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Phase relations and electrical properties in the pseudo-ternary La2O3–TiO2–Mn2O3 system in air

✍ Scribed by Srečo Davor Škapin; Špela Kunej; Danilo Suvorov

Book ID: 104022923
Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 665 KB
Volume: 28
Category: Article
ISSN: 0955-2219
DOI: 10.1016/j.jeurceramsoc.2008.05.022

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✦ Synopsis

Scanning electron microscopy (SEM), electron-probe microanalysis, energy-and wavelength-dispersive X-ray analysis and X-ray powder diffraction were used to investigate the subsolidus phase relations in the pseudo-ternary La 2 O 3 -TiO 2 -Mn 2 O 3 system in air (oxygen partial pressure p O 2 = 0.21 atm) at 1275 • C. The addition of Mn 2 O 3 to the starting La 2 O 3 :3TiO 2 mixture led to the formation of a La-deficient perovskite La 2/3 TiO 3 compound. The oxides form two new compounds with the proposed compositions: (i) La 1.7 Ti 13.0 Mn 6.3 O 38-x , with a davidite-like crystal structure, and (ii) La 49 Ti 18 Mn 13 O 129 . There were also several solid solutions existing over a wide range of concentrations.

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