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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ivanov, I. L. Malyshkin, D. A. Tsvetkov, D. S. Zuev, A. Yu |
| Description | Author Affiliation: Tsvetkov DS ( Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Ekaterinburg, 620000, Russia. dmitry.tsvetkov@urfu.ru.) |
| Abstract | $PrBaCo_{2−x}Fe_{x}O_{6−δ}$ (x = 0–0.6) double perovskites were shown to have a tetragonal P4/mmm structure in air over the complete temperature range investigated despite the oxygen content reaching a threshold value of 5.5 at temperatures from 850 °C for x = 0 up to 1078 °C for x = 0.6. However the P4/mmm→Pmmm structure transition was found to occur in $PrBaCo_{2}O_{6−δ}$ under reducing conditions at temperatures from 500 °C at $pO_{2}$ = $10^{−3}$ atm down to 350 °C at $pO_{2}$ = $10^{−4}$ atm. The lattice chemical expansion along the a-axis and contraction along the c-axis, with decreasing oxygen content, 6 − δ, were found to completely compensate each other in the double perovskites and, therefore, their volume chemical expansion became negligible. As a result the cell volume linearly increases with temperature contrary to simple cubic perovskites. |
| ISSN | 14779226 |
| Issue Number | 31 |
| Volume Number | 43 |
| e-ISSN | 13645447 |
| Journal | Dalton Trans. |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2014-08-21 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Subscribed |
| Subject Keyword | Calcium Compounds Chemistry Oxides Oxygen Titanium Calorimetry, Differential Scanning Crystallization Molecular Structure Temperature X-Ray Diffraction Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Inorganic Chemistry |
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