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- W2071726190 abstract "Hydrothermally grown crystals of K8Nd3Si12O32(OH) have been examined by single crystal X-ray methods. The compound crystallizes in space group P1 and has lattice constants a=6.9660(6) Å, b=11.4550(10) Å, c=11.6670(10) Å, α=87.677(8)°, β=87.491(9)°, γ=79.083(8)°. There are 29 nonhydrogen atoms in the asymmetric unit. With one formula unit per unit cell, the calculated density is 2.929 Mg m−3. Refinement was carried out with 5667 independent and significant [I≥2.5σ(I)] structure factors to a residual, R(F), of 0.047 (Rw(F)=0.057) using anisotropic temperature factors for all atoms. The structure, closely related to that of K8Yb3Si12O32(OH), is based on unusually flat Si12O32 layers that are connected by Nd octahedra to form a three-dimensional framework. The silicate layer contains two types of six-membered rings, an eight-membered ring, and a meandering twelve-membered ring. It can be generated from a condensation of wollastonite-type chains and contains structural features found in the “ideal” silicate layers of α-K3NdSi6O15·2H2O and β-K3NdSi6O15. Potassium ions are located in the interstitial sites of the neodymia–silica framework, in channels that run between silicate layers; hydroxyl groups reside within channels that run through the layers. The conductivity in the [0 1 0] direction is given by σ=[1.4×103 K/Ωcm/T]×exp(−0.8 eV/kbT). Charge transport appears to occur by the motion of OH− ions." @default.
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- W2071726190 date "1999-12-01" @default.
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- W2071726190 title "The Structure and Conductivity of K8Nd3Si12O32(OH): A Layered Silicate with Paths for Possible Fast-Ion Condution" @default.
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- W2071726190 doi "https://doi.org/10.1006/jssc.1999.8466" @default.
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