New crystal structure and characterization of lanthanum tungstate "La6WO12" prepared by freeze-drying synthesis

Dalton Transactions : an International Journal of Inorganic Chemistry
Anna MagrasóPedro Núñez

Abstract

Lanthanum tungstates with a La/W atomic ratio between 6 and 4.8 have been synthesized as polycrystalline materials using the freeze-drying wet-chemical precursor method. Our results show that a single phase material is obtained when the La/W ratio is between 5.3 and 5.7 (T = 1500 degrees C). Outside this compositional range, segregation of either La(2)O(3) (La/W > or = 5.8) or La(6)W(2)O(15) (La/W < or = 5.2) are found. We have solved the crystal structure for the composition with a La/W nominal atomic ratio of 5.6 by combining powder X-ray and powder neutron diffraction techniques. This structure substantially differs from that previously reported for Ln(6)WO(12) (Ln = Y, Ho). The main differences between the two structure types are the crystal symmetry, the different coordination environment of the cations and the formula unit. The formula unit can be written as La(6.63)W(1.17)O(13.43) (Z = 4; calculated density = 6.395 g/cm(3)), well in accordance with the diffraction techniques, He-pycnometry and electron probe microanalysis. These materials can be described as a face centred cubic structure with space group F43m. Lattice parameters vary between 11.173 and 11.188 A, depending on composition. Dense ceramic materials are obta...Continue Reading

Citations

Jan 7, 2014·Inorganic Chemistry·Marie-Hélène ChambrierFrançois Goutenoire
Mar 14, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·M J Zayas-ReyE R Losilla
Jun 18, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Ye-Yu LiZhang-Zhen He
Oct 8, 2015·Chemical Communications : Chem Comm·Alessandro Mancini, Lorenzo Malavasi
Jan 19, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·J M Porras-VázquezEnrique R Losilla
Jan 29, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Anna Magrasó, Carlos Frontera
Nov 15, 2017·Chemical Communications : Chem Comm·Donglin HanTetsuya Uda
Oct 18, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Maths Karlsson
Dec 12, 2020·Journal of Applied Crystallography·Tobias ScherbJosé M Serra

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