Acharya, Aradhana and Chanda, Barnasree and Saminathan, Madhuvathani and Perumal, Suresh and Jayanthi, K and Annapurna, K and Krishnan, N M Anoop and Gahtori, Bhasker and Naskar, Milan Kanti and Ghosh, Srabanti and Allu, Amarnath R and Mishra, Suman Kumari (2024) Influence of metal organic framework glasses on thermoelectric properties of AgSb0.96Zn0.04Te2 alloy. JOURNAL OF NON-CRYSTALLINE SOLIDS, 627 (122816). pp. 1-8. ISSN 0022-3093

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Abstract

In recent years, a significant number of chalcogenides-based thermoelectric (TE) materials have been investigated theoretically and experimentally. However, the efficiency of TE materials is often limited by physical and chemical stability issues. Therefore, it is crucial to identify additive materials that can reduce thermal conductivity and improve the efficiency of crystalline TE materials. One well-known approach to lower thermal conductivity is introducing porosity into the material structure, which helps scatter phonon energy. Metal -organic framework (MOF) crystalline materials, known for their porosity and physical and chemical stability, offer unique advantages in TE applications. In this study, we investigate the influence of 20 weight% amorphous Zeolitic Imidazolate Framework (ZIF)-62 to p -type AgSb0.96Zn0.04Te2 (ASTZ), a well-known TE material. We synthesized composites, ASTZ, ASTZ-Zn, and ASTZ-Co, by sintering ASTZ with amorphous ZIF-62(Zn) and ZIF-62 (Co) respectively. The addition of amorphous ZIF-62(Zn) leads to a significant enhancement in the Seebeck coefficient of ASTZ increasing from 151 mu V/K to 229 mu V/K at 586 K. Moreover, the thermal conductivity of the ASTZ TE materials drops drastically from 0.491 Wm -1 K-1 to around 0.22 Wm -1 K-1 at 623 K with the addition of either amorphous ZIF-62(Zn) or ZIF-62(Co). Remarkably, ASTZ containing amorphous ZIF-62(Zn) achieves a maximum thermoelectric figure of merit (zTmax) of approximately 0.078 at 573 K, surpassing any MOF-based thermoelectric material reported to date. These findings highlight the potential of amorphous ZIF-62 as an effective additive for enhancing the properties of thermoelectric materials.

Item Type:	Article
Subjects:	Crystal Chemistry, Thermodynamics, Phase Equilibria
Divisions:	Glass
Depositing User:	Ms Upasana Sahu
Date Deposited:	02 May 2024 09:15
Last Modified:	02 May 2024 09:15
URI:	http://cgcri.csircentral.net/id/eprint/5693

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