Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics
The polycrystalline Ca3Co4O9 oxide powders were synthesized by citrate acid sol-gel method, and the Ca3Co4O9 oxide ceramics with diverse grain alignments were prepared by sintering the pressed pellet bulks through controlling the procedures, respectively. The phase compositions, grain alignments, bu...
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| Format: | Article |
| Language: | English |
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Elsevier
2019-03-01
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| Series: | Results in Physics |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379718327864 |
| _version_ | 1819033913516883968 |
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| author | F.P. Zhang J.L. Shi J.W. Zhang X.Y. Yang J.X. Zhang |
| author_facet | F.P. Zhang J.L. Shi J.W. Zhang X.Y. Yang J.X. Zhang |
| author_sort | F.P. Zhang |
| collection | DOAJ |
| description | The polycrystalline Ca3Co4O9 oxide powders were synthesized by citrate acid sol-gel method, and the Ca3Co4O9 oxide ceramics with diverse grain alignments were prepared by sintering the pressed pellet bulks through controlling the procedures, respectively. The phase compositions, grain alignments, bulk microstructures, textures as well as the electrical transport properties were investigated by means of X-ray diffraction pattern XRD, scanning electron microscopy SEM, transmission electron microscopy TEM and electrical constant measurements apparatus. The results showed that the obtained Ca3Co4O9 ceramics with uniformly single phases and diverse grain alignments can be fabricated by modulating the preparing parameters; moreover, the grain alignment can be enhanced by applying the pressure of the sintering procedure. The Ca3Co4O9 ceramics with uniformly single phase and strongest grain alignment could be fabricated with formation pressure of 500 MPa and sintering pressure of 30 MPa. The sintering pressure is a key factor enhancing the grain alignment for this type of ceramics. The ceramic sample with highest grain alignment was found to have the highest electrical properties, which showed the maximum power factor value of 3.83 μW cm−1 K−2 at 700 °C. Keywords: Ca3Co4O9 ceramics, Preparation, Grain alignments, Electrical transport properties |
| first_indexed | 2024-12-21T07:25:23Z |
| format | Article |
| id | doaj.art-fb4faecca5a9453f8087fcb423085831 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-21T07:25:23Z |
| publishDate | 2019-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-fb4faecca5a9453f8087fcb4230858312022-12-21T19:11:41ZengElsevierResults in Physics2211-37972019-03-0112321326Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramicsF.P. Zhang0J.L. Shi1J.W. Zhang2X.Y. Yang3J.X. Zhang4Henan Provincial Engineering Laboratory of Building-Photovoltaics, Institute of Physics, Henan University of Urban Construction, 467036 Henan, People’s Republic of China; National Key Laboratory of Advanced Functional Materials, Chinese Ministry of Education, The College of Materials Science and Engineering, Beijing University of Technology, 100124 Beijing, People’s Republic of China; Corresponding author at: Henan Provincial Engineering Laboratory of Building-Photovoltaics, Institute of Physics, Henan University of Urban Construction, 467036 Henan, People’s Republic of China.Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, School of Materials Science and Engineering, Hefei University of Technology, 230009 Hefei, People’s Republic of ChinaAnhui Provincial Key Laboratory of Advanced Functional Materials and Devices, School of Materials Science and Engineering, Hefei University of Technology, 230009 Hefei, People’s Republic of ChinaAnhui Provincial Key Laboratory of Advanced Functional Materials and Devices, School of Materials Science and Engineering, Hefei University of Technology, 230009 Hefei, People’s Republic of ChinaHenan Provincial Engineering Laboratory of Building-Photovoltaics, Institute of Physics, Henan University of Urban Construction, 467036 Henan, People’s Republic of China; National Key Laboratory of Advanced Functional Materials, Chinese Ministry of Education, The College of Materials Science and Engineering, Beijing University of Technology, 100124 Beijing, People’s Republic of China; Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, School of Materials Science and Engineering, Hefei University of Technology, 230009 Hefei, People’s Republic of ChinaThe polycrystalline Ca3Co4O9 oxide powders were synthesized by citrate acid sol-gel method, and the Ca3Co4O9 oxide ceramics with diverse grain alignments were prepared by sintering the pressed pellet bulks through controlling the procedures, respectively. The phase compositions, grain alignments, bulk microstructures, textures as well as the electrical transport properties were investigated by means of X-ray diffraction pattern XRD, scanning electron microscopy SEM, transmission electron microscopy TEM and electrical constant measurements apparatus. The results showed that the obtained Ca3Co4O9 ceramics with uniformly single phases and diverse grain alignments can be fabricated by modulating the preparing parameters; moreover, the grain alignment can be enhanced by applying the pressure of the sintering procedure. The Ca3Co4O9 ceramics with uniformly single phase and strongest grain alignment could be fabricated with formation pressure of 500 MPa and sintering pressure of 30 MPa. The sintering pressure is a key factor enhancing the grain alignment for this type of ceramics. The ceramic sample with highest grain alignment was found to have the highest electrical properties, which showed the maximum power factor value of 3.83 μW cm−1 K−2 at 700 °C. Keywords: Ca3Co4O9 ceramics, Preparation, Grain alignments, Electrical transport propertieshttp://www.sciencedirect.com/science/article/pii/S2211379718327864 |
| spellingShingle | F.P. Zhang J.L. Shi J.W. Zhang X.Y. Yang J.X. Zhang Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics Results in Physics |
| title | Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics |
| title_full | Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics |
| title_fullStr | Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics |
| title_full_unstemmed | Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics |
| title_short | Grain alignment modulation and observed electrical transport properties of Ca3Co4O9 ceramics |
| title_sort | grain alignment modulation and observed electrical transport properties of ca3co4o9 ceramics |
| url | http://www.sciencedirect.com/science/article/pii/S2211379718327864 |
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