Publications by authors named "T B Bekker"
Three NaBa(BO)F crystals were grown in the BaO-BaF-BO-NaO system from three different compositions of high-temperature solution. With the use of optical spectroscopy, energy-dispersive X-ray spectroscopy, and the Schering bridge method it was found that the crystals revealed sharp differences in their optical and dielectric properties. The relative permittivity of the crystals in direction perpendicular to the optical axis reached 319(5).
View Article and Find Full Text PDFThe present study is aimed at unveiling the luminescence potential of BaSr(BO)F (BSBF) crystals doped with Eu, Tb, and Ce. Owing to the incongruent melting character of the phase, the NaF compound was used as a solvent for BSBF crystal growth. The structure of BSBF: Eu with EuO concentration of about 0.
View Article and Find Full Text PDFThe luminescent properties of single crystals and polycrystalline samples of LiBa(BO)F (LBBF) doped and co-doped with Eu, Tb, and Ce have been studied in order to disclose their potential for application in white light-emitting diodes. Deciphering of LBBF:Eu crystal structure (4/) makes it possible to determine the scheme of heterovalent isomorphic substitution 3Ba ← 2Eu + □, □ - vacancy in barium sites. Luminescent properties of LBBF crystals co-doped with Eu, Tb, Ce and Eu, Tb are compared.
View Article and Find Full Text PDFArticle Synopsis
- This course teaches students about how crystals grow, using examples from nature like rocks and even inside our bodies.
- Students learn both the classic and new ways crystals form, and they get to do hands-on activities in a lab.
- They also have the chance to work on a research project and share what they learned at a mini-conference, with helpful resources provided for more exploration.
Background: Although inclusive education is widely discussed, its implementation has not, arguably, been far-reaching. There remains a lack of specific, targeted approaches towards fully including learners with physical and mental impairments in the educational space.
Objectives: This study investigated the extent of the inclusion of learners with autism spectrum disorder (ASD) in three schools in Johannesburg.