On the nature of color of the new borates with the 'anti-zeolite' structure

Bekker, T. B.; Solntsev, V. P.; Rashchenko, S. V.; Yelisseyev, A. P.; Davydov, A. V.; Kragzhda, A. A.; Kokh, A. E.; Kuznetsov, A. B. and Park, SoHyun (19. February 2018): On the nature of color of the new borates with the 'anti-zeolite' structure. In: Inorganic chemistry, Vol. 57, No. 5: pp. 2744-2751

Abstract

Crystals of the MnxBa12(BO3)8–2xF8x phase were grown from a high-temperature solution. This new fluoride borate is built of positively charged [Ba12(BO3)6]6+ blocks, the so-called “anti-zeolite” pattern. Using X-ray single-crystal diffraction, the bulk atomic arrangement in the centrosymmetric tetragonal unit cell in I4/mcm could be elucidated. Crystals of the (MnF6)4– group-containing solid solution MnxBa12(BO3)8–2xF8x are dark brown in color in contrast to the differently colored crystals of (LiF4)3– group-containing “anti-zeolite” LiBa12(BO3)7F4 (P42bc). According to the electron spin resonance and optical spectroscopic investigation, the absorption spectrum of LiBa12(BO3)7F4 crystals results from the absorption of light by both exciton and free charge carriers and can be tuned by varying the initial composition of the high-temperature solution.

• Item Type: Journal article
• Form of publication: Publisher's Version
• Faculties: Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science
• Subjects: 500 Science > 530 Physics; 500 Science > 540 Chemistry; 500 Science > 550 Earth sciences and geology
• ISSN: 0020-1669
• Language: English