Structure transformations and reducibility of nanocrystalline Ce 1-xYb xO 2-(x/2) mixed oxides

Structure transformations and reducibility of nanocrystalline Ce 1-xYb xO 2-(x/2) mixed oxides. Małecka, b, M‥, Delgado, J‥, Kepiński, L., Calvino, J‥, Bernal, S., Blanco, G., & Chen, X. Catalysis Today, 187(1):56--64, 2012.

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This work presents results of multitechnique (HRTEM, EDX, XRD, XPS, ICP, BET and EELS) studies on structure evolution of nanocrystalline ceria-based Ce 1-xYb xO 2-(x/2) mixed oxides with increasing Yb content. Nano-sized (∼5 nm) mixed oxides were prepared by precipitation in water-in-oil (W/O) microemulsion method. No phase separation or/and segregation were observed for studied samples after heating in oxygen up to 950°C. Realistic models of the intermediate structures (defected F- and C-type) for mixed oxides and mechanism of CeO 2 → Ce 1-xYb xO 2-(x/2) → Yb 2O 3 structural changes have been proposed and tested (HRTEM images and diffraction patterns simulation). Reducibility of Ce 1-xYb xO 2-(x/2) mixed oxides and its changes with increasing of Yb content was measured and correlated with the structure features. The highest reducibility of Ce ions was observed for Ce 0.5Yb 0.5O 1.75, which has a structure intermediate between F and C-type, with maximum number of defects and the highest average strain. © 2012 Elsevier B.V. All rights reserved.

@article{ Małecka201256,
  abstract = {This work presents results of multitechnique (HRTEM, EDX, XRD, XPS, ICP, BET and EELS) studies on structure evolution of nanocrystalline ceria-based Ce 1-xYb xO 2-(x/2) mixed oxides with increasing Yb content. Nano-sized (∼5 nm) mixed oxides were prepared by precipitation in water-in-oil (W/O) microemulsion method. No phase separation or/and segregation were observed for studied samples after heating in oxygen up to 950°C. Realistic models of the intermediate structures (defected F- and C-type) for mixed oxides and mechanism of CeO 2 → Ce 1-xYb xO 2-(x/2) → Yb 2O 3 structural changes have been proposed and tested (HRTEM images and diffraction patterns simulation). Reducibility of Ce 1-xYb xO 2-(x/2) mixed oxides and its changes with increasing of Yb content was measured and correlated with the structure features. The highest reducibility of Ce ions was observed for Ce 0.5Yb 0.5O 1.75, which has a structure intermediate between F and C-type, with maximum number of defects and the highest average strain. © 2012 Elsevier B.V. All rights reserved.},
  annote = {cited By (since 1996) 0},
  author = {Małecka, M.A.a b and Delgado, J.J.b and Kepiński, L.a and Calvino, J.J.b and Bernal, S.b and Blanco, G.b and Chen, X.b},
  doi = {10.1016/j.cattod.2012.01.004},
  issn = {09205861},
  journal = {Catalysis Today},
  keywords = { C (programming language); Cerium compounds; Compu, Ytterbium,CeO <sub>2</sub>-Yb <sub>2</sub>O <sub>3</sub>; Ce},
  number = {1},
  pages = {56--64},
  title = {{Structure transformations and reducibility of nanocrystalline Ce 1-xYb xO 2-(x/2) mixed oxides}},
  url = {https://www.scopus.com/inward/record.url?eid=2-s2.0-84862804608\&partnerID=40\&md5=d9def8f282acf630486e7064da05282c},
  volume = {187},
  year = {2012}
}

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Nano-sized (∼5 nm) mixed oxides were prepared by precipitation in water-in-oil (W/O) microemulsion method. No phase separation or/and segregation were observed for studied samples after heating in oxygen up to 950°C. Realistic models of the intermediate structures (defected F- and C-type) for mixed oxides and mechanism of CeO 2 → Ce 1-xYb xO 2-(x/2) → Yb 2O 3 structural changes have been proposed and tested (HRTEM images and diffraction patterns simulation). Reducibility of Ce 1-xYb xO 2-(x/2) mixed oxides and its changes with increasing of Yb content was measured and correlated with the structure features. The highest reducibility of Ce ions was observed for Ce 0.5Yb 0.5O 1.75, which has a structure intermediate between F and C-type, with maximum number of defects and the highest average strain. © 2012 Elsevier B.V. All rights reserved.},\n annote = {cited By (since 1996) 0},\n author = {Małecka, M.A.a b and Delgado, J.J.b and Kepiński, L.a and Calvino, J.J.b and Bernal, S.b and Blanco, G.b and Chen, X.b},\n doi = {10.1016/j.cattod.2012.01.004},\n issn = {09205861},\n journal = {Catalysis Today},\n keywords = { C (programming language); Cerium compounds; Compu, Ytterbium,CeO 2-Yb 2O 3; Ce},\n number = {1},\n pages = {56--64},\n title = {{Structure transformations and reducibility of nanocrystalline Ce 1-xYb xO 2-(x/2) mixed oxides}},\n url = {https://www.scopus.com/inward/record.url?eid=2-s2.0-84862804608\\&partnerID=40\\&md5=d9def8f282acf630486e7064da05282c},\n volume = {187},\n year = {2012}\n}</pre>\n</div>\n\n\n<div class=\"well well-small bibbase\" id=\"abstract_Ma_ecka201256\"\n style=\"display:none\">\n This work presents results of multitechnique (HRTEM, EDX, XRD, XPS, ICP, BET and EELS) studies on structure evolution of nanocrystalline ceria-based Ce 1-xYb xO 2-(x/2) mixed oxides with increasing Yb content. Nano-sized (∼5 nm) mixed oxides were prepared by precipitation in water-in-oil (W/O) microemulsion method. No phase separation or/and segregation were observed for studied samples after heating in oxygen up to 950°C. Realistic models of the intermediate structures (defected F- and C-type) for mixed oxides and mechanism of CeO 2 → Ce 1-xYb xO 2-(x/2) → Yb 2O 3 structural changes have been proposed and tested (HRTEM images and diffraction patterns simulation). Reducibility of Ce 1-xYb xO 2-(x/2) mixed oxides and its changes with increasing of Yb content was measured and correlated with the structure features. The highest reducibility of Ce ions was observed for Ce 0.5Yb 0.5O 1.75, which has a structure intermediate between F and C-type, with maximum number of defects and the highest average strain. © 2012 Elsevier B.V. All rights reserved.\n</div>\n\n\n</div>\n","downloads":0,"keyword":["C (programming language); Cerium compounds; Compu","Ytterbium","CeO 2-Yb 2O 3; Ce"],"abstract":"This work presents results of multitechnique (HRTEM, EDX, XRD, XPS, ICP, BET and EELS) studies on structure evolution of nanocrystalline ceria-based Ce 1-xYb xO 2-(x/2) mixed oxides with increasing Yb content. Nano-sized (∼5 nm) mixed oxides were prepared by precipitation in water-in-oil (W/O) microemulsion method. No phase separation or/and segregation were observed for studied samples after heating in oxygen up to 950°C. Realistic models of the intermediate structures (defected F- and C-type) for mixed oxides and mechanism of CeO 2 → Ce 1-xYb xO 2-(x/2) → Yb 2O 3 structural changes have been proposed and tested (HRTEM images and diffraction patterns simulation). Reducibility of Ce 1-xYb xO 2-(x/2) mixed oxides and its changes with increasing of Yb content was measured and correlated with the structure features. The highest reducibility of Ce ions was observed for Ce 0.5Yb 0.5O 1.75, which has a structure intermediate between F and C-type, with maximum number of defects and the highest average strain. © 2012 Elsevier B.V. All rights reserved.","annote":"cited By (since 1996) 0","author":["Małecka","b, M.A.a","Delgado, J.J.b","Kepiński, L.a","Calvino, J.J.b","Bernal, S.b","Blanco, G.b","Chen, X.b"],"author_short":["Małecka","b, M‥","Delgado, J‥","Kepiński, L.","Calvino, J‥","Bernal, S.","Blanco, G.","Chen, X."],"bibtex":"@article{ Małecka201256,\n abstract = {This work presents results of multitechnique (HRTEM, EDX, XRD, XPS, ICP, BET and EELS) studies on structure evolution of nanocrystalline ceria-based Ce 1-xYb xO 2-(x/2) mixed oxides with increasing Yb content. Nano-sized (∼5 nm) mixed oxides were prepared by precipitation in water-in-oil (W/O) microemulsion method. No phase separation or/and segregation were observed for studied samples after heating in oxygen up to 950°C. Realistic models of the intermediate structures (defected F- and C-type) for mixed oxides and mechanism of CeO 2 → Ce 1-xYb xO 2-(x/2) → Yb 2O 3 structural changes have been proposed and tested (HRTEM images and diffraction patterns simulation). Reducibility of Ce 1-xYb xO 2-(x/2) mixed oxides and its changes with increasing of Yb content was measured and correlated with the structure features. The highest reducibility of Ce ions was observed for Ce 0.5Yb 0.5O 1.75, which has a structure intermediate between F and C-type, with maximum number of defects and the highest average strain. © 2012 Elsevier B.V. All rights reserved.},\n annote = {cited By (since 1996) 0},\n author = {Małecka, M.A.a b and Delgado, J.J.b and Kepiński, L.a and Calvino, J.J.b and Bernal, S.b and Blanco, G.b and Chen, X.b},\n doi = {10.1016/j.cattod.2012.01.004},\n issn = {09205861},\n journal = {Catalysis Today},\n keywords = { C (programming language); Cerium compounds; Compu, Ytterbium,CeO 2-Yb 2O 3; Ce},\n number = {1},\n pages = {56--64},\n title = {{Structure transformations and reducibility of nanocrystalline Ce 1-xYb xO 2-(x/2) mixed oxides}},\n url = {https://www.scopus.com/inward/record.url?eid=2-s2.0-84862804608\\&partnerID=40\\&md5=d9def8f282acf630486e7064da05282c},\n volume = {187},\n year = {2012}\n}","bibtype":"article","doi":"10.1016/j.cattod.2012.01.004","id":"Małecka201256","issn":"09205861","journal":"Catalysis Today","key":"Małecka201256","keywords":"C (programming language); Cerium compounds; Compu, Ytterbium,CeO 2-Yb 2O 3; Ce","number":"1","pages":"56--64","title":"Structure transformations and reducibility of nanocrystalline Ce 1-xYb xO 2-(x/2) mixed oxides","type":"article","url":"https://www.scopus.com/inward/record.url?eid=2-s2.0-84862804608\\&partnerID=40\\&md5=d9def8f282acf630486e7064da05282c","volume":"187","year":"2012","role":"author","urls":{"Paper":"https://www.scopus.com/inward/record.url?eid=2-s2.0-84862804608\\&partnerID=40\\&md5=d9def8f282acf630486e7064da05282c"},"bibbaseid":"-b-delgado-kepiski-calvino-bernal-blanco-chen-structuretransformationsandreducibilityofnanocrystallinece1xybxo2x2mixedoxides-2012"},"bibtype":"article","biburl":"http://www2.uca.es/dept/cmat_qinor/nanomat/People/Delgado.bib","downloads":0,"search_terms":["structure","transformations","reducibility","nanocrystalline","xyb","mixed","oxides","małecka","b","delgado","kepiński","calvino","bernal","blanco","chen"],"title":"Structure transformations and reducibility of nanocrystalline Ce 1-xYb xO 2-(x/2) mixed oxides","title_words":["structure","transformations","reducibility","nanocrystalline","xyb","mixed","oxides"],"year":2012,"dataSources":["FMdTKEbMWYtQ7jKBs"]}