Double Perovskite Sr₂FeMoO₆ Films Prepared by Electrophoretic Deposition

Abstract

The present work reports on the new approach to create metal-supported Sr2FeMoO6 (SFMO)-based electrodes that have high potential to be applied in solid oxide fuel cells. The SFMO films were formed on stainless steel substrates by electrophoretic deposition (EPD) method. Ethyl alcohol with phosphate ester as a dispersant and isopropyl alcohol with I2-acetone mixture as a charge additive were considered as an effective medium for EPD of SFMO particles. The synthesis of SFMO powder as well as suspension preparation and deposition kinetics were systematically studied. The effect of applied voltage on the thickness and morphology of SFMO films was established. The microstructure of the deposits was examined by electron microscopy. The thickness, morphology and porosity of the SFMO layers can be fine-tuned by varying solvent, charging additives, deposition time, and applied voltage. According to X-ray photoelectron spectroscopy analysis, it was found that Fe(3+)-Mo(5+) and Fe(2+)-Mo(6+) pairs coexist, whereas the valent balance shifts toward an Fe(2+)-Mo(6+) configuration.

Small‐Angle Neutron Scattering and Magnetically Heterogeneous State in Sr2FeMoO6–δ

“…There are numerous potential applications of the Sr 2 FeMoO 6–δ double perovskite (SFMO), such as energy‐independent magnetic random‐access memory (MRAM), magnetic read heads for hard‐disk drives, sensitive magnetic‐field sensors, electrodes for solid fuel elements, and others. For these applications, structurally perfect SFMO samples with high values of the Curie temperature, saturation magnetization ( М s ), spin polarization degree of conduction electrons ( P s ) are needed .…”

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr2FeMoO6−x nanopowders formed by the citrate–gel method

“…This is due to several factors: the phase purity within the sample, cation and anion vacancies, sample microstructure, chemical composition and thickness of the grain boundaries [10–13]. Sol–gel technology is a relatively new, but very promising method to synthesize nanoscale, double perovskite materials at relatively low temperatures and in a shorter time [3–4 14]. However, despite numerous articles devoted to this subject [3,7–8 15–16], the optimization of a sol–gel-based synthesis procedure to obtain nanoscale single-phase Sr 2 FeMoO 6−x with a maximum degree of superstructural ordering, still remains a challenge.…”

Phase Transformations and Magnetic State in the Nanoscale Metal-Oxide Sr$_{2}$FeMoO$_{6-\delta}$ Compounds

“…РФЭС-спектры остовных уровней Fe2p (a) и Mo3d (б) порошков SFMO-4, 6 и 9. ), возможны только отрицательные обменные взаимодей-ствия с формированием антипараллельного упорядочения магнит-ных моментов и формирование антиферромагнитных кластеров [6,12,23].…”

“…В литературе имеются сведения о получении Sr 2 FeMoO 6 меха-нохимическим методом с использованием высокотемпературного синтеза в восстановительной газовой среде, при котором средний размер зёрен порядка микронных размеров [7,[12][13][14][15][16][17]. Однако син-тезировать ферромолибдат стронция с заданной анионной и кати-онной дефектностью весьма проблематично [18].…”

“…Повышение степени сверхструктурного упорядочения катионов Fe и Mo увеличивает плотность свободных носителей заряда на уровне Ферми D(E F ) и повышает ферромагнитные и металлические свойства двойного перовскита [5,12]. Это обусловлено тем, что при нахождении катионов Fe 3 и Mo 5 в высокоспиновом состоянии с электронными конфигурациями (3d…”