Sintering and Electrical Conductivity of Medium- and High-Entropy Calcium-Doped Four B-Site Cation Perovskite Materials
La<sub>1−x</sub>Ca<sub>x</sub>(Co<sub>0.25</sub>Cr<sub>0.25</sub>Fe<sub>0.25</sub>Ni<sub>0.25</sub>)O<sub>3−δ</sub> perovskite powders were prepared via a sol-gel process. The A-site was doped with calcium, while fou...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
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| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/15/6/524 |
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| Summary: | La<sub>1−x</sub>Ca<sub>x</sub>(Co<sub>0.25</sub>Cr<sub>0.25</sub>Fe<sub>0.25</sub>Ni<sub>0.25</sub>)O<sub>3−δ</sub> perovskite powders were prepared via a sol-gel process. The A-site was doped with calcium, while four elements—cobalt, chromium, iron, and nickel—in equiatomic amounts made up the B-site. The configurational entropy was calculated to increase with the addition of calcium from medium to high entropy. The synthesized powders were heated to 1400 °C in air for 2 h to sinter them. The effect of doping on the resulting sintered materials was observed via density measurements and electron microscopy. The electrical conductivity was measured in air as a function of temperature to 900 °C. Conductivity versus composition indicates that an increase in entropy has a marked effect on electrical conductivity, leading to two distinct relationships with temperature. |
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| ISSN: | 2073-4352 |