کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1516532 | 1511558 | 2012 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: UV–visible absorption spectrum determination of optical energy gaps of α and β lithium nitrides UV–visible absorption spectrum determination of optical energy gaps of α and β lithium nitrides](/preview/png/1516532.png)
It is well known that a high pressure can induce α–β phase transformation of lithium nitride (Li3N). However, this work demonstrated that a reverse phase transformation of Li3N 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 (Eg) 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.
Figure optionsDownload as PowerPoint slideHighlights
► Reverse phase transformation of Li3N from β to α was revealed.
► Optical energy gap of β-Li3N was first determined by experiments.
► Measured energy gaps demonstrated that both α-Li3N and β-Li3N are semiconductors.
Journal: Journal of Physics and Chemistry of Solids - Volume 73, Issue 8, August 2012, Pages 999–1002