UV-visible absorption spectrum determination of optical energy gaps of α and β lithium nitrides

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It is well known that a high pressure can induce α-β phase transformation of lithium nitride (Li 3N). However, this work demonstrated that a reverse phase transformation of Li 3N from β to α could occur when it was subjected to heat-treatment at 500 °C in vacuum. Furthermore, the optical properties of α and β lithium nitrides were evaluated by UV-visible spectra. The optical energy gaps (E g) of α and β lithium nitrides, which were determined from the derivative UV-visible spectra, are 1.81±0.01 and 2.14±0.01 eV, respectively. © 2012 Elsevier Ltd.

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Journal of Physics and Chemistry of Solids