Aqueous sol–gel synthesis, thermoanalytical study and electrical properties of La2Mo2O9

Control of experimental conditions in reaction flash-sintering of complex stoichiometry ceramics

“…The electrical properties of the Bi0.93La0.07FeO3 specimen prepared by reaction flash sintering at 100 V cm -1 and 40 mA mm -2 were measured by impedance spectroscopy. This technique has been proved a powerful tool for testing the quality of different kinds of ceramic materials, because it is extremely sensitive to the stoichiometry, the microstructure and the presence of secondary phases and vacancies [38,[54][55][56][57][58][59][60][61][62].…”

Thermoanalytical and X-ray Diffraction Studies on the Phase Transition of the Calcium-Substituted La2Mo2O9 System

“…Tartaric acid (L–(+)–Tartaric acid (C 4 H 6 O 6 ) (TA) ≥ 99.5% Sigma-Aldrich (Darmstadt, Germany)) was applied for escalation of solubility via coordination of starting compounds in the reaction mixture, especially during the pH changes and evaporation before sol-gel formation. The mechanism of the corresponding chemical process in the frame of the aqueous tartaric acid-assisted synthesis for the preparation of the La–Mo–O gel precursor was discussed in our previous work [ 35 ]. Finally, the obtained La−Ca−Mo−O tartrate gel precursor for La 2−x Ca x Mo 2 O 9−x/2 ceramics was heat-treated for 5 h at 1000 °C in the air atmosphere.…”

Aqueous sol–gel synthesis, thermoanalytical, structural and vibrational studies of lithium aluminium molybdate (LiAlMo2O8)

“…Excess ammonia is removed from the reaction mixture during further heating of the reaction mixture until 90% of the water is evaporated. The addition of tartaric acid (L-(+)-tartaric acid (C 4 H 6 O 6 ) (TA) 99.5% Roth) to the reaction mixture creates a coordination compound for [(MoO 4 ) p (C 4 H 4 O 6 ) q H r ] (2p+2q-r)composition [16,17]. Generally, the chemical reaction that occurred after this procedure can be written as shown in Eq.…”