Thermodynamic properties of calcium titanates: CaTiO3, Ca4Ti3O10, and Ca3Ti2O7

Jacob, Κ. T.; Abraham, K. P.

doi:10.1016/j.jct.2009.02.001

Cited by 31 publications

(23 citation statements)

References 18 publications

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“…1 30) , no phase exits inside of the small triangle of CaCaO-Ti. Although some phases stably exist in the quasi-binary phase diagram of TiO 2 and CaO [31][32][33] , no other phases were experimentally reported except for CaTiO 3 , when they coexist with CaCl 2 melt. Using the phase diagram equilibrated with CaCl 2 melt 30) , the route of the phase transition from TiO 2 to the metallic Ti is predicted as follows.…”

Section: Reduction Of Tio 2 In Cao-cacl 2 Meltmentioning

confidence: 99%

Reduction of CaTiO3 in Molten CaCl2 - as Basic Understanding of Electrolysis

et al. 2017

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Electrochemical decomposition of CaTiO 3 at the cathode was examined in a scheme of titanium metal production from natural deposit, Ilmenite (TiFeO 3 ). Based on the possible precipitation of CaTiO 3 from TiFeO 3 , the electrochemical decomposition of CaTiO 3 is here examined using combination of the calciothermic reduction and the electrolysis of CaO in the same molten salt. Inhomogeneous reduction in the cathodic basket is related with buoyancy of Ca and insuf cient dehydration. By optimizing the cooling conditions, CaO content in the molten salt, and dehydration method, an industrial level of 0.42 mass%O could be achieved as powder form.

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Section: Reduction Of Tio 2 In Cao-cacl 2 Meltmentioning

confidence: 99%

Reduction of CaTiO3 in Molten CaCl2 - as Basic Understanding of Electrolysis

et al. 2017

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“…A strong and sharp symmetric C-H flexion bond appears at 1384 cm -1 . The observed long period of stretching mode at 3440 cm -1 confirms -OH bond, which is more readily distinguishable at 500°C [51,52].…”

Section: Powder Characterisationmentioning

confidence: 76%

Effect of temperature on the electrical properties of nanocrystalline CaTi1−x Fe x O3−Δ perovskite

Mathu¹,

Nehru²,

Vinoth³

et al. 2015

J Mater Sci: Mater Electron

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Calcium titanate nanopowder doped with high content (1 M%) of iron was synthesized using simple sol-gel method. The four obtained samples were post-sintered at 100, 500, 900, and 1250°C to get soft agglomerates of nanocrystalline perovskites, which were deagglomerated by wet milling process using ethanol as a medium. The general stoichiometric formula for iron-doped CaTiO 3 was symbolized as CaTi 1-x Fe x O 3-d . The crystallographic structure of perovskites was found to be orthorhombic for all the four samples. The real and imaginary parts of the impedance values of sintered samples as a function of frequency were obtained using complex impedance spectroscopy. All the instrumental parameters were calibrated before initiating the measurements. The frequency range was set between 0.01 Hz and 1 MHz, and AC bias voltage was maintained at 50 mV. The objective of this work was to find the economical relevance of pioneering materials for electronic applications such as hydrogen production in fuel cells, solar plant, ferroelectric memory devices, microwave resonators, and sensible membranes as they are cheap and readily available, and can be prepared using controllable synthesis in a commercial laboratory.

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“…Viewed from this perspective, the cell emf is related to the difference in the chemical potential of CaO at the two electrodes:l CaO Based on thermodynamic data for Ca 3 Ti 8 Al 12 O 37 determined in this study and data for calcium titanates and aluminates reported earlier [7,14] and summarized in Table 2, subsolidus phase relations in the system Al 2 O 3 -TiO 2 -CaO can be computed using the free energy minimization procedure. The isothermal section of the phase diagram at 1200 K is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…[7] Only a brief account is given here. The electrode pellets were spring loaded on either side of transparent single crystal CaF 2 electrolyte with a gold mesh sandwiched between each electrode pellet and the electrolyte.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Gibbs Energy of Formation of Ca3Ti8Al12O37 and Phase Relations and Chemical Potentials in the System Al2O3-TiO2-CaO

Jacob

Rajitha

2012

J. Phase Equilib. Diffus.

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Thermodynamic properties of calcium titanates: CaTiO3, Ca4Ti3O10, and Ca3Ti2O7

Cited by 31 publications

References 18 publications

Reduction of CaTiO<sub>3</sub> in Molten CaCl<sub>2</sub> - as Basic Understanding of Electrolysis

Reduction of CaTiO<sub>3</sub> in Molten CaCl<sub>2</sub> - as Basic Understanding of Electrolysis

Effect of temperature on the electrical properties of nanocrystalline CaTi1−x Fe x O3−Δ perovskite

Gibbs Energy of Formation of Ca3Ti8Al12O37 and Phase Relations and Chemical Potentials in the System Al2O3-TiO2-CaO

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