title: Growth and Optical Properties of LixNa1-xBa12(BO3)7F4Fluoride Borates with "Antizeolite" Structure.
abstract: Studied LixNa1-xBa12(BO3)7F4(P42bc) solid solution belongs to the new class of "antizeolite" borates with [Ba12(BO3)6]6+cation pattern, which contains channels filled by anionic clusters. Optical-quality crystals were grown from the compositions with different sodium-lithium ratio. The results of Rietveld refinement based on powder data demonstrate linear increase of parameter a and unit cell volume with Na/(Na + Li) ratio in cation site. Parameter c is less sensitive to the changes in stoichiometry, which is consistent with channel topology of LixNa1-xBa12(BO3)7F4structure. Distinctive feature of LixNa1-xBa12(BO3)7F4crystals is their deep purple color, which is due to both hole-type and electron-type centers. Crystals are characterized by linear dichroism effect.
authors.affiliation: Novosibirsk State University , 630090 Novosibirsk, Russia.|Novosibirsk State Academy of Architecture and Arts , 630099 Novosibirsk, Russia.
authors.forename: Tatyana B
authors.identifier: http://orcid.org/0000-0003-3100-5210
authors.initials: TB
authors.lastname: Bekker
authors.affiliation: Novosibirsk State University , 630090 Novosibirsk, Russia.
authors.forename: Sergey V
authors.identifier: http://orcid.org/0000-0003-2936-0694
authors.initials: SV
authors.lastname: Rashchenko
authors.forename: Vladimir P
authors.identifier: http://orcid.org/0000-0001-5631-7689
authors.initials: VP
authors.lastname: Solntsev
authors.forename: Alexander P
authors.initials: AP
authors.lastname: Yelisseyev
authors.affiliation: Novosibirsk State University , 630090 Novosibirsk, Russia.
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Kragzhda
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Bakakin
authors.affiliation: Novosibirsk State University , 630090 Novosibirsk, Russia.
authors.forename: Yuriy V
authors.initials: YV
authors.lastname: Seryotkin
authors.forename: Alexander E
authors.initials: AE
authors.lastname: Kokh
authors.affiliation: Novosibirsk State University , 630090 Novosibirsk, Russia.
authors.forename: Konstantin A
authors.identifier: http://orcid.org/0000-0003-1967-9642
authors.initials: KA
authors.lastname: Kokh
authors.affiliation: Novosibirsk State University , 630090 Novosibirsk, Russia.
authors.forename: Artem B
authors.initials: AB
authors.lastname: Kuznetsov