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Nikolic, Jelena
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article
Structure and microstructure characterization of the La2SrB10O19 glass-ceramics
Abstract
<jats:p>The crystal structure of new lanthanum strontium borate glass-ceramics wasrefined by the Rietveld method. The results showed that La2SrB10O19 has themonoclinic crystal structure, space group C2 (No. 5) with a = 11.1170(6), b= 6.5667(3), c = 9.2363(3) ?, ? = 91.481?, V = 674.04(7) ?3, two formulaunits per unit-cell, and density 3.830 g cm?3. The main building units ofthe crystal structure are BO4 tetrahedra and BO3 triangles. Clusterscomposed of [B5O12] form an infinite double layer running perpendicular tothe c-axis. Lanthanum atoms, situated in [B5O12]n layers, are coordinatedwith 10 oxygen atom in a form of LaO10 polyhedra, while Sr atoms, locatedbetween [B5O12]n layers, are coordinated with 8 oxygen atoms in a form ofSrO8 polyhedra. Microstructural measurements contain both crystallite domainsizes and microstrain calculations obtained by the Warren-Averbach and thesimplified integral-breadth methods.</jats:p>