Analysis of structural, thermal and dielectric properties of LiTi2(PO4)3 ceramic powders (original) (raw)
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Analysis of structural and thermal properties of Li 2 TiO 3 ceramic powders
Li 2 TiO 3 ceramic powders have been developed by a solid state reaction method and those have been sintered at four different temperatures (600 8C, 700 8C, 800 8C and 900 8C) towards the optimization of sintering temperature that has been found to be at 800 8C based on the nature of the XRD profiles. The sample sintered at 800 8C has shown a good crystallinity situation from its XRD peaks and the sample is found to be in monoclinic structure which is in accordance with the reported data of JCPDS 33-0831. The SEM images for samples sintered at 600 8C, 700 8C, 800 and 900 8C, EDAX peaks, FTIR profile have been measured for the temperature optimized (800 8C) sample for understanding the structural details of Li 2 TiO 3 ceramic powders. Besides these, dielectric constant, dielectric loss and a.c. conductivities have been measured for the temperature optimized sample. In order to strengthen the observations made in the XRD profiles at four different temperatures, Raman spectra of those four sintered ceramic powders have also been studied. In respect of the thermal properties, only for the as synthesized (precursor) sample, simultaneous measurement of TG-DTA profiles has been carried out for analysis.
Mechanical milling assisted synthesis of novel LiTi 2 (PO 4 ) 3 -glass-ceramic nanocomposites
Journal of Non-Crystalline Solids, 2018
In order to enhance the ionic conductivity in Li + ion NASICONs, LiTi 2 (PO 4) 3 (LTP), novel LTP-glass-ceramic composites have been prepared by mechanical ball milling assisted synthesis route. Composites were prepared using Li + ion oxide glassy system (Li 2 SO 4) x-(LiPO 3) 100−x where x = 30 mol% and 60 mol%. The glass content in composite was fixed to 20 wt%. Structural, thermal and electrical properties of the novel composites reveal interesting results. X-ray diffraction and differential scanning calorimetry confirm the formation of LTPglass-ceramic composite. FESEM investigations performed on the samples suggest that LTP-glass-ceramics contain LTP grains of nano size with an appreciable homogeneity. In-grain (bulk) and grain boundary conductivity exhibit significant increase in the composites. A tentative mechanism of electrical transport has been proposed according to which glass-ceramic phase creates amorphous 'Li + ion rich regions' at the grain boundaries/interface. Concentration of Li + ions at the interface of LTP grains possibly leads to the enhanced electrical transport.
Electrical and mechanical properties of hot-pressed versus sintered LiTi2(PO4)3
Solid State Ionics, 2009
The electrical and mechanical properties of hot-pressed versus sintered LiTi 2 (PO 4) 3 were investigated. The hot-pressed LiTi 2 (PO 4) 3 had a higher density and larger average grain size than the sintered material. As a result of these microstructural differences the hot-pressed material exhibited a higher total ionic conductivity and lower hardness. The electronic conductivity of both materials was the same and increased by a factor of about 10 7 when the hot-pressed and sintered materials were heated under a reducing atmosphere.
LiV 3 O 8 ceramic powders have been prepared using a solid state reaction method at different (500 • C, 550 • C, 600 • C and 700 • C) temperatures. The X-ray diffraction profiles of these samples show that the ceramic powder sintered at 600 • C has a well defined monoclinic structure in a space group of P2 1 /m (11) with lattice parameters, a = 6.68 Å, b = 3.60 Å, c = 12.03 Å and α = γ = 90 o and β = 107 • and it is found to be in good agreement with the JCPDS Card No. 72–1193. The SEM image of this ceramic powder shows the distribution of grains in cylindrical rods form. Thermal (TG) property of as prepared precursor LiV 3 O 8 chemicals has been investigated. Raman and FTIR spectra of the temperature optimized (600 • C) ceramic powder have been carried out. Besides this, its dielectric constant (ε) and tangent loss as a function of frequency (100 Hz–1 MHz) and conductivities (σ ac and σ dc) have also been understood in evaluating its potentialities for different applications.