Published September 15, 1989
| Version v1
Journal article
Thermal conductivity of La3-xRxS4 where R=Sm, Eu, and Yb
- 1. Ames Laboratory and Department of Materials, Science and Engineering, Iowa State University, Ames, Iowa 50011 (USA)
Description
The thermal diffusivity values of La2.7Sm0.3S4 , La2.3Sm0.7S4 , La2.7Eu0.3S4 , La2.2Eu0.8S4 , La2.8Yb0.2S4 , and La2.3Yb0.7S4 were measured by the flash diffusivity method from 400 to 1000 degree C. The values ranged from 0.007 to 0.018 cm2 /s. The thermal conductivities of the six ternary rare-earth sulfides were calculated from the thermal diffusivity data and ranged from 10.7 to 31.6 mW/cm degree C. Of the alloys measured, La2.2Eu0.8S4 had the highest thermoelectric figure of merit at 1000 degree C (0.52x10-3 degree C-1). All of the samples had an oxysulfide present at the grain boundaries which degraded their high-temperature performance
Additional details
Publishing Information
- Journal Title
- Journal of Applied Physics
- Journal Volume
- 66
- Journal Issue
- 6
- Series
- J. Appl. Phys.
- Journal Page Range
- 2356-2362
- ISSN
- 0021-8979
- CODEN
- JAPIA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 21005676
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- CHEMICAL ANALYSIS; EUROPIUM SULFIDES; LANTHANUM SULFIDES; SAMARIUM SULFIDES; THERMAL CONDUCTIVITY; THERMAL DIFFUSIVITY; THERMOELECTRIC PROPERTIES; YTTERBIUM SULFIDES
- Descriptors DEC
- CHALCOGENIDES; ELECTRICAL PROPERTIES; EUROPIUM COMPOUNDS; LANTHANUM COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SAMARIUM COMPOUNDS; SULFIDES; SULFUR COMPOUNDS; THERMODYNAMIC PROPERTIES; YTTERBIUM COMPOUNDS