Novikov, Vladimir and Pilipenko, Kirill and Matovnikov, Aleksandr and Mitroshenkov, Nikolay and Plokhikh, Igor and Tyablikov, Aleksandr and Shevelkov, Andrey (2018) Structure-Related Thermal Properties of Type-VII Clathrates SrNi2P4 and BaNi2P4 at Low Temperature. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 255 (8): 1800067. ISSN 0370-1972, 1521-3951
Full text not available from this repository. (Request a copy)Abstract
Heat capacity C-P(T) (2-300K) and unit cell parameters a(T), b(T), and c(T) (5-300K) of type-VII clathrates SrNi2P4 and BaNi2P4 have been investigated experimentally. The studied compounds are prepared by a two-stage ampoule synthesis. Diffuse maxima of C-P(T) near 5K along with anomalies in temperature dependencies of unit cell parameters below 10K are observed and related to the influence of two-level systems in guest-atom substructures. Joint analysis of temperature dependencies of heat capacity and unit cell volume of both clathrates within the frames of the Debye-Einstein model allowed determining characteristic temperatures of the clathrate frameworks and guest atoms as well as parameters of the two-level systems. The relationships of the obtained characteristics and the peculiarities of the crystal structures of SrNi2P4 and BaNi2P4 are discussed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | THERMOELECTRIC PROPERTIES; EXPANSION; GROUP-14; HEAT; CU; clathrates; heat capacity; lattice dynamics; low temperature; thermal expansion; two-level systems |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Arno Pfitzner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Mar 2020 10:37 |
| Last Modified: | 10 Mar 2020 10:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14161 |
Actions (login required)
 |
View Item |
