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This article is cited in 1 scientific paper (total in 1 paper)
International Conference ''Mechanisms and Nonlinear Problems of Nucleation, Growth of Crystals and Thin Films'' dedicated to the memory of the outstanding theoretical physicist Professor V.V. Slezov (Proceedings) St. Petersburg, July 1-5, 2019
Phase transitions
The origin of phase transition and the usual evolutions of the unit-cell constants of the NASICON structures of the solid solution LiTi$_{2-x}$Ge$_{x}$(PO$_{4}$)$_{3}$
N. Bounar LIME Laboratory, University of Jijel, Algeria
Abstract:
Ge-doped LiTi$_{2}$(PO$_{4}$)$_{3}$ has been synthesized by a conventional solid-state reaction. Compounds LiM$_{2}^{\mathrm{(IV)}}$(PO$_{4}$)$_{3}$ with LTP-type structure present a different behaviour depending on nature of M$^{\mathrm{(IV)}}$. For M$^{\mathrm{(IV)}}$ = Ti and Ge, the structure shows the space group R3c, whereas for M$^{\mathrm{(IV)}}$ = Ge the space group is R3. Differences in behaviour of LiTi$_{2}$(PO$_{4}$)$_{3}$-LiGe$_{2}$(PO$_{4}$)$_{3}$ solid solutions are discussed in relation to the composition. Their structures LiTi$_{2-x}$Ge$_{x}$(PO$_{4}$)$_{3}$ (0 $\le x<$ 2) were determined from X-ray powder diffraction method (XRD) using Rietveld analysis. A sharp change in the lattice parameter $a$ is observed between the compositions with $x$ = 1. The lattice parameter c increases as the Ge content increases in the whole range of composition. The space group R3c becomes R3 for the composition with $x>$ 1. The SEM micrographs of the samples show relative porous microstructures due to the effect of the substitution.
Keywords:
NASICON, origin of unusual evolutions of lattice parameters, phase transition, scanning electron microscopy SEM, X-ray diffraction DRX, Rietveld refinements.
Received: 30.06.2019 Revised: 30.06.2019 Accepted: 01.07.2019
Citation:
N. Bounar, “The origin of phase transition and the usual evolutions of the unit-cell constants of the NASICON structures of the solid solution LiTi$_{2-x}$Ge$_{x}$(PO$_{4}$)$_{3}$”, Fizika Tverdogo Tela, 61:12 (2019), 2431; Phys. Solid State, 61:12 (2019), 2446–2450
Linking options:
https://www.mathnet.ru/eng/ftt8586 https://www.mathnet.ru/eng/ftt/v61/i12/p2431
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