“…The results of the XRD phase analysis are summarized in Table . Except for Sb 2 O 4 and FeSbO 4 , no other new compounds are observed such as Fe 3 O 4 , Sb 2 O 5 , Sb 6 O 13 , Fe 2 Sb 2 O 6 , Fe 2 Sb 2 O 7 , , FeSb 2 O 4 , and so on. The situation will be the same even though the original ratio of Sb 2 O 3 /Fe 2 O 3 is changed. , The involved reactions are 1 XRD patterns of Fe2Sb samples: □, senarmontite Sb 2 O 3 ; ▪ ,valentinite Sb 2 O 3 ; ▵, Sb 2 O 4 ; ○, Fe 2 O 3 ; *, FeSbO 4 .…”
Section: Resultsmentioning
confidence: 96%
“…XRD patterns of all the samples are shown in Figure 1. Only two phases can be observed in Fe2Sb-100#: hematite 32 and so on. The situation will be the same even though the original ratio of Sb 2 O 3 /Fe 2 O 3 is changed.…”
This paper studies the antimony spreading and segregation that occurred along with the oxidation and solid-state reactions in the Fe2O3-Sb2O3 system. XRD, SEM, TG-DSC and particularly XPS were employed for characterizations. Sb2O4 and FeSbO4 are the only new phases detected. The formation of FeSbO4 is a more exothermic but slower reaction than oxidation of Sb2O3. A mechanical grinding of Sb2O3 and Fe2O3 leads to a significant dispersion of Sb2O3 possibly because of its low hardness. Dispersion of reference Sb2O4 in this way is negligible. During the heating of a mixture of Sb2O3 and Fe2O3 with an atomic ratio of Sb/Fe = 0.5 at 200-1000 degrees C in ambient air, the thermal spreading of Sb2O3 onto Fe2O3 increases with increasing temperature until Sb2O3 is oxidized into Sb2O4. The surface atomic ratio of Sb/Fe measured by XPS, R(Sb/Fe), reaches a maximum around 400 degrees C. The complete oxidation of Sb2O3 leads to a decrease in R(Sb/Fe) because of poorer dispersibility of Sb2O4. The formation of FeSbO4 starting at ca. 800 degrees C causes a further decrease in R(Sb/Fe), but the R(Sb/Fe) is still 3.2 times the nominal bulk Sb/Fe ratio when the Sb2O4 is completely transformed into FeSbO4.
“…The results of the XRD phase analysis are summarized in Table . Except for Sb 2 O 4 and FeSbO 4 , no other new compounds are observed such as Fe 3 O 4 , Sb 2 O 5 , Sb 6 O 13 , Fe 2 Sb 2 O 6 , Fe 2 Sb 2 O 7 , , FeSb 2 O 4 , and so on. The situation will be the same even though the original ratio of Sb 2 O 3 /Fe 2 O 3 is changed. , The involved reactions are 1 XRD patterns of Fe2Sb samples: □, senarmontite Sb 2 O 3 ; ▪ ,valentinite Sb 2 O 3 ; ▵, Sb 2 O 4 ; ○, Fe 2 O 3 ; *, FeSbO 4 .…”
Section: Resultsmentioning
confidence: 96%
“…XRD patterns of all the samples are shown in Figure 1. Only two phases can be observed in Fe2Sb-100#: hematite 32 and so on. The situation will be the same even though the original ratio of Sb 2 O 3 /Fe 2 O 3 is changed.…”
This paper studies the antimony spreading and segregation that occurred along with the oxidation and solid-state reactions in the Fe2O3-Sb2O3 system. XRD, SEM, TG-DSC and particularly XPS were employed for characterizations. Sb2O4 and FeSbO4 are the only new phases detected. The formation of FeSbO4 is a more exothermic but slower reaction than oxidation of Sb2O3. A mechanical grinding of Sb2O3 and Fe2O3 leads to a significant dispersion of Sb2O3 possibly because of its low hardness. Dispersion of reference Sb2O4 in this way is negligible. During the heating of a mixture of Sb2O3 and Fe2O3 with an atomic ratio of Sb/Fe = 0.5 at 200-1000 degrees C in ambient air, the thermal spreading of Sb2O3 onto Fe2O3 increases with increasing temperature until Sb2O3 is oxidized into Sb2O4. The surface atomic ratio of Sb/Fe measured by XPS, R(Sb/Fe), reaches a maximum around 400 degrees C. The complete oxidation of Sb2O3 leads to a decrease in R(Sb/Fe) because of poorer dispersibility of Sb2O4. The formation of FeSbO4 starting at ca. 800 degrees C causes a further decrease in R(Sb/Fe), but the R(Sb/Fe) is still 3.2 times the nominal bulk Sb/Fe ratio when the Sb2O4 is completely transformed into FeSbO4.
“…Bussiere and coworkers used the Mössbauer effect to study the state of tin in supported Pt − Sn [28] and Ir − Sn [29] reforming catalysts and of tin and antimony in mixed Sb − Sn oxides for the selective oxidation of propane [30]. Bussiere and coworkers used the Mössbauer effect to study the state of tin in supported Pt − Sn [28] and Ir − Sn [29] reforming catalysts and of tin and antimony in mixed Sb − Sn oxides for the selective oxidation of propane [30].…”
The sections in this article are
Introduction
M
össbauer Spectroscopy
Time‐Differential Perturbed Angular Correlations (
TDPAC
)
Conclusions and Outlook
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