TY - JOUR
T1 - Preparation, crystal structure and photoluminescence of lithium magnesium manganese borate solid solutions, LiMg1-xMnxBO3
AU - Yamane, Hisanori
AU - Kawano, Tetsuya
AU - Fukuda, Kentaro
AU - Suehiro, Takayuki
AU - Sato, Tsugio
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid for Scientific Research (B) (No. 21350113 , 2009) and the Global COE Program “Materials Integration, Tohoku University” from the Ministry of Education, Culture, Sports and Technology (MEXT), Japan .
PY - 2012/1/25
Y1 - 2012/1/25
N2 - LiMg1-xMnxBO3 solid solutions were prepared by solid state reaction in Ar at 800 °C. The X-ray diffraction reflections of the solid solutions with the manganese content x from 0 to 0.5 were indexed with monoclinic cells (space group C2/c (No. 15)). The solid solution of x = 0.75 has the hexagonal structure of LiMnBO3 (space group P6 (No. 174)). Colorless transparent platelet single crystals of LiMg 0.5Mn0.5BO3 were prepared by heating a polycrystalline sample of x = 0.50 with a Li2BO2 flux and by slow cooling from 900 °C. The crystal structure was analyzed by single crystal X-ray diffraction (monoclinic, C2/c, a = 5.1820(2) , b = 8.9241(4) , c = 10.1529(6) , β = 91.5824(18)°, R1 = 0.0271, wR2 = 0.0645, and S = 1.219 for all data). Mn2+ and Mg2+ atoms statistically occupy a 5-fold coordinate site of oxygen trigonal bipyramid. Monoclinic LiMg1-xMnxBO3 solid solutions emit red light with a peak wavelength λem = 682-696 nm due to d-d transition under visible light of 428 nm at room temperature. The radiation lifetimes decreased from 24 ms to 0.3 ms with increasing x from 0.02 to 0.30. Stronger red emission of 698 nm was observed for the sample of x = 0.10 by excitation of ultraviolet light λex = 200 nm.
AB - LiMg1-xMnxBO3 solid solutions were prepared by solid state reaction in Ar at 800 °C. The X-ray diffraction reflections of the solid solutions with the manganese content x from 0 to 0.5 were indexed with monoclinic cells (space group C2/c (No. 15)). The solid solution of x = 0.75 has the hexagonal structure of LiMnBO3 (space group P6 (No. 174)). Colorless transparent platelet single crystals of LiMg 0.5Mn0.5BO3 were prepared by heating a polycrystalline sample of x = 0.50 with a Li2BO2 flux and by slow cooling from 900 °C. The crystal structure was analyzed by single crystal X-ray diffraction (monoclinic, C2/c, a = 5.1820(2) , b = 8.9241(4) , c = 10.1529(6) , β = 91.5824(18)°, R1 = 0.0271, wR2 = 0.0645, and S = 1.219 for all data). Mn2+ and Mg2+ atoms statistically occupy a 5-fold coordinate site of oxygen trigonal bipyramid. Monoclinic LiMg1-xMnxBO3 solid solutions emit red light with a peak wavelength λem = 682-696 nm due to d-d transition under visible light of 428 nm at room temperature. The radiation lifetimes decreased from 24 ms to 0.3 ms with increasing x from 0.02 to 0.30. Stronger red emission of 698 nm was observed for the sample of x = 0.10 by excitation of ultraviolet light λex = 200 nm.
KW - Crystal growth
KW - Crystal structure
KW - Luminescence
KW - Nuclear reactor materials
KW - Optical materials
KW - Oxide materials
KW - Solid state reaction
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=80555130986&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80555130986&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2011.09.069
DO - 10.1016/j.jallcom.2011.09.069
M3 - Article
AN - SCOPUS:80555130986
VL - 512
SP - 223
EP - 229
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1
ER -