Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore
In order to establish the effective application of materials in a particular area, it is important to first investigate the physical and chemical properties, such as the crystallinity, structure, and the optical and surface properties. The objective of the present study is to fabricate thermally sta...
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MDPI AG
2021-11-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/12/1463 |
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| author | Fahad Alharthi Rizwan Wahab Salim Manoharadas Basel F. Alrayes Naushad Ahmad |
| author_facet | Fahad Alharthi Rizwan Wahab Salim Manoharadas Basel F. Alrayes Naushad Ahmad |
| author_sort | Fahad Alharthi |
| collection | DOAJ |
| description | In order to establish the effective application of materials in a particular area, it is important to first investigate the physical and chemical properties, such as the crystallinity, structure, and the optical and surface properties. The objective of the present study is to fabricate thermally stable pyrochlore oxides, namely, lanthanum zirconate (La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, LZ) and Ni-doped lanthanum zirconate (La<sub>2</sub>Zr<sub>1.5</sub>Ni<sub>0.5</sub>O<sub>7</sub>, LZN) by the solid-state and sol-gel methods. The effects of the preparation and substitution of Zr<sup>4+</sup> by Ni<sup>2+</sup> for the resulting nanocrystalline samples were characterized in terms of structure, purity, porosity, the thermal and optical properties, and photoluminescence by different techniques: XRD, FT-IR, BET, EDS, TG-DTG, UV-Vis-DRS, and PL. The XRD results confirm that the pyrochlores prepared via the sol-gel method (LZ-sg and LZN-sg) had a cubic unit-cell lattice, whereas the solid-state method (LZ-s and LZN-s) had impurities of the oxides. The XRD patterns, LZ-sg and LZN-sg, were further treated with the Rietveld technique. The textural measurements reveal that LZ-sg had a higher BET surface area compared to LZN-sg. In addition, the substitution of Zr<sup>4+</sup> by the Ni<sup>2+</sup> ion provides rational evidence for the improvement in the oxygen mobility, as well as the optical and photoluminescence properties through the lowering of the optical band energy and the electron–hole pairs. |
| first_indexed | 2024-03-10T04:21:30Z |
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| publishDate | 2021-11-01 |
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| spelling | doaj.art-00b099ae4a4d4bd9a3c2cea6f5acaac82023-11-23T07:48:04ZengMDPI AGCrystals2073-43522021-11-011112146310.3390/cryst11121463Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate PyrochloreFahad Alharthi0Rizwan Wahab1Salim Manoharadas2Basel F. Alrayes3Naushad Ahmad4Department of Chemistry, College of Science, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi ArabiaDepartment of Zoology, College of Science, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi ArabiaCentral Laboratory, Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi ArabiaCentral Laboratory, College of Science, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi ArabiaDepartment of Chemistry, College of Science, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi ArabiaIn order to establish the effective application of materials in a particular area, it is important to first investigate the physical and chemical properties, such as the crystallinity, structure, and the optical and surface properties. The objective of the present study is to fabricate thermally stable pyrochlore oxides, namely, lanthanum zirconate (La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>, LZ) and Ni-doped lanthanum zirconate (La<sub>2</sub>Zr<sub>1.5</sub>Ni<sub>0.5</sub>O<sub>7</sub>, LZN) by the solid-state and sol-gel methods. The effects of the preparation and substitution of Zr<sup>4+</sup> by Ni<sup>2+</sup> for the resulting nanocrystalline samples were characterized in terms of structure, purity, porosity, the thermal and optical properties, and photoluminescence by different techniques: XRD, FT-IR, BET, EDS, TG-DTG, UV-Vis-DRS, and PL. The XRD results confirm that the pyrochlores prepared via the sol-gel method (LZ-sg and LZN-sg) had a cubic unit-cell lattice, whereas the solid-state method (LZ-s and LZN-s) had impurities of the oxides. The XRD patterns, LZ-sg and LZN-sg, were further treated with the Rietveld technique. The textural measurements reveal that LZ-sg had a higher BET surface area compared to LZN-sg. In addition, the substitution of Zr<sup>4+</sup> by the Ni<sup>2+</sup> ion provides rational evidence for the improvement in the oxygen mobility, as well as the optical and photoluminescence properties through the lowering of the optical band energy and the electron–hole pairs.https://www.mdpi.com/2073-4352/11/12/1463pyrochloresRietveld refinementopticaltexturethermalphotoluminescence |
| spellingShingle | Fahad Alharthi Rizwan Wahab Salim Manoharadas Basel F. Alrayes Naushad Ahmad Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore Crystals pyrochlores Rietveld refinement optical texture thermal photoluminescence |
| title | Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore |
| title_full | Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore |
| title_fullStr | Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore |
| title_full_unstemmed | Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore |
| title_short | Effect of Preparation Method and Ni<sup>2+</sup> Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore |
| title_sort | effect of preparation method and ni sup 2 sup substitution on the structural thermal and optical properties of nanocrystalline lanthanum zirconate pyrochlore |
| topic | pyrochlores Rietveld refinement optical texture thermal photoluminescence |
| url | https://www.mdpi.com/2073-4352/11/12/1463 |
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