Growth and Optical Properties of LixNa1-xBa12(BO3)7F4 Fluoride Borates with "Antizeolite" Structure

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 r...

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Veröffentlicht in:	Inorganic chemistry 2017-05, Vol.56 (9), p.5411-5419
Hauptverfasser:	Bekker, Tatyana B, Rashchenko, Sergey V, Solntsev, Vladimir P, Yelisseyev, Alexander P, Kragzhda, Alexander A, Bakakin, Vladimir V, Seryotkin, Yuriy V, Kokh, Alexander E, Kokh, Konstantin A, Kuznetsov, Artem B
Format:	Artikel
Sprache:	eng
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Zusammenfassung:	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)7F4 structure. Distinctive feature of LixNa1-xBa12(BO3)7F4 crystals is their deep purple color, which is due to both hole-type and electron-type centers. Crystals are characterized by linear dichroism effect.
ISSN:	1520-510X
DOI:	10.1021/acs.inorgchem.7b00520