Сложные допированные оксиды ниобия с ионной проводимостью

The novel compounds Li6MNb4O14 (M = Zn, Mg) have been synthesized and characterized in the Li2O-MO-Nb2O5 (M = Zn, Mg) system. The synthesized phases were investigated by XRD, DTA and the chemical analysis. Specific conductivity and energy of activation of each compounds and the sample that doping by titanium oxide has been found. Comparison of absorption IR-spectra of investigated compounds and of samples Li6ZnNb4O14 having isotope on lithium and zinc has been compared.В системах Li2O-MO-Nb2O5 (M = Zn, Mg) синтезированы и охарактеризованы новые соединения Li6MNb4O14 (M = Zn, Mg). Найдены удельная проводимость и энергия активации каждого соединения, а также образца Li6ZnNb4O14, легированного оксидом титана. Произведено сравнение спектров ИК поглощения исследуемых соединений и изотопозамещенных по литию и цинку образцов Li6ZnNb4O14

Sectional Singularities and Geometry of Families of Planar Quadratic Forms

https://stars.library.ucf.edu/cfm-ch-register-vol24/1501/thumbnail.jp

On stability of generic subriemannian caustic in the three-space

The singularities of exponential mappings in subriemannian geometry are interesting objects, that are already non-trivial at the local level, contrarily to their Riemannian analogs. The simplest case is the three-dimensional contact case