Self-propagating high temperature synthesis of BaFe12O19, Mg0.5Zn0.5Fe2O4 and Li0.5Fe2.5O4; time resolved X-ray diffraction studies (TRXRD)

Abstract

It has come to our attention that the readout times of the X-ray scans we recorded on station 16.4 of Daresbury laboratory were of the order of 1.9 s, rather than milliseconds, as we had been led to believe. This fact does not alter the time for which each scan was recorded, which remains as stated in the paper (typically 100±250 ms), but it does necessitate other revisions. In Fig. 3, 4 and 5 the run numbers still stand, each having been collected for 0.25 s (Fig. 3 and 4) or 0.1 s (Fig. 5), however a time interval of ca. 1.9 s appears between successive scans. In effect, these were stroboscopically time resolved experiments. The readout time between scans also means (i) that the ultimate time resolution of the experiments was ca. 2 s, (ii) that the intermediates seen in the applied ®eld syntheses were quite long lived at over 10 s, and (iii) that the rates of cool down in the experiments were 5±10 times slower than those reported in the paper.

Influence of the Mole Ratio, Sintering Condition and Particle Size on the Magnetic Properties of BaFe12O19 Synthesized by Ceramic Method

“…The effect of mole ratio ( n ) on the magnetic properties are summarized in Table I, for samples with sintering temperature of 950°, 1000°, and 1050°C, at different times 1.5, 2.5, and 3 h. It was found that the best magnetic properties of samples are obtained for higher sintering temperature. This may be attributed to a decrease in hematite phase and an increase of barium ferrite phase with increasing sintering temperature 15 . The values of M s and M r are slightly different with different values of mole ratio ( n ) at a lower sintering temperature and time of 950°C/1.5 h. This may be attributed to the effect of intermediate phases, at lower sintering temperature and time as seen at 500°C (Fig.…”

“…Several methods have been used to prepare barium ferrite, including ceramic method, 11–13 self‐propagation high‐temperature synthesis, 14,15 spray pyrolysis technique, 16 sol–gel route, 17 hydrothermal technique, 18 coprecipitation, 19 and so forth. Among these methods, ceramic method, however, is not complex, highly productive, and cheaper than other techniques.…”

Tetragonal copper ferrite obtained by self-propagating combustion

“…are replaced by the wet chemistry methods: hydro/solvothermal synthesis, microemulsion, sol-gel and complexation tehnique [3][4][5][6][7][8][9]. A new and very promising method is the self-propagating combustion [10][11][12][13][14][15]. The combustion reaction depends on the type of the fuel, the fuel * Corresponding author.…”

Effect of electromagnetic field strength on Ni 0.35 Zn 0.65 Fe 2 O 4 as performed by combustion synthesis

“…It is not certain why the external field has magnetic effects [14]. One explanation is that the magnetic components are organized along the field lines.…”