Publication: Oxidative thermal conversion of hydrothermal derived precursors toward the mixed-metal cobaltite spinel oxides (Znco<inf>2</inf>o<inf>4</inf> and nico<inf>2</inf>o<inf>4</inf>): In-situ investigation by synchrotron-radiation xrd and xas techniques
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Issued Date
2021-10-01
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ISSN
20734352
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2-s2.0-85118261995
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Mahidol University
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SCOPUS
Bibliographic Citation
Crystals. Vol.11, No.10 (2021)
Suggested Citation
Wanchai Deeloed, Yuranan Hanlumyuang, Wanwisa Limphirat, Songwut Suramitr, Kantapat Chansaenpak, Pongsakorn Kanjanaboos, Suttipong Wannapaiboon, Worawat Wattanathana Oxidative thermal conversion of hydrothermal derived precursors toward the mixed-metal cobaltite spinel oxides (Znco<inf>2</inf>o<inf>4</inf> and nico<inf>2</inf>o<inf>4</inf>): In-situ investigation by synchrotron-radiation xrd and xas techniques. Crystals. Vol.11, No.10 (2021). doi:10.3390/cryst11101256 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/76502
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Title
Oxidative thermal conversion of hydrothermal derived precursors toward the mixed-metal cobaltite spinel oxides (Znco<inf>2</inf>o<inf>4</inf> and nico<inf>2</inf>o<inf>4</inf>): In-situ investigation by synchrotron-radiation xrd and xas techniques
Abstract
In-situ investigations of structural transitions during the thermal-oxidative event of mixedmetal spinel oxide precursors, the so-called nickel-(NCO) and zinc-containing (ZCO) cobaltite spinel precursors, were investigated to understand the formations of the derived NiCo2O4 and ZnCo2O4 spinel oxides, respectively. In-situ XRD investigation revealed that emerged temperatures for spinel oxide phase were between 325 and 400◦C, depending on the cationic substituent. It indicated that the emerged temperature correlated with the absolute octahedral site preference energy (OSPE) of those cations that participated in the development of the spinel framework. Moreover, the incorporated nickel and zinc in the precursors was beneficial for inhibiting the occurrence of the undesired CoO phase. Time-resolved X-ray absorption spectroscopic (TRXAS) data suggested the local structure rearrangement of nickel and zinc throughout the calcination process, which differed from the behavior of single-metal cobalt system. The essential information reported herein provides a benefit to control the cationic distribution within spinel materials, leading to the tunable physical and chemical properties.