E. K. Abdel-Khalek, E. A. Mohamed, Yasser A. M. Ismail
{"title":"研究了非化学计量CaMnO3-δ钙钛矿纳米颗粒中氧空位和Mn氧化态的作用","authors":"E. K. Abdel-Khalek, E. A. Mohamed, Yasser A. M. Ismail","doi":"10.1007/s10971-024-06632-1","DOIUrl":null,"url":null,"abstract":"<div><p>In this work, the low cost and eco-friendly CaMnO<sub>3-δ</sub> perovskite has been prepared by sol-gel method. Rietveld refinement of XRD data indicated that CaMnO<sub>3-δ</sub> sample crystallized in orthorhombic structure with space group Pnma. Further characterizations of this sample were performed employing TEM, SAED pattern, HR-TEM, and EDS elemental mapping. These measurements show that the CaMnO<sub>3-δ</sub> sample has polycrystalline nature with high degree of crystallinity and all elements are homogeneously distributed. The oxidation states of Mn ions and the presence of oxygen vacancies in this sample were confirmed by XPS analysis. Optical studies revealed that CaMnO<sub>3-δ</sub> sample has direct band gap energy (E<sub>g</sub>) of 3.63 eV using UV–vis spectroscopy. Asymmetric magnetic hysteresis (M − H) loop in CaMnO<sub>3-δ</sub> nanoparticles reveals that the presence of exchange bias phenomenon at room temperature. The present work provides the observation of pseudocapacitive behavior in CaMnO<sub>3-δ</sub> nanoparticles. Furthermore, the presence of oxygen vacancies and Mn oxidation states in CaMnO<sub>3-δ</sub> sample enhanced the charge storage capability by oxygen intercalation. These results prove that CaMnO<sub>3-δ</sub> perovskite is a promising material for magnetic and energy-storage applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"113 2","pages":"461 - 472"},"PeriodicalIF":2.3000,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10971-024-06632-1.pdf","citationCount":"0","resultStr":"{\"title\":\"Study the role of oxygen vacancies and Mn oxidation states in nonstoichiometric CaMnO3-δ perovskite nanoparticles\",\"authors\":\"E. K. Abdel-Khalek, E. A. Mohamed, Yasser A. M. Ismail\",\"doi\":\"10.1007/s10971-024-06632-1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this work, the low cost and eco-friendly CaMnO<sub>3-δ</sub> perovskite has been prepared by sol-gel method. Rietveld refinement of XRD data indicated that CaMnO<sub>3-δ</sub> sample crystallized in orthorhombic structure with space group Pnma. Further characterizations of this sample were performed employing TEM, SAED pattern, HR-TEM, and EDS elemental mapping. These measurements show that the CaMnO<sub>3-δ</sub> sample has polycrystalline nature with high degree of crystallinity and all elements are homogeneously distributed. The oxidation states of Mn ions and the presence of oxygen vacancies in this sample were confirmed by XPS analysis. Optical studies revealed that CaMnO<sub>3-δ</sub> sample has direct band gap energy (E<sub>g</sub>) of 3.63 eV using UV–vis spectroscopy. Asymmetric magnetic hysteresis (M − H) loop in CaMnO<sub>3-δ</sub> nanoparticles reveals that the presence of exchange bias phenomenon at room temperature. The present work provides the observation of pseudocapacitive behavior in CaMnO<sub>3-δ</sub> nanoparticles. Furthermore, the presence of oxygen vacancies and Mn oxidation states in CaMnO<sub>3-δ</sub> sample enhanced the charge storage capability by oxygen intercalation. These results prove that CaMnO<sub>3-δ</sub> perovskite is a promising material for magnetic and energy-storage applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":664,\"journal\":{\"name\":\"Journal of Sol-Gel Science and Technology\",\"volume\":\"113 2\",\"pages\":\"461 - 472\"},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2025-01-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1007/s10971-024-06632-1.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Sol-Gel Science and Technology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10971-024-06632-1\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Sol-Gel Science and Technology","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10971-024-06632-1","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Study the role of oxygen vacancies and Mn oxidation states in nonstoichiometric CaMnO3-δ perovskite nanoparticles
In this work, the low cost and eco-friendly CaMnO3-δ perovskite has been prepared by sol-gel method. Rietveld refinement of XRD data indicated that CaMnO3-δ sample crystallized in orthorhombic structure with space group Pnma. Further characterizations of this sample were performed employing TEM, SAED pattern, HR-TEM, and EDS elemental mapping. These measurements show that the CaMnO3-δ sample has polycrystalline nature with high degree of crystallinity and all elements are homogeneously distributed. The oxidation states of Mn ions and the presence of oxygen vacancies in this sample were confirmed by XPS analysis. Optical studies revealed that CaMnO3-δ sample has direct band gap energy (Eg) of 3.63 eV using UV–vis spectroscopy. Asymmetric magnetic hysteresis (M − H) loop in CaMnO3-δ nanoparticles reveals that the presence of exchange bias phenomenon at room temperature. The present work provides the observation of pseudocapacitive behavior in CaMnO3-δ nanoparticles. Furthermore, the presence of oxygen vacancies and Mn oxidation states in CaMnO3-δ sample enhanced the charge storage capability by oxygen intercalation. These results prove that CaMnO3-δ perovskite is a promising material for magnetic and energy-storage applications.
期刊介绍：
The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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