TY - JOUR
T1 - Synthesis, crystal structures and photoluminescence properties of new oxyborates, Mg5NbO3(BO3)3 and Mg5TaO3(BO3)3, with novel warwickite-type superstructures
AU - Kawano, Tetsuya
AU - Yamane, Hisanori
N1 - Funding Information:
This work was supported in part by the Global COE Program “Materials Integration, Tohoku University” and by a Grant-in-Aid for Scientific Research (B) (No. 21350113 , 2009) from the Ministry of Education, Culture, Sports and Technology (MEXT), Japan.
PY - 2011/9
Y1 - 2011/9
N2 - Single crystals of new oxyborates, Mg5NbO3(BO 3)3 and Mg5TaO3(BO3) 3, were prepared at 1370 °C in air using B2O 3 as a flux. They were colorless and transparent with block shapes. X-ray diffraction analysis of the single crystals revealed Mg 5NbO3(BO3)3 and Mg 5TaO3(BO3)3 to be isostructural. The X-ray diffraction reflections were indexed to the orthorhombic Pnma (No. 62) system with a=9.3682(3) Å, b=9.4344(2) Å, c=9.3379(3) Å and Z=4 for Mg5NbO3(BO3)3 and a=9.3702(3) Å, b=9.4415(3) Å, c=9.3301(2) Å and Z=4 for Mg5TaO3(BO3)3. The crystal structures of Mg5NbO3(BO3)3 and Mg5TaO3(BO3)3 are novel warwickite-type superstructures having ordered arrangements of Mg and Nb/Ta atoms. Polycrystals of Mg5NbO3(BO3)3 prepared by solid state reaction at 1200 °C in air showed broad blue-to-green emission with a peak wavelength of 470 nm under 270 nm ultraviolet excitation at room temperature.
AB - Single crystals of new oxyborates, Mg5NbO3(BO 3)3 and Mg5TaO3(BO3) 3, were prepared at 1370 °C in air using B2O 3 as a flux. They were colorless and transparent with block shapes. X-ray diffraction analysis of the single crystals revealed Mg 5NbO3(BO3)3 and Mg 5TaO3(BO3)3 to be isostructural. The X-ray diffraction reflections were indexed to the orthorhombic Pnma (No. 62) system with a=9.3682(3) Å, b=9.4344(2) Å, c=9.3379(3) Å and Z=4 for Mg5NbO3(BO3)3 and a=9.3702(3) Å, b=9.4415(3) Å, c=9.3301(2) Å and Z=4 for Mg5TaO3(BO3)3. The crystal structures of Mg5NbO3(BO3)3 and Mg5TaO3(BO3)3 are novel warwickite-type superstructures having ordered arrangements of Mg and Nb/Ta atoms. Polycrystals of Mg5NbO3(BO3)3 prepared by solid state reaction at 1200 °C in air showed broad blue-to-green emission with a peak wavelength of 470 nm under 270 nm ultraviolet excitation at room temperature.
KW - Crystal structure analysis
KW - Magnesium niobium (V) oxyborate
KW - Magnesium tantalum (V) oxyborate
KW - Photoluminescence
KW - Synthesis
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=80052448814&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80052448814&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2011.07.022
DO - 10.1016/j.jssc.2011.07.022
M3 - Article
AN - SCOPUS:80052448814
VL - 184
SP - 2466
EP - 2471
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 9
ER -