Title The influence of titanium substitution on phase transition energy and crystalline composition in the complex La2−xTixMo2O9+x/2 system
Authors Gaidamavičienė, Giedrė ; Labutis, Jonas ; Elsts, Edgars ; Gabrusenoks, Jevgenijs ; Koņuhova, Marina ; Popov, Anatoli I ; Žalga, Artūras
DOI 10.3390/app16052209
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Is Part of Applied sciences.. Basel : MDPI. 2026, vol. 16, iss. 5, art. no. 2209, p. [1-26].. eISSN 2076-3417
Keywords [eng] phase transition ; Raman spectroscopy ; Rietveld refinement ; sol–gel synthesis ; thermal analysis ; X-ray diffraction
Abstract [eng] Featured Application: This study presents the development of novel LAMOX-based, doped, complex multicomponent La2−xTixMo2O9+x/2 systems, synthesized using innovative, environmentally friendly approaches. Investigating crystal structure evolution and thermal effects associated with phase transitions provides insight into the mechanisms governing ionic conductivity changes during high-temperature phase transitions. These findings establish a scientific basis for the potential application of such ceramic materials as solid electrolytes in solid oxide fuel cells, supporting their practical role in energy conversion technologies. The aqueous sol–gel preparation technique was successfully employed for synthesizing a homogeneous La–Ti–Mo–O tartrate gel precursor, and thermal treatment at 1000 °C promoted the formation of nanocrystalline complex La2−xTixMo2O9+x/2 ceramic. X-ray diffraction analysis revealed a consistent influence of increasing the degree of titanium substitution on the formation of the La2Mo2O3 and La2MoO6 impurity phases within the crystalline mixture. Meanwhile, the stability of the high-temperature cubic β-La2Mo2O9 phase in the La2−xTixMo2O9+x/2 system at room temperature highlighted the distinct influence of titanium content from structural and thermodynamic perspectives. However, the Raman spectroscopy analysis showed no distinct variations in the spectra of La2−xTixMo2O9+x/2 samples, suggesting a substantial effect of titanium on the phase transition behavior between the low-temperature monoclinic α-La2Mo2O9 and the high-temperature cubic β-La2Mo2O9 phases.
Published Basel : MDPI
Type Journal article
Language English
Publication date 2026
CC license CC license description