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Synthesis and characterization of Al-and Y-Al-citrates as potential precursors for YAlO3

100%

Petrova N., Todorovsky D., Kovacheva D., Milanova M.

Open Chemistry

2006

vol. 4

issue 4

632-645

Al-and Y-Al-citric complexes have been synthesized in ethylene glycol medium at conditions close to the ones used in polymerized complex method and their composition and spectral characteristics have been studied. Proofs have been found for the formation in the bimetallic system of a mixed-metal Al-Y-complex. Doubly ionized and esterified ligands take place in the Al-complex. All of the ligands forming Y-Al-complex are mono-or doubly esterified. Deprotonation of the alcoholic group takes place in the formation of the mixed-metal complex. Both complexes contain adduct-bonded ethylene glycol. Heating of the bimetallic complex or of the polyester resin formed leads to not phase-homogeneous YAlO3-along with cubic YAlO3, its orthorhombic modification as well as Y4All2O9 are found by X-ray diffractometry.

Combined laser and magnetic field treatment of YFeO3-containing films grown by spray-pyrolysis

75%

Mihailov N., Vankov O., Petrova N., Kovacheva D.

Open Chemistry

2004

vol. 2

issue 1

188-195

Thin films (50–1200 nm) of YFeO3 were deposited on fused silica substrates by spray-pyrolysis using ethylene glycol solution of Y-Fe(III) citric complexes. The films were post deposition annealed at 750°C in static air for 2 h. Films obtained in this way were afterwards irradiated by a burst mode operated Nd-YAG laser (pulse energy 650 mJ, pulse duration 700 μs, energy density 110 mJ/cm2). The laser’s onset was synchronized with that of a magnetic field pulse of nearly square shape (magnetic induction 0.5 T, pulse duration 900 μs). The samples were placed normally to the direction of the magnetic field. The treatment does not affect the phase composition of the film but significantly increases the crystallite sizes of the phases presenting in the sample. The saturation magnetization of the films decreases as a result of the laser and magnetic field treatment and the coercive force increases by 50%.

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2 Open Chemistry

1 2006

1 2004

2 Kovacheva D.

2 Petrova N.

1 Mihailov N.

1 Milanova M.

1 Todorovsky D.

1 Vankov O.

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Synthesis and characterization of Al-and Y-Al-citrates as potential precursors for YAlO3

Combined laser and magnetic field treatment of YFeO3-containing films grown by spray-pyrolysis