G. Dercz, L. Paja̧k, K. Prusik, R. Pielaszek, J. Malinowski
{"title":"用x射线衍射和电子显微镜研究了溶胶-凝胶法制备的纳米晶氧化镁粉末材料","authors":"G. Dercz, L. Paja̧k, K. Prusik, R. Pielaszek, J. Malinowski","doi":"10.1524/ZKSU.2009.0037","DOIUrl":null,"url":null,"abstract":"Materials with MgO nanocrystallites were prepared by sol-gel synthesis. Alcogels were dried either supercritically at 538 K or in supercritical CO2. Conventional drying was also applied. Structure studies were performed by X-ray diffraction, scanning and transmis- sion electron microcopies. Nitrogen adsorption/desorption measurements were also per- formed. Calcination of dry gels at 723 K under vacuum yielded MgO nanocrystallites. In the studied materials the presence of the amorphous phase was observed. It is also stated that MgO nanocrystallites are immersed in an amorphous matrix. Morphology of supercritically dried samples is similar; rough surface of powder particles is observed. Powder particles of conventionally dried sample are more compact. Size of MgO crystallites is generally similar for all samples and equal to about 7 nm despite the drying conditions of alcogels. The specific surface area and the volume of mesopores are the great- est for the sample supercritically dried at 538 K.","PeriodicalId":23897,"journal":{"name":"Zeitschrift Fur Kristallographie","volume":"46 1","pages":"255-260"},"PeriodicalIF":0.0000,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":"{\"title\":\"Nanocrystalline MgO powder materials prepared by sol-gel studied by X-ray diffraction and electron microscopy\",\"authors\":\"G. Dercz, L. Paja̧k, K. Prusik, R. Pielaszek, J. Malinowski\",\"doi\":\"10.1524/ZKSU.2009.0037\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Materials with MgO nanocrystallites were prepared by sol-gel synthesis. Alcogels were dried either supercritically at 538 K or in supercritical CO2. Conventional drying was also applied. Structure studies were performed by X-ray diffraction, scanning and transmis- sion electron microcopies. Nitrogen adsorption/desorption measurements were also per- formed. Calcination of dry gels at 723 K under vacuum yielded MgO nanocrystallites. In the studied materials the presence of the amorphous phase was observed. It is also stated that MgO nanocrystallites are immersed in an amorphous matrix. Morphology of supercritically dried samples is similar; rough surface of powder particles is observed. Powder particles of conventionally dried sample are more compact. Size of MgO crystallites is generally similar for all samples and equal to about 7 nm despite the drying conditions of alcogels. The specific surface area and the volume of mesopores are the great- est for the sample supercritically dried at 538 K.\",\"PeriodicalId\":23897,\"journal\":{\"name\":\"Zeitschrift Fur Kristallographie\",\"volume\":\"46 1\",\"pages\":\"255-260\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2009-09-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"5\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Zeitschrift Fur Kristallographie\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1524/ZKSU.2009.0037\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"Chemistry\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeitschrift Fur Kristallographie","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1524/ZKSU.2009.0037","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Chemistry","Score":null,"Total":0}
Nanocrystalline MgO powder materials prepared by sol-gel studied by X-ray diffraction and electron microscopy
Materials with MgO nanocrystallites were prepared by sol-gel synthesis. Alcogels were dried either supercritically at 538 K or in supercritical CO2. Conventional drying was also applied. Structure studies were performed by X-ray diffraction, scanning and transmis- sion electron microcopies. Nitrogen adsorption/desorption measurements were also per- formed. Calcination of dry gels at 723 K under vacuum yielded MgO nanocrystallites. In the studied materials the presence of the amorphous phase was observed. It is also stated that MgO nanocrystallites are immersed in an amorphous matrix. Morphology of supercritically dried samples is similar; rough surface of powder particles is observed. Powder particles of conventionally dried sample are more compact. Size of MgO crystallites is generally similar for all samples and equal to about 7 nm despite the drying conditions of alcogels. The specific surface area and the volume of mesopores are the great- est for the sample supercritically dried at 538 K.
期刊介绍:
Zeitschrift für Kristallographie International journal for structural, physical, and chemical aspects of crystalline materials ISSN 0044-2968 Founded in 1877 by Paul Groth Zeitschrift für Kristallographie is one of the world’s oldest scientific journals. In original papers, letters and review articles it presents results of theoretical or experimental study on crystallography.