99 research outputs found
Optical and EXAFS studies of NaNbO3 - Gd1/3NbO3 solid solutions
This study is supported by Russian Science Foundation (project 19-12-00205)
Magnetic properties and giant magnetoimpedance in amorphous and nanocrystalline microwires
We studied magnetic properties and GMI effect of Finemet-type FeCuNbSiB microwires. We observed that GMI effect and magnetic softness of microwires produced by the Taylor-Ulitovski technique, can be tailored by either controlling magnetoelastic anisotropy of as-prepared FeCuNbSiB microwires or controlling their structure by heat treatment or changing the fabrication conditions. GMI effect has been observed in as-prepared Fe-rich microwires with nanocrystalline structure.This work was supported by EU ERA-NET programme under project "SoMaMicSens" (MANUNET-2010-Basque-3), by Spanish MICINN under project MAT2010-18914, by the Basque Government under Saiotek-12 MEMFOMAG project (S-PE12UN139) and by federal target program "Scientific and scientific-pedagogical personnel of innovative Russia", state contract no 14.R18.21.0762. A. Zh. and V.Zh. wish to acknowledge support of the Basque Government under the Mobility Program (grants MV-2013-2-22 and MV-2013-2-23). Technical and human support provided by SGIker (UPV/EHU, MICINN, GV/EJ, ERDF and ESF) is gratefully acknowledged
Giant magnetoimpedance effect in nanocrystalline microwires
We studied GMI effect and magnetic properties of Finemet-type FeCuNbSiB microwires. We observed that GMI magnetic field and frequency dependences and magnetic softness of composite microwires produced by the Taylor-Ulitovski technique can be tailored either controlling magnetoelastic anisotropy of as-prepared FeCuNbSiB microwires or controlling their structure by heat treatment or changing the fabrication conditions. GMI effect has been observed in as-prepared Fe-rich microwires with nanocrystalline structure.This work was supported by EU ERA-NET programme under project "SoMaMicSens" (MANUN ET-2010-Basque-3), by EU under FP7 "EM-safety" project, by Spanish Ministry of Science and Innovation, MICINN under Project MAT2010-18914, by the Basque Government under Saiotek 11 MICMAGN project (S-PE11UN087) and by federal target program "Scientific and scientific-pedagogical personnel of innovative Russia", state contract No. 14.18.21.0783
Optimization of the Sample Preparation Procedure and Determination of the Content of REE and Ge in Low Carbonized Rocks by the ISP-MS Method Using a Triple Quadrupole
В работе представлены результаты исследований химического состава образцов
лигнита Касского месторождения методом масс-спектрометрии
с индуктивно связанной
плазмой (ИСП-МС) с акцентом на определение редкоземельных элементов и германия.
С учетом данных термогравиметрического анализа (ТГА) оптимизированы условия
пробоподготовки образца с применением микроволнового разложения и механохимической
активации, обеспечивающих практически полную минерализацию проб. Разработана методика
ИСП-МС‑определения германия и РЗЭ в лигните на приборе “Agillent 8800” с тройным
квадруполем и оценены ее метрологические характеристики. Показано, что лигниты Касского
месторождения характеризуются содержанием германия и РЗЭ в количествах, перспективных
для промышленного извлеченияThe paper presents the results of investigations of the chemical composition of lignite samples from the Kasskoye deposit by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) with an emphasis on the determination of rare earth elements (REE) and germanium. Taking into account the data of thermogravimetric analysis (TGA), the conditions for sample preparation were optimized using microwave decomposition and mechanochemical activation, which ensure almost complete mineralization of the samples. An ICP-MS method was developed for the determination of germanium and REE in lignite on an Agillent 8800 device with a triple quadrupole, and its metrological characteristics were evaluated. It is shown that the lignites of the Kass deposit are characterized by the content of germanium and REE in quantities that are promising for industrial extractio
The Structural Phase Transition of the Relaxor Ferroelectric 68%PbMg1/3Nb2/3O3-32%PbTiO3
Neutron scattering techniques have been used to study the relaxor
ferroelectric 0.68PbMg1/3Nb2/3O3-0.32PbTiO3 denoted in this paper as
0.68PMN-0.32PT. On cooling, these relaxor ferroelectrics have a long-range
ordered ferroelectric phase and the composition is close to that at which the
ferroelectric structure changes from rhombohedral to tetragonal. It was found
that above the Burns temperature of about 600K, the transverse optic mode and
the transverse acoustic mode are strongly coupled and a model was used to
describe this coupling that gave similar parameters to those obtained for the
coupling in PMN. Below the Burns temperature additional quasi-elastic
scattering was found which increased in intensity as the sample was cooled down
to the ferroelectric transition temperature but then decreased in intensity.
This behaviour is similar to that found in PMN. This scattering is associated
with the dynamic polar nano-regions that occur below the Burns temperature. In
addition to this scattering a strictly elastic resolution limited peak was
observed that was much weaker than the corresponding peak in pure PMN and which
decreased in intensity on cooling below the ferroelectric phase whereas for
PMN, which does not have a long-range ordered ferroelectric phase, the
intensity of this component increased monotonically as the sample was cooled.
The results of our study are compared with the recent measurements of Stock et
al. [PRB 73 064107] who studied 0.4PMN-0.6PT. The results are qualitatively
consistent with the random field model developed to describe the scattering
from PMN
Estates of the highest nobility in remote districts of St. Petersburg province in the 18th– early 20th century
The article presents the main results of an academic degree research work devoted to remote countryside estates of the aristocracy as special manorial properties, their identification, analysis, preservation, and adaptation for re-use, taking into account scientifically substantiated unique features of this type of objects. The contents of the main chapters are briefly summarized, and the principal conclusions are given
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