Synthesis and Performance of BaAl₂O₄ with a Wide Spectral Range of Optical Absorption

Abstract

Oxygen‐deficient BaAl2O4, with strong optical absorption in the spectra range from 200 to 2500 nm, was prepared by a simple and economic thermal treatment of BaAl2O4 in a H2 gas flow. Further studies found that a molar ratio of oxygen vacancies of about 0.4 % existed in the prepared oxygen‐deficient BaAl2O4 sample. The influence of oxygen vacancies on the electronic band structures and optical absorption of BaAl2O4 are elucidated via first principle calculations. Oxygen vacancies introduce impurity states above the valence band; these impurities expand and enhance the optical absorption of BaAl2O4. This approach is proposed to develop a new type of optical materials and to be applicable to many wide bandgap materials.

Bi-component Cu2O–CuCl composites with tunable oxygen vacancies and enhanced photocatalytic properties

“…It is generally accepted that the oxygen vacancies often play a crucial role in surface applications such as heterogeneous catalysis. Recent studies indicate that higher photocatalysis activity can be achieved by the oxygen vacancies owning to the formation of narrow band gap [47,48]. Thus, the Cu 2 O-CuCl samples cloud present higher catalytic active than that of the Cu 2 O sample, although their have similar specific surface areas (Table 1).…”

Tribological Property of Ni3Al Matrix Composites with Addition of BaMoO4

“…With respect to BaAl 2 O 4 formed during the fabrication process, it is unknown that whether it has a positive or negative influence on lubricating property of the Ni 3 Al matrix composites, since the lubricious performance of aluminate has not been explored. BaAl 2 O 4 , which belongs to the family of aluminate, has been studied for luminescent material and refractory cement applications [14][15][16]. The hexagonal structure of BaAl 2 O 4 consists of cornerconnected AlO 4 tetrahedra forming a tridymite related, tetrahedral framework sub-structure.…”

Synthesis of phosphorescent ceramic pigment BaAl1.7B0.3O4 doped with Eu2+ and Dy3+

“…Previous studies have reported that phosphor emission for this material is related to oxygen vacancies [16,18]. Specifically, BaAl 2 O 4 doped with Eu 2 þ causes no detectable decrease in O 2 À vacancies by H 2 (g), samples do not exhibit luminescence and the graph generated by Raman has an intensity line close to zero [19]. Unfortunately structural distortions due to oxygen vacancies are very difficult to visualize, even with the TEM technique.…”