The thermal expansion of rubidium chloride at low temperatures

Cooper, R. F.; Yates, B.

doi:10.1088/0022-3719/4/8/001

Cited by 10 publications

(1 citation statement)

References 17 publications

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“…Negative y ( T ) may also be expcct.ed for RbCl and RbBr in agreement with the measurements and estimates made by White [5] for Y(T = 0). The experimental dat,a of RbCl by Cooper and Yates [7] and of RbBr by James and Yatcs [6] deviat,e of the order of 7% from the theoretical predictions. However, more refined results of RbBr obtained by White (1968) [5] indicate that the discrepancy is reduced for this crystal.…”

Section: Numerical Calculationsmentioning

confidence: 74%

Dispersion Relations of Mode Grüneisen Parameters in Rubidium Halides

Jex

1974

Physica Status Solidi (b)

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Dispersion relations of microscopic mode Griineisen parameters have been cnlcalated from a n evaluation of a shell model to third order. Leading terms such as the anhnrnionic shellshell interaction between first and second neighbours and Coulomb contril)ut,ions are taken into account. In t,he phonon dispersion curves breathing terms are included. The thermal expansion and mean Griineisen constants of RbF, RbCI. RbBr, and RbI are analysed with this model. Die Dispersionsreliitionen der mikroskopischen Griineisen-Parameter von RbF, RbC1, RbBr und R b J nurden aus eineni anharmonisch erweiterten Schalenniodell berechnet. Als Hnuptbeitrage wcrden die anharmonische Schale~Srhale-Weclisel~irknng z\vischen crsten und zweiten Gitternachbarn rind die Coiilonib-Beitrage berucksichtigt. Das RIodcll fur die Gitterdynamik enthalt auDerdem die ,,breat,hing"-8nteile. Die niikroskopischen Griineisen-Parameter der Rabidiumhalogenide werden mit experinlentellen Dat.en ails opt,ischen, Ultra~chall-und Ne~itronenmessungen verglichen. Der lineare thermische Ausdehnungskoeffizient und der mittlere ~riineisen-Parxmeter werden ebenfalls analysiert.

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Section: Numerical Calculationsmentioning

confidence: 74%

Dispersion Relations of Mode Grüneisen Parameters in Rubidium Halides

Jex

1974

Physica Status Solidi (b)

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Theory of the Anomalous Temperature Dependence of C₁₂ in NaCl‐Like Structure Solids Direct Observation of Phonon—Lattice Interactions

Shrivastava

1980

Physica Status Solidi (b)

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The basic quantum theory is presented for the temperature dependence of the elastic constants of solids. The phonon-lattice interaction is invoked to explain the anomalous temperature dependence of CI2 in NaC1-like structure alkali halides. The calculated values of dCl,/dT for lithium and sodium halides are negative and dC12/dT for potassium and rubidium halides (except KF) are positive (showing an anomalous temperature dependence of C12). These results are in excellent agreement with available experimental data.On presente un calcul quantique fondamental sur la variation des constantes Blastiques des solides en fonction de la temperature. On attribue la dependence anomale des parametres C12 pour les haloides alcalins du type NaCl it I'interaction phonon-reseau. Les valeurs de dCl,/dT ainsi obtenues sont negatives pour le lithium et le sodium, mais positives (et par consequent anomales) pour les haloi'des ( s a d KF) du potassium et du rubidium. Les resultats obtenus sont en tres bon accord avec les valeurs experimentales que I'on a pu trouver.

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