Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal Stress
The degradation behavior of PrBaCo<sub>2</sub><sub>−<i>x</i></sub>Cu<i><sub>x</sub></i>O<sub>5+</sub><sub>δ</sub> (<i>x</i> = 0, 0.2, 0.5) under thermal stress was investigated in terms of phase formation...
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MDPI AG
2021-12-01
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| Online Access: | https://www.mdpi.com/2076-3417/12/1/151 |
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| author | Kanghee Jo Jooyeon Ha Taeheun Lim Heesoo Lee |
| author_facet | Kanghee Jo Jooyeon Ha Taeheun Lim Heesoo Lee |
| author_sort | Kanghee Jo |
| collection | DOAJ |
| description | The degradation behavior of PrBaCo<sub>2</sub><sub>−<i>x</i></sub>Cu<i><sub>x</sub></i>O<sub>5+</sub><sub>δ</sub> (<i>x</i> = 0, 0.2, 0.5) under thermal stress was investigated in terms of phase formation and polarization resistance. The tetragonal phase was indexed in all compositions of PBCCu<i>x</i>, and the secondary phase, BaO, was identified after thermal degradation in the crystal structure analysis. BaO formation is induced by the nature of perovskite to terminate the surface with AO layer. For pristine specimens, the oxygen vacancy peak ratio was increased from 57% to 60% according to the decrease in the average oxidation number of the B-site ion with Cu doping. After thermal deterioration, the oxidation number of B-site ions was increased, and the M = O bonding peak increased due to the decrease in oxygen vacancies and BaO formation according to the thermal stress. In all compositions, the electrical conductivity decreased from 1000 S/cm to 17 S/cm, and the polarization resistance increased approximately 200 times. These results are considered to be related to the increase in the oxidation number of B-site ions along with the formation of secondary phases. |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:50:20Z |
| publishDate | 2021-12-01 |
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| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-74b2d8bf690242268205af8f6496e0992023-11-23T11:08:30ZengMDPI AGApplied Sciences2076-34172021-12-0112115110.3390/app12010151Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal StressKanghee Jo0Jooyeon Ha1Taeheun Lim2Heesoo Lee3School of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaSchool of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaSchool of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaSchool of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaThe degradation behavior of PrBaCo<sub>2</sub><sub>−<i>x</i></sub>Cu<i><sub>x</sub></i>O<sub>5+</sub><sub>δ</sub> (<i>x</i> = 0, 0.2, 0.5) under thermal stress was investigated in terms of phase formation and polarization resistance. The tetragonal phase was indexed in all compositions of PBCCu<i>x</i>, and the secondary phase, BaO, was identified after thermal degradation in the crystal structure analysis. BaO formation is induced by the nature of perovskite to terminate the surface with AO layer. For pristine specimens, the oxygen vacancy peak ratio was increased from 57% to 60% according to the decrease in the average oxidation number of the B-site ion with Cu doping. After thermal deterioration, the oxidation number of B-site ions was increased, and the M = O bonding peak increased due to the decrease in oxygen vacancies and BaO formation according to the thermal stress. In all compositions, the electrical conductivity decreased from 1000 S/cm to 17 S/cm, and the polarization resistance increased approximately 200 times. These results are considered to be related to the increase in the oxidation number of B-site ions along with the formation of secondary phases.https://www.mdpi.com/2076-3417/12/1/151layered perovskitethermal stressB-site oxidation stateoxygen speciesconductivities |
| spellingShingle | Kanghee Jo Jooyeon Ha Taeheun Lim Heesoo Lee Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal Stress Applied Sciences layered perovskite thermal stress B-site oxidation state oxygen species conductivities |
| title | Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal Stress |
| title_full | Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal Stress |
| title_fullStr | Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal Stress |
| title_full_unstemmed | Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal Stress |
| title_short | Insulative Phase Formation and Polarization Resistance of PrBaCo<sub>2−<i>x</i></sub>Cu<sub><i>x</i></sub>O<sub>5+δ</sub> under Thermal Stress |
| title_sort | insulative phase formation and polarization resistance of prbaco sub 2 i x i sub cu sub i x i sub o sub 5 δ sub under thermal stress |
| topic | layered perovskite thermal stress B-site oxidation state oxygen species conductivities |
| url | https://www.mdpi.com/2076-3417/12/1/151 |
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