J. Bijelić, Dalibor Tatar, M. Sahu, Z. Jagličić, I. Djerdj
The main objective of this work was to synthesize phase pure double perovskites Ba2NiTeO6 (BNTO) and Ba2NiWO6 (BNWO) in nanocrystalline form and to reveal the impact of nanocrystallinity on their magnetic and dielectric properties. The studied double perovskites were synthesized in nanocrystalline form by employing a citrate sol-gel route. A detailed investigation of their structure and properties using X-ray powder diffraction, scanning electron microscopy, Raman spectroscopy technique, energy-dispersive X-ray spectroscopy, SQUID magnetometry and electrical measurements is carefully described. Rietveld refinement of X-ray powder diffraction patterns revealed phase purity of both compounds: BNTO is trigonal (R-3m) while BNWO is cubic (Fm-3m). Raman spectroscopy studies reveal optical phonons that correspond to vibrations of Te6+/W6+O6 octahedra, while scanning electron microscopy images show irregular plate-like nanocrystals. Magnetic property measurements speak in favor of antiferromagnetic order but, in both compounds, size reduction affected their properties. BNTO has Néel temperature (TN) of 10.3 K which is higher than previously reported for its bulk form. Magnetic ground state of BNWO can be explained as canted antiferromagnetism with TN = 48.2 K. Room temperature measurements of dielectric constants at various frequencies suggest that these materials are high-κ dielectrics with low dielectric loss. The Nyquist plot reveals depressed a semicircle arc typical for non-Debye type of relaxation phenomena for BNWO ceramic, whereas for BNTO ceramic an almost straight line of Zʹʹ versus Z' has been observed, indicating its high insulating behavior. To conclude, size-dependent properties of studied double perovskites are discussed, introducing a possibility for implementation in electronic devices.
{"title":"Size reduction-induced properties modifications of antiferromagnetic dielectric nanocrystalline Ba2NiMO6 (M = W, Te) double perovskites","authors":"J. Bijelić, Dalibor Tatar, M. Sahu, Z. Jagličić, I. Djerdj","doi":"10.1093/oxfmat/itaa003","DOIUrl":"https://doi.org/10.1093/oxfmat/itaa003","url":null,"abstract":"\u0000 The main objective of this work was to synthesize phase pure double perovskites Ba2NiTeO6 (BNTO) and Ba2NiWO6 (BNWO) in nanocrystalline form and to reveal the impact of nanocrystallinity on their magnetic and dielectric properties. The studied double perovskites were synthesized in nanocrystalline form by employing a citrate sol-gel route. A detailed investigation of their structure and properties using X-ray powder diffraction, scanning electron microscopy, Raman spectroscopy technique, energy-dispersive X-ray spectroscopy, SQUID magnetometry and electrical measurements is carefully described. Rietveld refinement of X-ray powder diffraction patterns revealed phase purity of both compounds: BNTO is trigonal (R-3m) while BNWO is cubic (Fm-3m). Raman spectroscopy studies reveal optical phonons that correspond to vibrations of Te6+/W6+O6 octahedra, while scanning electron microscopy images show irregular plate-like nanocrystals. Magnetic property measurements speak in favor of antiferromagnetic order but, in both compounds, size reduction affected their properties. BNTO has Néel temperature (TN) of 10.3 K which is higher than previously reported for its bulk form. Magnetic ground state of BNWO can be explained as canted antiferromagnetism with TN = 48.2 K. Room temperature measurements of dielectric constants at various frequencies suggest that these materials are high-κ dielectrics with low dielectric loss. The Nyquist plot reveals depressed a semicircle arc typical for non-Debye type of relaxation phenomena for BNWO ceramic, whereas for BNTO ceramic an almost straight line of Zʹʹ versus Z' has been observed, indicating its high insulating behavior. To conclude, size-dependent properties of studied double perovskites are discussed, introducing a possibility for implementation in electronic devices.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41525341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
There are a few useful textbooks and online materials available on dynamic mechanical analysis (DMA) but no short and succinct article that will be useful for a beginner. Here we are providing a brief introductory overview of DMA, followed by details of the different types of measurements possible with a typical DMA instrument. Some of the important measures needing to be taken in these analyses are also summarized, along with the possibilities of designing new experiments with the help of a DMA instrument. Oscillatory stress/strain-assisted studies of two different types of membranes—a polymer membrane and a membrane which consists of assembled ultra-thin oxidized graphene flakes—are discussed at the end. These studies show the vast possibilities of DMA in understanding the different aspects of solids, such as their phase transitions, microstructure, damping, complex interactions in the composite matrix, and also about the mechanical modulus of the solid membrane. Hence this article discusses the new avenues for DMA in different fields and takes the reader from the fundamentals to its advanced applicability.
{"title":"Dynamic mechanical analysis in materials science: The Novice’s Tale","authors":"Sudeshna Patra, P. Ajayan, T. N. Narayanan","doi":"10.1093/oxfmat/itaa001","DOIUrl":"https://doi.org/10.1093/oxfmat/itaa001","url":null,"abstract":"\u0000 There are a few useful textbooks and online materials available on dynamic mechanical analysis (DMA) but no short and succinct article that will be useful for a beginner. Here we are providing a brief introductory overview of DMA, followed by details of the different types of measurements possible with a typical DMA instrument. Some of the important measures needing to be taken in these analyses are also summarized, along with the possibilities of designing new experiments with the help of a DMA instrument. Oscillatory stress/strain-assisted studies of two different types of membranes—a polymer membrane and a membrane which consists of assembled ultra-thin oxidized graphene flakes—are discussed at the end. These studies show the vast possibilities of DMA in understanding the different aspects of solids, such as their phase transitions, microstructure, damping, complex interactions in the composite matrix, and also about the mechanical modulus of the solid membrane. Hence this article discusses the new avenues for DMA in different fields and takes the reader from the fundamentals to its advanced applicability.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48357577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two-dimensional nanomaterials exhibit exceptional multifunctional properties including high-electron mobilities/saturation velocities, high surface to volume ratios, unique layered structures and mechanical compliance, positioning the class of materials to be influential in next-generation flexible electronics for applications in wearables and the Internet of things. In this perspective, three key areas of interest are identified that take advantage of the multifunctional nature of these materials including molecular sensing, van der Waals transfer and compliant radio frequency electronics. Significantly more progress needs to be made to realize commercialization of these materials, but the revolutionary accessible properties may reveal themselves in these three key areas of future flexible electronic systems.
{"title":"Toward 2D materials for flexible electronics: opportunities and outlook","authors":"N. Glavin, C. Muratore, M. Snure","doi":"10.1093/oxfmat/itaa002","DOIUrl":"https://doi.org/10.1093/oxfmat/itaa002","url":null,"abstract":"\u0000 Two-dimensional nanomaterials exhibit exceptional multifunctional properties including high-electron mobilities/saturation velocities, high surface to volume ratios, unique layered structures and mechanical compliance, positioning the class of materials to be influential in next-generation flexible electronics for applications in wearables and the Internet of things. In this perspective, three key areas of interest are identified that take advantage of the multifunctional nature of these materials including molecular sensing, van der Waals transfer and compliant radio frequency electronics. Significantly more progress needs to be made to realize commercialization of these materials, but the revolutionary accessible properties may reveal themselves in these three key areas of future flexible electronic systems.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/oxfmat/itaa002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47793187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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