Инд. авторы:	Bekker T.B., Solntsev V.P., Yelisseyev A.P., Rashchenko S.V.
Заглавие:	Fluoride Borates with [(BO3)F]4- → [F4]4- Anionic Isomorphism and X-ray Sensitivity
Библ. ссылка:	Bekker T.B., Solntsev V.P., Yelisseyev A.P., Rashchenko S.V. Fluoride Borates with [(BO3)F]4- → [F4]4- Anionic Isomorphism and X-ray Sensitivity // Crystal Growth & Design. - 2016. - Vol.16. - Iss. 8. - P.4493-4499. - ISSN 1528-7483. - EISSN 1528-7505.
Внешние системы:	DOI: 10.1021/acs.cgd.6b00615; SCOPUS: 2-s2.0-84982690215; WoS: 000380968200039;
Реферат:	eng: Crystals of Ba7(BO3)4-yF2+3y and Ba4-xSr3+x(BO3)4-yF2+3y solid solutions display a phenomenon that has never been described for borates before - X-ray irradiation induces strong absorption in the visible range and, as the result, coloring of the crystals up to dark purple. The induced absorption can be removed by illumination with a wavelength of 300-400 nm. Owing to this phenomenon, these crystals are promising sensors applicable to fixing X-ray images. With the use of electron spin resonance and optical spectroscopy, it has been found that the formation of color centers is connected with the [(BO3)F]4- and [F4]4- tetrahedral groups, which are the distinguishing feature of Ba7(BO3)4-yF2+3y and Ba4-xSr3+x(BO3)4-yF2+3y structure. Partial replacement of Ba2+ to Sr2+ in the crystal lattice of Ba4-xSr3+x(BO3)4-yF2+3y leads to the formation of the stable electron-hole pairs under X-ray irradiation. The opportunity to vary the cationic and anionic sublattice composition within the same crystal structure becomes a prospective tool to vary physical and chemical properties of the phosphors. © 2016 American Chemical Society.
Ключевые слова:	X-ray sensitivity; Tetrahedral groups; Strong absorptions; Physical and chemical properties; Partial replacement; Optical spectroscopy; Induced absorption; Electron hole pairs; Magnetic moments; Irradiation; Crystal structure; Color centers; Electron spin resonance spectroscopy;
Издано:	2016
Физ. характеристика:	с.4493-4499