TY - JOUR AU - Burak, Ya.V. AU - Adamiv, V.T. AU - Teslyuk, I.M. AU - Moroz, I.Ye. AU - Malynych, S.Z. PY - 2022/03/13 Y2 - 2024/03/29 TI - What is the true value of bulk band gap of lithium tetraborate single crystal? Array JF - Physics and Chemistry of Solid State JA - Phys. Chem. Sol. State VL - 23 IS - 1 SE - Scientific articles (Physics) DO - 10.15330/pcss.23.1.113-119 UR - https://journals.pnu.edu.ua/index.php/pcss/article/view/5369 SP - 113-119 AB - <p>Substantial variances in the bulk band gap of lithium tetraborate single crystal determined from numerous theoretical calculations as well as from experimental measurements give rise to the problem what is the true value of <em>E<sub>g</sub></em> for that crystal. In this review, we analyze in detail all available theoretical and experimental data regarding the bulk band gap published by different authors and suggest that the experimental value of =&nbsp;(7.5&nbsp;±&nbsp;0.3)&nbsp;eV determined from the optical absorption edge is the most appropriate value. This is in good agreement with <em>E<sub>g</sub>&nbsp;</em>=&nbsp;7.5&nbsp;eV calculated via modified linear combination of atomic orbitals (LCAO) method.</p> ER -