Phase-Matching Properties of Niobium-Doped KTiOPO4(KTP).

Synthesis, Characterization and Optical Properties of Niobium Doped Silver-Lead-Borate Glasses

Niobium doped silver lead borate glasses with the chemical composition (29-x) PbO-yAg2O70B2O3-xNb2O5 (where x= 0.1 to 0.5mol%, y= 1 to 5 mol %) have prepared by conventional melt quenching method.SEM/XRD technique confines glassy nature of the prepared samples. IR and UV optical absorption technique have been used to obtain the information concerning network structure. From the absorption edge ...

Application of Secondary Ion Mass Spectrometry in Studies of Niobium Segregation in Niobium-Doped Titanium Dioxide

Secondary ion mass spectrometry (SIMS) is a powerful technique in the study of materials that demonstrate compositional changes as a function of depth from the surface. This is due to the high chemical sensitivity of SIMS (sensitive to ppb) and potential for high depth resolution. However, as a semi-quantitative technique, the application of SIMS to quantitative studies can be problematic witho...

Optical properties and frequency upconversion fluorescence in a Tm3+ -doped alkali niobium tellurite glass

Niobium-Doped Hydroxyapatite Bioceramics: Synthesis, Characterization and In Vitro Cytocompatibility

Doping calcium phosphates with ionic species can play an important role in biological responses promoting alkaline phosphatase activity, and, therefore inducing the generation of new bone. Thus, in this study, the synthesis of niobium-doped hydroxyapatite (Nb-HA) nanosize particles obtained by the precipitation process in aqueous media followed by thermal treatment is presented. The bioceramics...

Non-Linearity Extremum in Niobium Doped Potassium Tantalate

~We report non-linear dielectric measurements in the KTa03:Nb system (~Nb < 0.05). The non-linear susceptibility diverges at low temperatures and reaches maximum values in the intermediate range (0.0075 < ~Nb < 0.02). To account for this extremum non linearity, we propose a model of temperature dependent clusters which fits with a number of experimental reports. We also suggest that this model ...