Logarithmic derivative reflectance spectra of BaO and SrO

Abstract

Experimental studies of both reflection and wavelength derivation reflection spectra from freshly cleaved SrO and BaO crystals at 55 K are presented. The data are interpreted in a manner consistent with optical data on MgO and CaO crystal surfaces, in terms of I?-, X-, and L-excitons.Es werden experimentelle Untersuchungen der R*eflexionsspektren und der nach der Wellenlange abgeleiteten Reflexionsspektren an frisch gespaltenen SrO-und BaO-Kristallen bei 55 K durchgefiihrt. Die Werte werden mittels I'-, X-und L-Exzitonen in einer Weise interpretiert, die mit optischen Daten an MgO-und CaO-Kristalloberflllchen konsistent ist.

Impact of Mg content on native point defects in MgxZn1−xO (0 ≤ x ≤ 0.56)

“…33,34 NBE energies in Fig. 1 increase linearly with Mg content up to x = 0.52, consistent with theory 35 and other reports, [36][37][38] deviating upward for x = 0.56, near the crossover from wurtzite to rocksalt structure. SPS spectra provided defect level positions in the bandgap for each of the alloys.…”

Electron–hole excitations and optical spectra of bulk SrO from many-body perturbation theory

“…Ref. [64] has concluded the direct band gap of 5.9 eV at C. Our calculated fundamental gap within the GWA is in good agreement with the experiment results in Refs. [62][63][64].…”

“…The exciton binding energy is considered to be small, and the experimental direct band gap is estimated as about 6.0 eV [63]. The exciton binding energy is measured experimentally around 0.2-0.3 eV at high-symmetry points of the Brillouin zone [64]. Ref.…”

Behavior of hydrogen in wide band gap oxides

“…32͒ are given in Table I, compared to the experimental values [36][37][38][39][40] and those from GGA. 41 O 9 , the WDA band gap still needs improvement, the reason for the disagreement is being studied.…”