Structural data for apatite RE silicates La(9-x)Lnx(SiO4)6O(OH)

Structural data for solid solutions La(9-x)Lnx(SiO4)6O1.5 Contents Table S1. Rietveld refinement data for La9-xLnx(SiO4)6OOH. Table S2. Atomic coordinates, isotropic displacement parameters (Biso) and site occupancies (G) for La9-xGdx(SiO4)6OOH. Table S3. Cationic site occupancies (G) in La9-xGdx(SiO4)6OOH. Table S4. Selected interatomic distances in in La9-xLnx(SiO4)6OOH

Structural data for apatite RE silicates La(9-x)Lnx(SiO4)6O(OH)

Structural data for solid solutions La(9-x)Lnx(SiO4)6O1.5 Contents Table S1. Rietveld refinement data for La9-xLnx(SiO4)6OOH. Table S2. Atomic coordinates, isotropic displacement parameters (Biso) and site occupancies (G) for La9-xGdx(SiO4)6OOH. Table S3. Cationic site occupancies (G) in La9-xGdx(SiO4)6OOH. Table S4. Selected interatomic distances in in La9-xLnx(SiO4)6OOH

Data for Comparison between PZT Piezoceramics Consolidated from Nanopowder and Doped with Complex Oxide Additives

As demonstrated in [1], electrical properties of piezoelectric ceramics based on lead zirconate-titanate (PZT) can be improved by consolidation of previously synthesized nanocrystalline PZT powder into compact nanostructured ceramic bodies. In this dataset, to assess possible benefits of nanostructured PZT piezoceramics, their dielectric and piezoelectric properties (Table 1) are compared with those of a series of PZT materials sintered by traditional solid-state technology (Table 2). This series includes modified materials doped with ferroelectrically “soft” and “hard” complex oxide additives (AA´)(BB´B´´)O3 for various commercial applications. In the formula A = Sr, Ba, Li, La, Ce, Bi; B = Mn, Ge, Zn, Ni, Cd, Nb, W, Al, Fe. An example of “soft” additive is Bi(Ni1/3W1/3)O3, while ZnBi2/3Mn1/2O3 is an example of “hard” additive. The size of nanocrystallites was determined as the dimension of coherent scattering regions (CSR) from X-ray diffraction (Table 1). Nanosized crystallites separated with low-angle boundaries assemble into larger microsized grains divided between themselves by high-angle boundaries. The size of these grains dgr (Table 1) was determined by scanning electron microscopy. [1] V.V. Prisedskii, V.M. Pogibko, V.S. Polishchuk Production and Properties of Nanostructured Metal-Oxide Lead Zirconate–Titanate Piezoceramics //Powder Metallurgy and Metal Ceramics, 2014, V.52, No.9-10, P.505-513. https://doi.org/10.1007/s11106-014-9553-

Structural data for apatite RE silicates La(9-x)Lnx(SiO4)6O(OH)

Structural data for solid solutions La(9-x)Lnx(SiO4)6O1.5 Contents Table S1. Rietveld refinement data for La9-xLnx(SiO4)6OOH. Table S2. Atomic coordinates, isotropic displacement parameters (Biso) and site occupancies (G) for La9-xGdx(SiO4)6OOH. Table S3. Cationic site occupancies (G) in La9-xGdx(SiO4)6OOH. Table S4. Selected interatomic distances in in La9-xLnx(SiO4)6OOH

Isomorphous Substitutions of Rare Earth Elements for Calcium in Synthetic Hydroxyapatites

Polycrystalline hydroxyapatites Ca10−xREEx(PO4)6(OH)2−xOx were synthesized and studied by X-ray powder diffraction, infrared absorption, diffuse-reflectance spectroscopy, and thermogravimetry. The solubility limits xmax of rare earth elements (REE) in Ca hydroxyapatites decreases with an increasing REE atomic number from xmax = 2.00 for La, Pr, and Nd to xmax = 0.20 for Yb at 1100 °C. Refinements of X-ray diffraction patterns by the Rietveld method show that REE atoms substitute for Ca preferentially at the Ca(2) sites of the apatite structure. The substitution decreases the Ca(2)−O(4) atomic distances in the calcium coordination polyhedra and increases the Ca(2)−O(1,2,3) distances. This observation shows that interatomic distances depend not only on radii of the ions involved in the substitution but also on their charges