CLXI.—Existence of racemic compounds in the liquid state. Part II

Smith, Clarence

doi:10.1039/ct9140501703

Cited by 11 publications

(3 citation statements)

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“…For mathematical convenience usually the coupling constants a and are used, which are components of the force on an atom caused by a shift of the neighbour along the cubic axis [19, 201. When a and are fitted to the elastic constants cll and c12 [21] the calculated ca4 is in general agreement with the experimental value However, when calculating phonon dispersion relations only a poor approximation is obtained [ 2 2 ] . Especially the frequencies (oy$ and to??…”

Section: The Nearest-neighbour Modelmentioning

confidence: 63%

Thermal Expansion of Silicon and Zinc Oxide (I)

Ibach¹

1969

Physica Status Solidi (b)

169

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A new expansion cell for the three-terminal capacitance method is developed. Length changes in the order of cm can be measured a t samples of only 4 mm. At first the expansion coefficient of silicon (reference material) is investigated in detail from 20 to 300 O K . The work is completed by interferometric measurements up to 800 "K. The temperature dependence of the expansion coefficient is discussed using the thermal equation of state. Furthermore conclusions are drawn concerning the contributions of different phonon branches and compared to calculations on the basis of well-known models.Zur Messung der thermischen Ausdehnung an kleinen Einkristallen wurde eine neue MeBzelle fur die kapazitive Dreipunktmethode entwickelt. Damit konnen Llngenanderungen von 10-9 cm a n nur 4 mm langen Proben gemessen werden. Zunachst wurde der Ausdehnungskoeffizient von dem als Referenzmaterial verwendeten Silizium zwischen 20 und 300 O K eingehend untersucht. Die Ergebnisse wurden vervollstandigt durch interferometrische Messungen bis zu 800 OK. Der Temperaturverlauf des Ausdehnungskoeffizienten wird an Hand der thermischen Zustandsgleichung ausgewertet. Ferner wurden die Beitrage verschiedener Phononen-Zweige untersucht und die Resultate mit Rechnungen auf der Grundlage bekannter Modelle verglichen.

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Section: The Nearest-neighbour Modelmentioning

confidence: 63%

Thermal Expansion of Silicon and Zinc Oxide (I)

Ibach¹

1969

Physica Status Solidi (b)

169

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“…This is to be witnessed in a gradual development of a number of models and their applications to a detailed evaluation of the pfd. Some of the recent ones are by BHATIA [l], DE LAUNAY [2], SLUTSKY and GAR-LAND [3], independently by BORN and BEGEIE [4], SMITH [5] and KELLERMANN [6] respectively. They have been successfully applied to the body-centred and facecentred cubic metals by BHATIA, SHARAN [7], and STNGH [S], to hexagonal metals by SLUTSKY and GARLAND, to diamond and germanium by SMITH and HSIEH [9], and to sodium chloride type of structures by KELLERMANN, KARO [ For the evaluation of the physical properties, a detailed information about the nature of the atomic interaction is called for.…”

Section: Introductionmentioning

confidence: 99%

Coupling Coefficients and Elastic Constants of Caesium Halides

Sharan¹,

Tiwari²

1964

Physica Status Solidi (b)

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Following Kellermann, the Brillouin zone of caesium chloride is divided into 10 × 10 × 10 equal regions. The coupling coefficients are calculated for 56 non‐equivalent points including the origin of the Brillouin zone, a correct enumeration of which points yields a total of 1,000 wave vectors or 12,000 coupling coefficients. Reststrahlen frequency is used in preference to compressibility in the evaluation of the constants of the repulsive part. A relation between the elastic constants and the second order coupling coefficients different from that of KELLERMANN is used, and within the limitations of the model, the agreement between theory and experiment for the elastic constants is reasonable, and is very good for the compressiblility.

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“…The experimental values for the surface tension of pure components at working temperatures and atmospheric pressure are collected in Table . The surface tension values for the pure compounds found in the literature − are also included in this table. In general, the accordance between the experimental and literature data is good, particularly for the case of alcohols.…”

Section: Resultsmentioning

confidence: 99%

Surface and Calorimetric Behavior of N,N-Dimethylacetamide with n-Alkanols or 2-Alkanols

et al. 2022

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The surface tension at the liquid−air interface of eight binary mixtures formed by N,N-dimethylacetamide and n-alkanols (from methanol to 1-pentanol) or 2-alkanols (from 2-propanol to 2-pentanol) was studied at three different temperatures (283.15, 298.15, and 313.15 K) and a pressure of 0.1 MPa. Surface tension deviations were also calculated. Moreover, the excess molar enthalpies for all of these mixtures were measured at T = 298.15 K and a pressure of 0.1 MPa. Both deviation and excess functions were correlated with the mole fraction by means of the Redlich−Kister equation. The surface tension deviations are found to be positive for the system containing methanol, sigmoidal for ethanol and negative for the rest of the alkanols. With regard to excess molar enthalpies, negative values are found for the system containing methanol, sigmoidal values for ethanol, and positive values for the rest of the alkanols.

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CLXI.—Existence of racemic compounds in the liquid state. Part II

Cited by 11 publications

References 0 publications

Thermal Expansion of Silicon and Zinc Oxide (I)

Thermal Expansion of Silicon and Zinc Oxide (I)

Coupling Coefficients and Elastic Constants of Caesium Halides

Surface and Calorimetric Behavior of N,N-Dimethylacetamide with n-Alkanols or 2-Alkanols

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