Brown pigments based on perovskite structure of BiFeO3−δ

Dohnalová, Žaneta; Šulcová, Petra; Bělina, Petr; Vlček, M.; Gorodylova, Nataliia

doi:10.1007/s10973-017-6805-3

Cited by 10 publications

(7 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, an initial mixture corresponding to the theoretical formula Bi0.1Pr0.9FeO3 was prepared. The evaluation of the thermal behaviour of this mixture was supported not only by the results of the X-ray diffraction analysis, but also based on our earlier results of TG/DTA analysis of the raw materials reported in the our previous works [36][37][38][39]. The TG and DTA thermoanalytical curves provide the information about reactions between chemical ingredients and formation of compound.…”

Section: Resultssupporting

confidence: 60%

“…Deformation temperatures were determined at 1370 °C/1000 °C, 1356 °C/1100 °C for x = 0.2 and 1361 °C/1000 °C and 1325 °C/1100 °C for x = 0.3. Thermal stability of pure BiFeO3 found by Dohnalová was limited at Tdef=773 °C, and it was related to melting [39]. The higher thermal stability of orthoferrites in the present work compared to that in the literature may support the fact that Bi was introduced into PrFeO3 and a solid solution was formed.…”

Section: Resultssupporting

confidence: 40%

“…In the DTA curve, there is a slight decline indicating an endothermic effect at a temperature about 493 °C and it can be assigned to the phase transition of Fe2O3 from β into  -form [38,40,41]. Subsequent endothermic effect with minimum 644 °C corresponds not only to phase transformation of a monoclinic -Bi2O3 to a cubic modification δ-Bi2O3 [36,39,42], but also to another partial reduction of praseodymium oxide [37,38,43]. In the DTA curve, there is a weak indication of an endothermic effect at a temperature of 713 °C and it can be interpreted as the start of solid solution formation of BixPr1-xFeO3.…”

Section: Resultsmentioning

confidence: 97%

See 2 more Smart Citations

The effect of partial substitution of Bi on colour properties and thermal stability of BixPr1−xFeO3 pigments

Luxová

Šulcová

2019

J Therm Anal Calorim

Self Cite

View full text Add to dashboard Cite

The samples of BixPr1-xFeO3 (x=0-0.3) were prepared by conventional ceramic method. The main aim of this work was to focus on determination of influence of partial Bi substitution for Pr on chromaticity and thermal stability. The formation temperature of the orthoferrites was chosen according to the results of DTA/TG analysis. X-ray powder diffraction analysis showed that solid solutions with orthorhombic structure were created. Results of the work proved that Bi substitution for Pr in PrFeO3 has significantly impact on colour properties and thermal stability. Start of sintering of PrFeO3 was detected at 1086 °C and due to substitution of Bi 3+ decreased to 956 °C (for x = 0.3). Thermal stability of the samples with x = 0.2 and x = 0.3 was limited at 1371 °C, 1360 °C respectively. However, final colour was positively affected by the addition of Bi 3+ . Colour shades of powders shifted from yellowish brown to reddish brown with increasing amount of Bi ions. Very interesting colours of different deep yellowish and reddish brown shades were obtained after their application into organic binder. Mean particle size for all milled compounds prepared at 1000 °C was around 1 m and for samples calcined at 1100 °C ranged between 1 -1.6 m.

show abstract

Section: Resultssupporting

confidence: 60%

Section: Resultssupporting

confidence: 40%

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

The effect of partial substitution of Bi on colour properties and thermal stability of BixPr1−xFeO3 pigments

Luxová

Šulcová

2019

J Therm Anal Calorim

Self Cite

View full text Add to dashboard Cite

show abstract

“…The set of several mass-flow controllers (Aalborg) and a water vapour saturator was used for the mixing of reaction gas. The gas hour space velocity (GHSV) was ensured by using sample volume 0.06 cm 3 . The content of N2O, N2, and O2 at the reactor inlet and outlet was determined on an in-line connected a 6090 gas chromatograph (Hewlet Packard) with a Hysep column (packed column) removing water vapour.…”

Section: Catalytic Testsmentioning

confidence: 99%

“…and methods at low temperatures (precipitation, thermal degradation of precursors, sol-gel methods, etc.) [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Preparation of LaNiO3 perovskite by oxalate and carbonate precursor method for utilization as catalyst for high-temperature decomposition of N2O

Bělina

Sádovská

Krejčíková

et al. 2019

J Therm Anal Calorim

Self Cite

View full text Add to dashboard Cite

The mixed oxide LaNiO3 with perovskite structure was prepared by two relatively new and unconventional methods including preparation and thermal decomposition of mixed metal oxalate or carbonate precursors. The intermediates were prepared by reaction in a highly concentrated suspension (paste). The thermal decomposition conditions of these intermediates were described and the final calcination temperatures were determined, which was done using thermal analysis methods and X-ray diffraction. During the decomposition of mixed carbonates, one-phase LaNiO3 is produced directly, in case of decomposition of oxalates, a mixture of LaNiO3 and La2O3 is produced due to the formation of La2O2CO3 during the heating. Catalytic decomposition of nitrous oxide at high temperature (650 -930 °C) and high loading (GHSV = 350 000 h -1 ) has shown high LaNiO3 activity, even at lower temperatures. The results were compared with the same compound obtained by co-precipitation and by solid state reaction. Methods of preparation based on decomposition of oxalate and carbonate intermediates lead to the preparation of materials with appropriate composition, morphology, specific surface and high catalytic activity.

show abstract