Lithium lanthanum titanate perovskite ionic conductor: Influence of europium doping on structural and optical properties

Abstract

The present study reports the insertion of europium ions into the network of lithium lanthanum titanate, La 0.5 Li 0.5 TiO 3 , powders. The materials were prepared efficiently via the Pechini method and were characterized using thermogravimetric analyses, X-ray diffraction, high-resolution electron microscopy and photoluminescence spectroscopy. The results obtained demonstrate the high structural disorder of La 0.5 Li 0.5 TiO 3 (LLTO) as well as the different environments noticed by Eu 3+ ions in the La 0.5 Li 0.5 TiO 3 host lattice. Our results are essentially important once they unfold a better understanding of the complex nature of La 0.5 Li 0.5 TiO 3 compounds structure.

Review on Synthesis and Properties of Lithium Lanthanum Titanate

“…Other research groups used different reagents. Tetrabutyl titanate, the chemical composition of the substance is Ti[OCH(CH 3 ) 2 ] 4 , is reported as a source of Ti ions [52][53][54][55]. The sources for Li and La are usually LiNO 3 and La(NO 3 ) 8 [32,54,55].…”

“…The LLTO powder is then reground, pressed into pellets and sintered at 1250 • C. Kezionis [30] produced the gel, then dried it at 120 • C and calcinated the powder at 1000 • C for 5 h. The sintering temperature was approximately 1250 • C. Further examples of synthesis conditions are provided in Table 3. Generally, the temperature ranges employed are the following: evaporation 55-95 • C, drying 100-150 • C, calcination at 350-1000 • C (most authors report calcination temperatures in a narrower range 400-800 • C [1,31,32,[51][52][53][54]), sintering between 900 and 1350 • C (most publications between 1000 and 1250 • C [30,32,[51][52][53]56]).…”

Synthesis and characterization of an experimental 3Y-TZP dental ceramic prepared by polymeric precursors method

“…The first one (25-245ºC), was accompanied by a weight loss of 5.0 %, and was associated to water and solvent evaporation and to desorption of the gas adsorbed on powder surface. The second and more significant weight loss stage (13.8%) took place from 245 to 1300ºC and was related to the decomposition of polyester chain and carboxyl groups linked to metal with a consequent formation of crystalline metal-oxygen phase (Fernandes et al, 2018;Zhang et al, 2020;Kuo et al, 2011;Shi et al, 2014).…”

Luminescence and structural properties of Ca1-xZrO3:Eux: An experimental and theoretical approach

“…These high temperatures also help to form a symmetrical chemical environment for the Eu 3+ cations, increasing their luminescent emission and their lifetime decay (Fukushima et al, 2020;Shimokawa et al, 2015). Our research group is engaged in the investigation of the doping process with Eu 3+ cations in different semiconductors (Fernandes et al, 2018;Lovisa et al, 2016;Pinatti et al, 2019), in particular, CZ and CZE samples were previously obtained in another experimental works (André et al, 2014;Oliveira et al, 2017;Rosa et al, 2015).…”