Optical properties of bulk high-entropy diborides for solar energy applications

Year: 2023

Authors: Barbarossa S.; Orru R.; Cao G.; Balbo A.; Zanotto F.; Sani E.

Autors Affiliation: Univ Cagliari, Unita Ric Consorzio Interuniv Nazl Sci & Tecnol M, Dipartimento Ingn Meccan Chim & Mat, Via Marengo 2, I-09123 Cagliari, Italy; Univ Ferrara, Corros & Met Study Ctr Aldo Dacco, Engn Dept, G Saragat 4a, I-44122 Ferrara, Italy; CNR INO Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy.

Abstract: So far, the studies regarding the innovative High-Entropy Borides (HEBs), which belong to the more general class of Ultra-high temperature ceramics (UHTCs), have been entirely confined to their fabrication or characterization from the microstructural, mechanical and oxidation resistance viewpoints. In this work, the optical properties of two members of HEBs, i.e. (Hf0.2Zr0.2Ta0.2Mo0.2Ti0.2)B2 and (Hf0.2Nb0.2Ta0.2Mo0.2Ti0.2)B2, are evaluated for the first time to assess their possible utilization in the thermal solar energy field. The bulk samples (96.5 % and 97.4 % dense, respectively) are obtained as single-phase products by Spark Plasma Sintering (1950 degrees C/20 min/20 MPa) starting from powders previously synthesized by Self-propagating High-temperature Synthesis (SHS). The optical characterization, whose results are discussed by comparing HEBs to the individual borides, shows that they are characterized by intrinsic spectral selectivity and low thermal emittance, resulting therefore interesting for high-tempera-ture solar absorbers applications.

Journal/Review: JOURNAL OF ALLOYS AND COMPOUNDS

Volume: 935 (1)      Pages from: 167965-1  to: 167965-9

More Information: One of the authors (S.B.) performed his activity in the framework of the International Ph.D. in Innovation Sciences and Technologies at the University of Cagliari, Italy. E.S thanks CNR-INO technicians Mr. M. D´Uva and Mr. M. Pucci for technical assistance.The present work has been carried out in the framework of the ARCHIMEDES project sponsored by Regione Autonoma della Sardegna (Italy) – Fondo di Sviluppo e Coesione (FSC) 2014-2020 (Cod. RAS: RASSR88309, Cod. CUP: F76C18000980002)
KeyWords: Ultra high temperature high-entropy ceramics; Spark plasma sintering; Optical properties: Solar absorbers; Solar plants; Concentrated solar power
DOI: 10.1016/j.jallcom.2022.167965

Citations: 10
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