The influence of anion doping on the structure and transport properties of proton conductors Ba3In2ZrO8 и Ba4In2Zr2O11

В рамках данной работы проведен синтез перовскитоподобных оксифторидов на основе Ba3In2ZrO8 и Ba4In2Zr2O11, исследованы их структура (методами рентгеновской дифракции и инфракрасной спектроскопии), процессы гидратации, термические и электрические свойства. Установлено, что исследуемые фазы способны к диссоциативному поглощению паров воды из газовой фазы и протонному переносу. Проведены исследования общей проводимости при варьировании температуры в сухой (pH2O=4.5 10−4 атм) и влажной (pH2O=1.42 10−2 атм) атмосферах. Установлено, что присутствие малых концентраций фтора увеличивает кислородно-ионную и протонную проводимость.The novel perovskite-type oxyfluorides based on Ba3In2ZrO8 and Ba4In2Zr2O11 were synthesized and their structure (X-ray, infrared spectroscopy), thermal properties, hydration behaviour and electrical properties have been investigated. These phases are capable of dissociative dissolution of water and can exhibit proton transport. Electrical conductivity were measured with varying T in dry (pH2O=4.5 10−4 atm) and wet (pH2O=1.42 10−2 atm) atmospheres. It was established that small F−-concentrations can improve the oxide-ion and the proton conductivities.Программа развития УрФУ на 2013 год (п.2.1.1.1

Effect of anion doping on mobility of ionic charge carriers in solid solutions based on Ba2In2O5

In the work, mobilities of oxygen and protons are determined for F --substituted solid solutions based on brownmillerite Ba 2In2O5 and their concentration dependences are analyzed. It is found that small additives of the more mobile anion (F - ions) promote an increase in oxygen mobility as a result of additional effects of repulsion of ions of different nature in the anion sublattice. Mobility of oxygen at high fluoride concentrations decreases due to the overlapping of migration paths of diffusion, as both anions, fluoride ions and oxygen ions, move via oxygen vacancies. Concentration dependences of mobility of proton carriers have a similar character, which is related to the effect of the oxygen sublattice. The anion doping method used in the work can be recommended as the general method for improvement of the transport characteristics of oxygen-ionic and protonic conductors with a perovskite-like structure. © 2013 Pleiades Publishing, Ltd

On the spatial structure of the Perseids meteor stream

The analysis of radar observations of the Perseid meteor stream conducted in an ionospherical laboratory in the period from 1964 to 1981 is presented. The Perseids meteor rates were determined by the fluctuation method. Analysis of their hourly distributions showed that the stream maximum position is different for different years, i.e., the stream nodal position is constantly changing. The results of the analysis are presented and discussed

Electric properties of oxyfluorides Ba2In2O 5-0.5x F x with brownmillerite structure

Synthesis of fluoro-substituted substances based on brownmillerite Ba 2In2O5 is carried out. The width of the homogeneity region of the Ba2In2O5-0.5x F x (0 < x ≤ 0.25) solid solution was established using X-ray analysis. Measurement of temperature dependences of conductivity in atmospheres with different partial pressure of water vapor (pH2O = 3.3 and 2 Ч 103 Pa) showed an increase in conductivity at T ≤ 550 C in a humid atmosphere, which is due to appearance of proton transport. The dependence of conductivity on partial oxygen pressure (pO2 = 0.21 Ч 105 to 10-15 Pa) is studied in the temperature range of 500-1000 C; ion transport numbers are calculated. The method of polarization measurements was used to determine transport numbers of fluoride. Total conductivity is divided into ion (proton, oxygen, and fluoride ion) and electron components. Analysis of concentration dependences of conductivities showed that low concentrations of fluoride allow increasing both the total and partial conductivities (oxygen-ion and proton) and, besides, allow shifting the "order-disorder" phase transition by 100 C to the low temperature range. © 2013 Pleiades Publishing, Ltd

IDENTITY AS A МОDUS OF HUMAN BEING

В статье анализируется проблема взаимообусловленности идентичности и экзистенции в контексте основополагающих концептов философского учения М. Хайдеггера – здесь-бытия (Dasein) и бытия-в-мире, со-бытия и со-здесь-бытия, бытия «я» и «кто», темы просёлка и возвращения.В статті аналізується проблема взаємообумовленості ідентичності та екзистенції в контексті головних концептів філософського вчення М. Хайдеггера – тут-буття (Dasein) та буття-у-світі, спів-буття та спів-тут-буття, буття «я» та «хто», теми узбіччя й повернення.The problem of mutual conditionality identity and existence in the content of basic concepts of M. Heidegger philosophy study – here-being (Dasein), being-in-the world, co-being and co-herebeing, «I», being and «who» being, is this article

The population structure of the lichen Lobaria pulmonaria in the middle boreal forests depends on the time-since-disturbance

The population structure of the lichen Lobaria pulmonaria (L.) Hoffm. was analyzed in the Vodlozersky National Park (Karelia, Russia), for middle boreal forest stands having a time-since-disturbance spanning 80 to 450 years. To estimate the age of the last disturbance, a method of evaluation for the tree population structure was applied. The forest stand communities belonged to a successional series: middle-aged aspen – mixed aspen-spruce – pre-climax spruce – climax (old-growth) spruce forest. All thalli (1055) of L. pulmonaria from all substrate units (165, separately standing or lying trees and shrubs) were described within 7 sample plots of 1 ha. For each thallus, the area (cm2) and the functional-age group were determined. The number of Lobaria thalli per ha, number of substrate units, number of substrate types (living, standing dead and lying dead trees of different species) colonized by L. pulmonaria, as well as number of substrate types on which the lichen had completed its life cycle increased with time-since-disturbance.