Experimental determination of solidified lithium disilicate crystal bandgap energy using EELS and XPS
Experimental determination of solidified lithium disilicate crystal bandgap energy using EELS and XPS
复制标题
DOI：
10.1111/jace.17221
复制
发表时间：
2020-09
影响因子：
3.9
通讯作者：
M. Tashiro;Sohei Sukenaga;S. Kawanishi;Yohei K. Sato;Y. Takakuwa;H. Shibata
中科院分区：
文献类型：
--
作者：
M. Tashiro;Sohei Sukenaga;S. Kawanishi;Yohei K. Sato;Y. Takakuwa;H. Shibata
自20世纪50年代以来，由于其优异的化学和物理耐久性，二硅酸锂（LS2）一直是玻璃陶瓷的重要母体成分。此外，通过改变组成和结晶度可以获得广泛的电性能。带隙能是设计新型硅酸锂基材料的关键电学性质之一。在这项研究中，利用电子能量损失谱和X射线光电子能谱对合成的LS2晶体的带隙能量进行了评估。这两种技术明确地确定了LS2的带隙能量为7.7 ~ 7.8 eV，处于真空紫外区。这证实了LS2晶体的绝缘性质。
Lithium disilicate (LS2) has been a crucial parent composition for glass‐ceramics since the 1950s because of its excellent chemical and physical durability. In addition, a wide range of electrical properties can be obtained by changing the composition and crystallinity. Bandgap energy is one of the critical electrical properties for designing new lithium silicate‐based materials. In this study, the bandgap energy of a synthesized LS2 crystal is evaluated using electron energy‐loss spectroscopy and X‐ray photoelectron spectroscopy. These two techniques unambiguously establish that the bandgap energy of LS2 is 7.7‐7.8 eV, which is in the vacuum ultraviolet region. This confirms the insulating nature of the LS2 crystal.