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Crystals of Na2ScSiO4(OH) and Na2YbSiO4(OH) were synthesized at low temperatures using a sodium hydroxide based hydroflux, while crystals of NaLaSiO4 and NaYbSiO4 were grown at high temperatures using a sodium fluoride/sodium chloride eutectic flux. Both structure types were crystallized under reaction conditions that, when used for medium sized rare earths (RE = Pr, Nd, Sm – Tm) yield the Na5RE4X[SiO...
Single crystal X-ray and synchrotron X-ray powder diffraction have been used to probe the structure of Ba 3 NaIr 2 O 9 from 300K down to 20K. Ba 3 NaIr 2 O 9 is found to undergo a structural transition from hexagonal symmetry, P6 3 /mmc, at ambient temperature to monoclinic symmetry, C2/c, at low temperature. The evolution of the unit cell volume...
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