Calcium-free solid solutions in the system Ba7F12Cl2-xBrx (x < 1.5), a single-component white phosphor host

摘要

We have recently prepared solid solutions of Ba similar to 6.3Ca similar to 0.7F similar to 12Cl2-xBrx with x ranging from 0 to 2. In this work, the synthesis and single crystal X-ray structure of calcium-free crystals of Ba similar to 6.9Na similar to 0.2F12Br0.6Cl1.4 (space group P6(3)/m, a = 10.6024(10), c = 4.2034(4) angstrom), Ba similar to 6.9Na similar to 0.2F12Br1.4 Cl-0.6 (space group P6(3)/m, a = 10.6155(9), c = 4.2355(4) angstrom) and Ba similar to 6.9Na similar to 0.2Br1.32Cl0.68F12 (space group P6(3)/m, a = 10.6218(9), c = 4.2284(4) angstrom) are reported. These crystals systematically present additional electron density at the 0 0 0.25 position which is associated with the presence of small, but significant amounts of Na+ ions in the crystal.