Low Temperature Physics: 41, 469 (2015); https://doi.org/10.1063/1.4922101
Физика Низких Температур: Том 41, Выпуск 6 (Июнь 2015), c. 598-602    ( к оглавлению , назад )

Influence of thermal treatment on thermal properties of adamantane derivatives

D. Szewczyk and A. Jeżowski

W. Trzebiatowski Institute of Low Temperatures and Structure Research Polish Academy of Sciences Okólna 2, Wrocław 50-422, Poland

A.I. Krivchikov

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: krivchikov@ilt.kharkov.ua

J.Ll. Tamarit

Grup de Caracterització de Materials, Departament de Física i Enginyieria Nuclear, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona 08028, Catalonia, Spain

Received February 3, 2015


Heat transport mechanisms present in 2-adamantanone and 1-cyanoadamantane crystals were investigated in a broad temperature range. To characterize scattering processes, thermal conductivity and heat capacity measurements were carried out. A particular care was paid to the cooling rate of specimen which influenced the thermal history of the samples. The experimental results led to a conclusion that under slow cooling the thermal conductivity reaches the highest values and resembles the behavior of ordered molecular crystals. As for fast cooling, the “quenching” resulted in changes in both the structure and the temperature dependence of the thermal conductivity, the latter resembling that of amorphous solids. In heat capacity measurements the thermal history made on samples did not reflect the preliminary findings known from thermal conductivity results, which could imply that the observed mechanisms are more complex.

PACS: 44.35.+c Heat flow in multiphase systems;
PACS: 61.43.–j Disorder solids;
PACS: 65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.

Key words: thermal conductivity, phase transition, thermal treatment, molecular disorder, glassy dynamics.

Published online: April 23, 2015