TY - JOUR
T1 - Structure of Na3NdSi6O15.2H2O - A Layered Silicate with Paths for Possible Fast-Ion Conduction
AU - Haile, S. M.
AU - Wuensch, B. J.
AU - Laudise, R. A.
AU - Maier, J.
PY - 1997/2/1
Y1 - 1997/2/1
N2 - Hydrothermal investigations of the high silica region of the Na2O-Nd2O3-SiO2 system, carried out in the search for new fast-ion conductors (FIC's), yielded the compound Na3NdSi6O15.2H2O (sodium neodymium silicate). Single-crystal X-ray methods provided lattice constants of a = 7.385 (2), b = 30.831 (7) and c = 7.1168 (13) Å, space group Cmm2, and 22 atoms in the asymmetric unit. With four formula units per unit cell, the calculated density is 2.68 g cm-3. Refinement was carried out with 1113 independent structure factors to a weighted residual wR(F) of 2.63% [8.09% for wR(F2)] using anisotropic temperature factors for all atoms. The structure, based on corrugated Si6O15 layers containing four-, five-, six- and eight-membered rings, is related to that of a model previously reported for a compound assigned the composition NaNdSi6O13(OH)2.nH2O. Our structure differs in the placement of sodium ions and water molecules, and contains no hydroxyl groups. We believe that both studies examined the same phase.
AB - Hydrothermal investigations of the high silica region of the Na2O-Nd2O3-SiO2 system, carried out in the search for new fast-ion conductors (FIC's), yielded the compound Na3NdSi6O15.2H2O (sodium neodymium silicate). Single-crystal X-ray methods provided lattice constants of a = 7.385 (2), b = 30.831 (7) and c = 7.1168 (13) Å, space group Cmm2, and 22 atoms in the asymmetric unit. With four formula units per unit cell, the calculated density is 2.68 g cm-3. Refinement was carried out with 1113 independent structure factors to a weighted residual wR(F) of 2.63% [8.09% for wR(F2)] using anisotropic temperature factors for all atoms. The structure, based on corrugated Si6O15 layers containing four-, five-, six- and eight-membered rings, is related to that of a model previously reported for a compound assigned the composition NaNdSi6O13(OH)2.nH2O. Our structure differs in the placement of sodium ions and water molecules, and contains no hydroxyl groups. We believe that both studies examined the same phase.
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U2 - 10.1107/S0108768196009950
DO - 10.1107/S0108768196009950
M3 - Article
AN - SCOPUS:0039952690
SN - 0108-7681
VL - 53
SP - 7
EP - 17
JO - Acta Crystallographica Section B: Structural Science
JF - Acta Crystallographica Section B: Structural Science
IS - 1
ER -