Thermal Properties of the Very Low Thermal Conductivity Ternary Chalcogenides Cu4Bi4M9 (M = S, Se)

Published

May 14, 2020

Author(s)

Dean Hobbis, Hsin Wang, Joshua B. Martin, George S. Nolas

Abstract

Temperature-dependent thermal properties of phase-pure polycrystalline ternary chalcogenides Cu4Bi4S9 and Cu4Bi4Se9 are reported. The large unit cell and complex structure results in very low thermal conductivity values (< 0.7 W/m-K at room temperature) for both materials. The lattice contribution, Debye temperatures and Sommerfeld coefficients were obtained from low temperature heat capacity data that also indicated very small electronic contributions to the heat capacity for these materials. Debye temperatures of 297 K and 260 K where obtained for Cu4Bi4S9 and Cu4Bi4Se9, respectively. This study aids in the identification of new non-toxic, earth abundant resistive ternary chalcogenide materials with low thermal conductivity for potential thermal barrier coating and rewriteable storage applications.

Citation

Physica Status Solidi

Pub Type

Journals

Keywords

ternary chalcogenides, thermal properties, structure-property relationships

Citation

Hobbis, D. , Wang, H. , Martin, J. and Nolas, G. (2020), Thermal Properties of the Very Low Thermal Conductivity Ternary Chalcogenides Cu4Bi4M9 (M = S, Se), Physica Status Solidi (Accessed April 26, 2024)