Raman Spectroscopy of Superionic Ti Dope Li3Fe2(PO4)3 and LiNiPO4
SCIE
SCOPUS
- Title
- Raman Spectroscopy of Superionic Ti Dope Li3Fe2(PO4)3 and LiNiPO4
- Authors
- Butt, G; Sammes, N; Tompsett, G; Smirnova, A; Yamamoto, O
- Date Issued
- 2004-07-12
- Publisher
- Elsevier
- Abstract
- The Raman spectra of two systems, namely titanium-doped lithium iron and lithium nickel phosphates have been investigated. At room temperature, Li3Fe2(PO4)(3) is reported having a monoclinic structure with P2(1)/n space group, and transforms to a rhombohedral structure (gamma-phase) with Pcan space group above 513 K. An orthorhombic structure with Pnma space group is reported for LiNiPO4 and Ti-doped LiNiPO4 polycrystalline samples. The Raman spectra of the first system, specifically Li3Fe2(PO4)(3) and Ti-doped Li3Fe2(PO4)(3), are assigned with respect to band positions reported in the literature for Li3Fe2(PO4)(3) and Fe-2(SO4)(3) and, Nasicon-type compounds Li3In2(PO4)(3) and Na3Fe2(PO4)(3). Although spectra show a marked change in the broadness and number of bands observed, the overall profile is similar to alpha-Li3Fe2(PO4)(3) which indicates up to 20 mol% solubility of titanium in the Li3Fe2(PO4)(3) phase. The second LiNiPO4 system shows mixed phase behaviour and is composed of orthorhombic LiNiPO4 and a secondary phase, likely a titanium phosphate. With increasing Ti-dopant concentration up to 20 mol%, there is an increase in the relative proportion of the secondary phase, characterised by a strong band at 784 cm(-1). (C) 2004 Elsevier B.V. All rights reserved.
- Keywords
- lithium-iron and lithium-nickel phosphates; Raman spectroscopy; titanium doping; superconductivity; PHASE-TRANSITION; DISORDER; CONDUCTION; FEATURES; NASICON; SPECTRA
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15356
- DOI
- 10.1016/J.JPOWSOUR.2004.01.053
- ISSN
- 0378-7753
- Article Type
- Article
- Citation
- Journal of power sources, vol. 134, no. 1, page. 72 - 79, 2004-07-12
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