Influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites
In this work neodymium manganites, Nd1-xAxMnO3±δ, doped with Ba or Sr (where x = 0.15 and 0.25) were obtained by ceramic technology at 1250 °C. In order to obtain materials with stable thermal and electrical properties, their structure and physicochemical properties were studied depending on the dop...
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University of Novi Sad
2020-09-01
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| Series: | Processing and Application of Ceramics |
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| Online Access: | http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2049%2004.pdf |
| _version_ | 1824023883106222080 |
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| author | Larisa Vedmid' Olga Fedorova Valentina Balakireva Vladimir Balakirev |
| author_facet | Larisa Vedmid' Olga Fedorova Valentina Balakireva Vladimir Balakirev |
| author_sort | Larisa Vedmid' |
| collection | DOAJ |
| description | In this work neodymium manganites, Nd1-xAxMnO3±δ, doped with Ba or Sr (where x = 0.15 and 0.25) were obtained by ceramic technology at 1250 °C. In order to obtain materials with stable thermal and electrical properties, their structure and physicochemical properties were studied depending on the dopant type and its concentration. It was established that the manganites doped with strontium (for x = 0.15 and 0.25) and barium (for x = 0.15) have the Jahn-Teller distortion of the structure, but it was not observed for the sample Nd0.75A0.25MnO3±δ. The sequence of phase transformations was studied under conditions of reduced oxygen pressure in gaseous phase using thermal analysis in combination with XRD. The influence of temperature and oxygen pressure on the stability limit of the manganites was investigated. The studied manganites remain stable in the range of partial oxygen pressures PO2 from 0.21 to 10−14 atm at 800 °C. An increasing in the dopant concentration leads to the increase of manganite electrical conductivity without decreasing the thermal stability limit. |
| first_indexed | 2024-12-19T09:40:50Z |
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| id | doaj.art-f0f3dbd317cf49579e9bd113b6e8814e |
| institution | Directory Open Access Journal |
| issn | 1820-6131 2406-1034 |
| language | English |
| last_indexed | 2024-12-19T09:40:50Z |
| publishDate | 2020-09-01 |
| publisher | University of Novi Sad |
| record_format | Article |
| series | Processing and Application of Ceramics |
| spelling | doaj.art-f0f3dbd317cf49579e9bd113b6e8814e2022-12-21T20:27:21ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312406-10342020-09-0114320320910.2298/PAC2003203VInfluence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganitesLarisa Vedmid'0Olga Fedorova1Valentina Balakireva2Vladimir Balakirev3Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, Postal Code 620016, Amundsen St., 101, Yekaterinburg, Russia; Ural Federal University, Postal Code 620002, Mira St., 19, Yekaterinburg, RussiaInstitute of Metallurgy, Ural Branch, Russian Academy of Sciences, Postal Code 620016, Amundsen St., 101, Yekaterinburg, RussiaInstitute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, Postal Code 620137, Academicheskaya St., 20, Yekaterinburg, RussiaInstitute of Metallurgy, Ural Branch, Russian Academy of Sciences, Postal Code 620016, Amundsen St., 101, Yekaterinburg, RussiaIn this work neodymium manganites, Nd1-xAxMnO3±δ, doped with Ba or Sr (where x = 0.15 and 0.25) were obtained by ceramic technology at 1250 °C. In order to obtain materials with stable thermal and electrical properties, their structure and physicochemical properties were studied depending on the dopant type and its concentration. It was established that the manganites doped with strontium (for x = 0.15 and 0.25) and barium (for x = 0.15) have the Jahn-Teller distortion of the structure, but it was not observed for the sample Nd0.75A0.25MnO3±δ. The sequence of phase transformations was studied under conditions of reduced oxygen pressure in gaseous phase using thermal analysis in combination with XRD. The influence of temperature and oxygen pressure on the stability limit of the manganites was investigated. The studied manganites remain stable in the range of partial oxygen pressures PO2 from 0.21 to 10−14 atm at 800 °C. An increasing in the dopant concentration leads to the increase of manganite electrical conductivity without decreasing the thermal stability limit.http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2049%2004.pdfmanganite perovskitessofcstructural characterizationsuperconductivitythermal properties |
| spellingShingle | Larisa Vedmid' Olga Fedorova Valentina Balakireva Vladimir Balakirev Influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites Processing and Application of Ceramics manganite perovskites sofc structural characterization superconductivity thermal properties |
| title | Influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites |
| title_full | Influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites |
| title_fullStr | Influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites |
| title_full_unstemmed | Influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites |
| title_short | Influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites |
| title_sort | influence of temperature and oxygen pressure on the stability of barium or strontium doped neodymium manganites |
| topic | manganite perovskites sofc structural characterization superconductivity thermal properties |
| url | http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2049%2004.pdf |
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