Mullite‐type EMBO4: synthesis, structural, optical, and vibrational properties of rare tin(II) borates with M = Al and Ga

Author:

Wittmann Sarah1ORCID,Murshed Mohammad Mangir12ORCID,Bilovol Vitaliy3ORCID,Koldemir Aylin4ORCID,Pöttgen Rainer4ORCID,Nielsen Ulla Gro5ORCID,Gesing Thorsten Michael12ORCID

Affiliation:

1. Institute of Inorganic Chemistry and Crystallography University of Bremen Bremen Germany

2. MAPEX Center for Materials and Processes University of Bremen Bremen Germany

3. Laboratorio de Sólidos Amorfos‐INTECIN University of Buenos Aires Buenos Aires Argentina

4. Institute für Anorganische und Analytische Chemie Universität Münster Münster Germany

5. Department of Physics, Chemistry and Pharmacy University of Southern Danmark Odense Denmark

Abstract

AbstractMetal tin‐(II)‐borates are rarely studied mainly due to the susceptibility of either oxidation into tin(IV) or disproportionation into elemental tin(0) and tin(IV). We report mullite‐type SnAlBO4 and SnGaBO4 ceramics produced by conventional solid‐state synthesis in sealed quartz tubes at low pressure of 10–7 MPa. Both compounds are isostructural to PbAlBO4 as confirmed by Rietveld refinements of powder X‐ray data. The crystal structures are highly influenced by the stereochemical activity of the 5s2 lone electron pair of the Sn2+ cation measured by the Wang–Liebau eccentricity parameter. To further consolidate the structural features 119Sn Mössbauer, solid state NMR, Raman, IR and UV/vis spectroscopic measurements are performed. The 119Sn Mössbauer isomer shifts and the quadrupole splitting values confirm the SnO4 coordination and Sn(II) valence states. Solid state 11B, 27Al and 119Sn NMR spectra provided insights into the local crystal‐chemical environment. The vibrational properties are discussed from group theoretical analysis to mode assignments. SnAlBO4 and SnGaBO4, respectively, possess an electronic band gap of 3.73(9) and 3.21(4) eV calculated from the diffuse reflectance UV/Vis spectra.

Publisher

Wiley

Subject

Materials Chemistry,Ceramics and Composites

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