Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/67093
Título: | Unit cell volume reduction of Gd5(Si,Ge)4 nanoparticles controlled by bulk compressibility |
Autor(es): | Andrade, V. M. Belo, J. H. Checca, N. R. Rossi, A. Garcia, F. Almeida, B. Tedesco, J. C. G. Poulain, A. Pereira, A. M. Reis, M. S. Araújo, J. P. |
Palavras-chave: | Rietveld refinement Structural characterization Nanostructures Pulsed laser deposition Rietveld refinement |
Data: | 2020 |
Editora: | Elsevier 1 |
Revista: | Journal of Alloys and Compounds |
Citação: | Andrade, V. M., Belo, J. H., Almeida, B., et. al. (2020). Unit cell volume reduction of Gd5 (Si, Ge) 4 nanoparticles controlled by bulk compressibility. Journal of Alloys and Compounds, 849, 156384 |
Resumo(s): | The production of Gd5(Si,Ge)4 compounds in reduced dimensionality, through pulsed laser deposition (PLD), have shown their potential for practical applications. Here, we present nanoparticles ranging from 10 to 27 nm of average particle size of Gd5(SixGe1-x)4, with x = 0, 0.45 and 0.60, obtained using an Nd:Yag (1064 nm) and an Excimer KrF laser (248 nm). Synchrotron X-ray Diffraction measurements revealed a reduced unit cell volume in comparison to their bulk counterpart. The x = 0 sample presented a ~1.99% reduction while x = 0.45 composition, a shrinkage of ~1.81% on the unit cell volume that are a result of a structural change to a Gd5Si4-type structure [O(I)]. In contrast, x = 0.60 nanoparticles conserve the bulk crystal structure with ~ 0.95% of volume shrinkage. As a consequence, there is a change on the magnetic transition order from a first to a second one for all nanostructures followed by a magnetocaloric response reduction. These observations unveil a direct correlation between the bulk compressibility values and the unit cell shrinkage, suggesting that the rise of a surface stress plays a major role on the particle and unit cell dimensions. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/67093 |
DOI: | 10.1016/j.jallcom.2020.156384 |
ISSN: | 0925-8388 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S0925838820327481 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | PHYSICS OF QUANTUM MATERIALS AND BIONANOSTRUCTURES (2018 - ...) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Unit cell volume reduction of Gd5(Si,Ge)4 nanoparticles controlled by bulk compressibility.pdf | 2,28 MB | Adobe PDF | Ver/Abrir |