First-principles study of electronic structures, thermodynamic, and thermoelectric properties of the new rattling Full Heusler compounds Ba2AgZ (Z = As, Sb, Bi)
Document title: First-principles study of electronic structures, thermodynamic, and thermoelectric properties of the new rattling Full Heusler compounds Ba2AgZ (Z = As, Sb, Bi)
Journal: Revista mexicana de física
Database: PERIÓDICA
System number: 000447361
ISSN: 0035-001X
Authors: 1
1
1
1
2
2
Institutions: 1Universite de Sidi Bel Abbes, Sidi Bel-Abbes. Argelia
2Universite d’Artois, Faculte des Sciences Jean Perrin, Arras. Francia
Year:
Season: Nov-Dic
Volumen: 67
Number: 6
Country: México
Language: Inglés
Document type: Artículo
Approach: Analítico, teórico
English abstract The ab initio calculations based on the density functional theory (DFT) using the self-consistent Full potential linearized augmented plane wave (FPLAPW) method were performed to explore the electronic structures, thermodynamic and thermoelectric properties of new rattling Full Heusler alloys Ba2AgZ (Z = As, Sb, Bi). Results showed that the AlCu2Mn-type structure state is energetically the most stable structure. The results show that the electronic property of these cubic Rattling Heusler alloys has a semiconducting behavior with indirect band gaps Eg (L-Δ). The predicted band gaps were found to be 0.566, 0.548, and 0.433 eV for Z = As, Sb, and Bi, respectively. The thermodynamic properties comprising the thermal expansion coefficient, heat capacity, entropy and Debye temperature parameter were evaluated at various pressures from 0 to 15 GPa. Thermoelectric properties of the Ba2AgZ (Z = As, Sb, Bi) materials are additionally computed over an extensive variety of temperatures, and it is discovered that all compounds exhibit ultralow thermal conductivity, good Seebeck coefficients, and large high power factors, thus resulting they are suitable for use in thermoelectric device applications
Disciplines: Física y astronomía
Keyword: Termodinámica y física estadística,
Compuestos de Heusler,
Teoría del funcional de la densidad (DFT),
Estructuras electrónicas,
Propiedades termodinámicas,
Propiedades termoeléctricas
Keyword: Thermodynamics and statistical physics,
Heusler compounds,
Density functional theory (DFT),
Electronic structures,
Thermodynamic properties,
Thermoelectric properties
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