Hayashi. "Functional flexible molecular crystals: intrinsic and mechanoresponsive properties." CrystEngComm 23, no. 34 (2021): 5686–96. http://dx.doi.org/10.1039/d1ce00388g.

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Flexible molecular crystals have attracted much attention to unique optoelectronic applications and stimuli-responsive chemistry, resulting in various functional molecular crystals for controlling photons, phonons, electrons, and magnons.

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33

Parlinski, K., M. Parlinskal, and R. Gotthardt. "Phonons in austenite and martensite NiTi crystals." Journal de Physique IV (Proceedings) 112 (October 2003): 635–38. http://dx.doi.org/10.1051/jp4:2003963.

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34

Zhang, An-Min, Kai Liu, Jian-Ting Ji, et al. "Raman phonons in multiferroic FeVO 4 crystals." Chinese Physics B 24, no. 12 (2015): 126301. http://dx.doi.org/10.1088/1674-1056/24/12/126301.

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35

Vinogradov, Evgenii A., B. N. Mavrin, N. N. Novikova, and V. A. Yakovlev. "Inverted optical phonons in ion-covalent crystals." Uspekhi Fizicheskih Nauk 179, no. 3 (2009): 313. http://dx.doi.org/10.3367/ufnr.0179.200903l.0313.

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36

Lakhno, V. D., and G. N. Chuev. "Local phonons in crystals with electron centres." physica status solidi (b) 152, no. 1 (1989): 79–87. http://dx.doi.org/10.1002/pssb.2221520109.

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37

Stefanovich, V. A., L. M. Suslikov, Z. P. Gad’mashi, et al. "Optical phonons in Rb2TeBr6 and Cs2TeBr6 crystals." Physics of the Solid State 46, no. 6 (2004): 1024–26. http://dx.doi.org/10.1134/1.1767237.

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38

Benoit, C., G. Poussigue, and A. Azougarh. "Neutron scattering by phonons in quasi-crystals." Journal of Physics: Condensed Matter 2, no. 11 (1990): 2519–36. http://dx.doi.org/10.1088/0953-8984/2/11/002.

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39

Hu, X. B., J. Y. Wang, C. Q. Zhang, X. G. Xu, Chun-Keung Loong, and Marcos Grimsditch. "Raman study of phonons in K2Al2B2O7 crystals." Applied Physics Letters 85, no. 12 (2004): 2241–43. http://dx.doi.org/10.1063/1.1786661.

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40

Fleischhauer, H. ‐C, Carola Kryschi, Birgit Wagner, and Hans Kupka. "Pseudolocal phonons inp‐terphenyl: pentacene single crystals." Journal of Chemical Physics 97, no. 3 (1992): 1742–49. http://dx.doi.org/10.1063/1.463161.

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41

Benedek, G., F. Hofmann, P. Ruggerone, G. Onida, and L. Miglio. "Surface phonons in layered crystals: theoretical aspects." Surface Science Reports 20, no. 1 (1994): 1–43. http://dx.doi.org/10.1016/0167-5729(94)90002-7.

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42

Süsstrunk, Roman, and Sebastian D. Huber. "Classification of topological phonons in linear mechanical metamaterials." Proceedings of the National Academy of Sciences 113, no. 33 (2016): E4767—E4775. http://dx.doi.org/10.1073/pnas.1605462113.

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Topological phononic crystals, alike their electronic counterparts, are characterized by a bulk–edge correspondence where the interior of a material dictates the existence of stable surface or boundary modes. In the mechanical setup, such surface modes can be used for various applications such as wave guiding, vibration isolation, or the design of static properties such as stable floppy modes where parts of a system move freely. Here, we provide a classification scheme of topological phonons based on local symmetries. We import and adapt the classification of noninteracting electron systems an

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43

Petrusevski, Vladimir, Vladimir Ivanovski, and Metodija Najdoski. "FT-IR reflection spectra of single crystals: Resolving phonons of different symmetry without using polarised radiation." Journal of the Serbian Chemical Society 65, no. 7 (2000): 529–36. http://dx.doi.org/10.2298/jsc0007529p.

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Fourier-transform infrared (FT-IR) reflection spectra, asquired at nearnormal incidence, were recorded from single crystals belonging to six crystal systems: CsCr(SO4)2?12H2O(alum, cubic),K2CuCl4?2H2O(Mitscherlichite, tetragonal), CaCO3 (calcite, hexagonal),KHSO4 (mercallite, orthorhombic), CaSO4?2H2O(gypsum, monoclinic) and CuSO4?5H2O (chalcantite, triclinic). The acquired IR reflection spectra were further transformed into absorption spectra, employing the Kramers-Kronig transformation. Except for the cubic alums, the spectra strongly depend on the crystal face from which they were recorded;

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44

MEHANEY, AHMED, MOSTAFA F. EISSA, and ARAFA H. ALY. "DETECTION AND DISCRIMINATION BETWEEN ALPHA PARTICLES AND PROTONS BASED ON PHONONIC CRYSTALS MATERIALS." Surface Review and Letters 26, no. 07 (2019): 1850219. http://dx.doi.org/10.1142/s0218625x18502190.

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Ionizing particles detection based on phonons counting are considered as a growing research point of great interest. Phononic crystal (PnC) detectors have a higher resolution than other detectors. In the present work, we shall prepare a setup of a radiation detector based on a 1D PnC. The PnC detector can be used in detection and discrimination between protons and alpha particles with incident energy 1[Formula: see text]MeV. We have proposed a model capable of filtering the energies of two different ionizing particles (proton and alpha particle) of specific lattice frequencies in steps. Firstl

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45

Chen, Yi, Muamer Kadic, and Martin Wegener. "Chiral triclinic metamaterial crystals supporting isotropic acoustical activity and isotropic chiral phonons." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 477, no. 2246 (2021): 20200764. http://dx.doi.org/10.1098/rspa.2020.0764.

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Recent work predicted the existence of isotropic chiral phonon dispersion relations of the lowest bands connected to isotropic acoustical activity in cubic crystalline approximants of three-dimensional (3D) chiral icosahedral metamaterial quasi-crystals. While these architectures are fairly broadband and presumably robust against fabrication tolerances due to orientation averaging, they are extremely complex, very hard to manufacture experimentally, and they show effects which are about an order of magnitude smaller compared with those of ordinary highly anisotropic chiral cubic metamaterial c

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46

MISOCHKO, O. V., and A. KH. ARSLANBEKOV. "RESONANT PROPERTIES OF INELASTIC LIGHT SCATTERING IN Bi2Sr2CaCu2O8-x SUPERCONDUCTING SINGLE CRYSTALS." Modern Physics Letters B 06, no. 18 (1992): 1137–43. http://dx.doi.org/10.1142/s0217984992002003.

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The resonant properties of Raman scattering in Bi 2 Sr 2 CaCu 2 O 8-x single crystals for four diagonal phonons and electronic scattering as well have been investigated for different polarizations. The resonance profiles for the phonons were of similar character, but the resonant profiles of the two components of electronic scattering, by contrast, were different.

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47

Tsang, Alan Cheng Hou, Michael J. Shelley, and Eva Kanso. "Activity-induced instability of phonons in 1D microfluidic crystals." Soft Matter 14, no. 6 (2018): 945–50. http://dx.doi.org/10.1039/c7sm01335c.

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48

Zheng, Ruisheng, and Mitsuru Matsuura. "Optical phonons and electron–phonon interaction in quantum wells consisting of mixed crystals." Journal of Luminescence 87-89 (May 2000): 626–28. http://dx.doi.org/10.1016/s0022-2313(99)00333-6.

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49

Stupka, A. A. "Frequencies of Long-Wave Phonon-Polaritons and Optical Phonons in Diatomic Ionic Crystals." Ukrainian Journal of Physics 59, no. 8 (2014): 793–96. http://dx.doi.org/10.15407/ujpe59.08.0793.

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50

Dalal, Paresh Vasantlal. "Thermal Conductivity of Gel-Grown Barium Oxalate at 326 and 335 K." Journal of Soft Matter 2013 (July 24, 2013): 1–4. http://dx.doi.org/10.1155/2013/162428.

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Single crystals of barium oxalate have been grown by gel method using agar-agar gel as media of growth at ambient temperature. The grown crystal crystallizes under monoclinic structure. Thermal conductivity of gel-grown barium oxalate crystals as a function of temperature has been studied at 326 and 335 K by using divided bar method. The thermal conductivity of barium oxalate crystal at 326 K was found 3.685 W m−1 K−1 and 3.133 W m−1 K−1 at 335 K. The reduction of thermal conductivity with the rise in temperature may be due to reduction in mean free path of phonons in the solid.

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