Phonon Resonances Induced by Pb in KCl Studied by Means of Thermal Conductivity and Ionic Thermocurrent Techniques
Rivista
Phonon Scattering in Condensed Matter
1980, pp 255-258
Autori
M. Locatelli, E. Zecchi
Service des Basses Températures, Centre d’Etudes Nucléaires de Grenoble, France
M. Locatelli, E. Zecchi
Service des Basses Températures, Centre d’Etudes Nucléaires de Grenoble, France
R. Capelletti
Gruppo Nazionale di Struttura della Materia dcl CNR, Istituto di Fisica dell’Università, Parma, Italy
Gruppo Nazionale di Struttura della Materia dcl CNR, Istituto di Fisica dell’Università, Parma, Italy
Résumé – La mesure de la conductivité thermique entre 0,05 et 100 K est utilisée pour étudier la croissance des phases de Suzuki dans KCIPb, en fonction du temps de recuit (220 OC) aux dépens des dipoles impuretés-lacune (I.L.). Des mesures parallèles de thermocourants ioniques sont faites pour determiner indépendamment la concentration des dipoles I.L. soit après les recuits, soit dans des échantillons trempes avec différentes concentrations de plomb (1,2-144 ppm).
On utilise différents modéles pour analyser les courbes expérimentales K(T), d’ou l’on déduit les dimensions et la forme des agglomérés de la phase de Suzuki. Un nouveau modèle phénoménologique est propose pour f’interaction phonon-dipoles (1.L.).Abstract. – Thermal conductivity (K) measurements in the range 5 x 10-*-lo0 K are exploited to analyze the Suzuki-like phase (S.L.P.) occlusions growing for increasing annealing times at 220 OC at the expenses of impurity vacancy (I.V.) dipoles. Parallel ionic thermocurrents I.T.C. are used to monitor independently the concentration of I.V. dipoles both along the I.V. -P S.L.P. conversion and in quenched samples containing different
Pb amounts (1.2-144 ppm).
Different models are used to fit the experimental K vs. Tcurves and to obtain the size and the shape of the growing S.L.P. occlusions. A new phenomenological model is proposed for the phonon-resonance, induced by I.V. dipoles, which fits nicely the K curves for different Pb concentrations.
On utilise différents modéles pour analyser les courbes expérimentales K(T), d’ou l’on déduit les dimensions et la forme des agglomérés de la phase de Suzuki. Un nouveau modèle phénoménologique est propose pour f’interaction phonon-dipoles (1.L.).Abstract. – Thermal conductivity (K) measurements in the range 5 x 10-*-lo0 K are exploited to analyze the Suzuki-like phase (S.L.P.) occlusions growing for increasing annealing times at 220 OC at the expenses of impurity vacancy (I.V.) dipoles. Parallel ionic thermocurrents I.T.C. are used to monitor independently the concentration of I.V. dipoles both along the I.V. -P S.L.P. conversion and in quenched samples containing different
Pb amounts (1.2-144 ppm).
Different models are used to fit the experimental K vs. Tcurves and to obtain the size and the shape of the growing S.L.P. occlusions. A new phenomenological model is proposed for the phonon-resonance, induced by I.V. dipoles, which fits nicely the K curves for different Pb concentrations.
Enzo Zecchi 
Rispondi