2024-03-29T10:43:01Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1879552019-09-27T10:21:49Zcom_10261_89com_10261_3col_10261_342
DIGITAL.CSIC
author
Durán, Teresa
author
Climent-Pascual, Esteban
author
Pérez-Prior, Maria T.
author
Levenfeld, Belén
author
Varez, Alejandro
author
Sobrados, Isabel
author
Sanz Lázaro, Jesús
funder
Comunidad de Madrid
funder
Ministerio de Economía y Competitividad (España)
funder
European Commission
2019-08-09T09:19:57Z
2019-08-09T09:19:57Z
2017-02
Advanced Powder Technology 28(2): 514-520 (2017)
0921-8831
http://hdl.handle.net/10261/187955
10.1016/j.apt.2016.10.020
1568-5527
http://dx.doi.org/10.13039/100012818http://dx.doi.org/10.13039/501100003329http://dx.doi.org/10.13039/501100000780
The topotactic Li/H exchange in LiLaTiO has been studied in different aqueous and non-aqueous media with different acidity. With this purpose, aqueous hydrochloric and nitric acid solutions and benzoic acid/ethanol solution were employed. The pristine and exchanged samples have been characterized by H and Li MAS-NMR, TGA and XRD techniques. Aqueous hydrochloric and nitric acid solutions produce the powders degradation and the subsequent formation of LiTiO and LaTiO phases. A detailed analysis of the H MAS NMR spectra of exchanged samples indicate that Li/H exchange reaction in pure water produced formation of LiOH at the particles surface, band at 0 ppm, that could subsequently carbonated after exposition in air. Furthermore the presence of other OH signals at 8, 6 and 2 ppm has been related to differences on octahedral Ti-O distances, produced by La/vacancy ordering in alternating planes of perovskites. In samples immersed into benzoic acid/ethanol solution results are similar, however the amount of LiOH species in particle surface is considerable lower. The exchange degree improved when increasing exchange temperature. The mechanical grinding of powders decreases the particle size improving exchange reactions; however, grinding treatments eliminated specific NMR bands of perovskite. In ground materials new H NMR bands at 6 and 4 ppm were ascribed to an amorphous phase.
eng
closedAccess
LLTO perovskite
Li+/H+ exchange
Benzoic acid
1H and 7Li MAS-NMR
Aqueous and non-aqueous Li+/H+ ion exchange in Li0.44La0.52TiO3 perovskite
artículo
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URL
https://digital.csic.es/bitstream/10261/187955/1/accesoRestringido.pdf
File
MD5
42637ae8545636bc41605c1740a9a84e
15753
application/pdf
accesoRestringido.pdf