Alkaline earth scandates

In the CaOSrOSc2O3 and BaOSrOSc2O3 systems, complete series of mixed crystals were found for (Ca,Sr)Sc2O4 and (Sr,Ba)3Sc4O9 respectively. In the BaOCaOSc2O3 system a new ternary phas̀e with composition Bax(Ca2xSc2−2x)Sc6O12 was detected having an incommensurate structure which may be described with a basic hexagonal unit cell (a=9.7039 Å, c=3.1274 Å) and a second hexagonal cell having the same basic a-axis. The c-axis of the second cell is x-dependent: cx = 3.13/x Å, x varying from 0.782 to 0.736, corresponding to the region from BaCa2Sc8O15 with cx = 4.00 Å, to BaCa2Sc9O16.5 with cx = 4.25 Å.