Crystal structure and XANES study of Sn-substituted YBa2Cu3O7-y powder prepared by solid-state synthesis method

The influence of BaSnO3 and BaZrO3 nanoinclusions on the critical current and local structure of HTS coated conductors

“…The concentration of nanoinclusions of both types was 5 mol%. [22,26,27]) indicate a similar type of nanoinclusions of tin compounds at concentrations exceeding 0.2 mol%. In order to specify the structure of tin nanoinclusions in the YBCO superconducting matrix, XANES and EXAFS spectra collected at the K-Sn absorption edge were analyzed.…”

“…Studies on the introduction of nanoadditives as pinning centers were carried out for a wide range of methods for the synthesis of HTSC films: pulsed laser deposition (PLDpulse laser deposition) [15,16], deposition from liquid organometallic precursors (MOD-metalorganic deposition) [17,18], gaseous deposition using organometallic compounds (MOCVD-metalorganic chemical vapor deposition) [11,12,[19][20][21][22]. Along with monoadditives, the combinations of point and columnar defects were also considered [23].…”

“…To gain insight into the nature of the influence of pinning nanoinclusions on the critical characteristics of HTSC, it is necessary to study their impact on the structure of a superconductor. There are several publications on the microstructure of REBCO composites with BaZrO 3 [21,26,27,[30][31][32] and BaSnO 3 [22,26,27,33]. Transmission electron microscopy [30] and x-ray diffraction (XRD) [21,31,32] are actively used for this purpose.…”

“…Thus, the study of HTSC tapes by x-ray absorption spectroscopy (extended x-ray absorption fine structure (EXAFS) and x-ray absorption near edge structure (XANES)) gave additional evidence for the existence of zirconium nanoinclusions in the form of BaZrO 3 [19]. Prayoonphokkharat et al [22] found the secondary phase BaSnO 3 in tin-doped YBCO and proved using XANES spectroscopy that tin does not substitute for copper. Oh et al [33] reported the EXAFS study of GdBa 2 Cu 3 O 7−δ films with BaSnO 3 nanoinclusions fabricated using PLD.…”

Увеличение Критического Тока Сверхпроводящих Композитов При Имплантации Ионов Железа

“…В частности, в работах [12,13] было показано, что наночастицы BaZrO 3 имеют высокие перспективы как кандидаты в инертные центры пиннинга. Исследования по созданию искусственных центров пиннинга на основе нанодобавок проводились для ВТСП-пленок, полученных различными методами: импульсного лазерного напыления [14,15,16], металлоорганического осаждения жидких прекурсоров [17,18], осаждения металлорганических соединений из газообразной фазы [10,11,[19][20][21][22][23]. Наряду с монодобавками, рассматривался способ создания структур с комбинацией точечных и колончатых дефектов [24].…”