Tailoring band gap and thermal diffusivity of nanostructured phase-pure ZnAl2O4 by direct spark plasma sintering synthesis

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A rapid, one-step synthesis of pristine ZnAl2O4 by spark plasma sintering has been developed in this work. Using inexpensive reagents (ZnO and Al2O3) and the direct synthesis approach, a total synthesis time of five minutes was achieved. Varying the sintering parameters allows for tailoring of the density, crystallite size, and band gap. An extensive parameter study was performed to understand the formation of impurities at different conditions, and also to investigate the effect of using either γ– or α-Al2O3 as the aluminum source. The experimental results reveal that a heating ramp of 200 °C/min up to 1000 °C, and immediate cooling thereafter, produces pristine ZnAl2O4. The thermal diffusivity and band gap were found to be dependent on the synthesis conditions employed. The synthesis approach in this work provides a protocol for controlled preparation of bulk ZnAl2O4 with tunable properties.

TidsskriftJournal of Solid State Chemistry
Sider (fra-til)45-52
Antal sider8
StatusUdgivet - dec. 2017

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