Thermodynamic evidence for order–disorder transition in NiTiO3

Jacob, Κ. T.; Saji, Viswanathan S.; Reddy, S. N. S.

doi:10.1016/j.jct.2006.07.016

Cited by 29 publications

(15 citation statements)

References 21 publications

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“…We employed investigations at long and short range to inhibit the structural order-disorder degree of the main phase. In other way, Jacob et al [26] evidenced that this phase present an order-disorder transition.…”

Section: Fourier Transform Raman Analysismentioning

confidence: 93%

NiTiO3 powders obtained by polymeric precursor method: Synthesis and characterization

Lopes

Cavalcante

Simões

et al. 2009

Journal of Alloys and Compounds

125

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Section: Fourier Transform Raman Analysismentioning

confidence: 93%

NiTiO3 powders obtained by polymeric precursor method: Synthesis and characterization

Lopes

Cavalcante

Simões

et al. 2009

Journal of Alloys and Compounds

125

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“…Electrical shielding of the cell leads was affected by platinum sheet wrapped around the alumina tube and maintained at ground potential. The temperature of the furnace was controlled to ±1 K. Similar setup was used recently to study the thermodynamic properties of NiTiO 3 [15]. The reversibility of each cell was confirmed by microcoulometric titration ($50 lA for 300 s) of oxygen in both directions.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Role of entropy in the stability of cobalt titanates

Jacob¹,

Rajitha²

2010

The Journal of Chemical Thermodynamics

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“…the standard Gibbs energy change is given by Jacob et al [7] DG o 3 ¼ À503468 þ 253:283T À 9:796T ln T J/mol ðEq 4Þ…”

Section: Thermodynamic Properties Of the Oxide Solid Solutionmentioning

confidence: 99%

“…The value for the Gibbs energy change for the exchange reaction is DG o 5 ¼ À65226 ðAE160Þ J/mol at 1273 K. The value of standard Gibbs energy is in good agreement with the value of DG o 5 ¼ À64353 ðAE300Þ J/mol calculated from direct thermodynamic measurements using solid oxide galvanic cells. [6,7] …”

Section: Basic and Applied Research: Section Imentioning

confidence: 99%

Activities in the FeTiO3-NiTiO3 Solid Solution from Alloy-Oxide Equilibria at 1273 K

Jacob

Raj

Reddy

2009

J. Phase Equilib. Diffus.

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Nine tie-lines between Fe-Ni alloys and FeTiO 3 -NiTiO 3 solid solutions were determined at 1273 K. Samples were equilibrated in evacuated quartz ampoules for periods up to 10 days. Compositions of the alloy and oxide phases at equilibrium were determined by energy-dispersive x-ray spectroscopy. X-ray powder diffraction was used to confirm the results. Attainment of equilibrium was verified by the conventional tie-line rotation technique and by thermodynamic analysis of the results. The tie-lines are skewed toward the FeTiO 3 corner. From the tie-line data and activities in the Fe-Ni alloy phase available in the literature, activities of FeTiO 3 and NiTiO 3 in the ilmenite solid solution were derived using the modified Gibbs-Duhem technique of Jacob and Jeffes [K.T. Jacob and J.H.E. Jeffes, An Improved Method for Calculating Activities from Distribution Equilibria, High Temp. High Press., 1972, 4, p 177-182]. The components of the oxide solid solution exhibit moderate positive deviations from Raoult's law. Within experimental error, excess Gibbs energy of mixing for the FeTiO 3 -NiTiO 3 solid solution at 1273 K is a symmetric function of composition and can be represented as:Full spectrum of tie-lines and oxygen potentials for the three-phase equilibrium involving Fe-Ni alloys, FeTiO 3 -NiTiO 3 solid solutions, and TiO 2 at 1273 K were computed using results obtained in this study and data available in the literature.

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Thermodynamic evidence for order–disorder transition in NiTiO3

Cited by 29 publications

References 21 publications

NiTiO3 powders obtained by polymeric precursor method: Synthesis and characterization

NiTiO3 powders obtained by polymeric precursor method: Synthesis and characterization

Role of entropy in the stability of cobalt titanates

Activities in the FeTiO3-NiTiO3 Solid Solution from Alloy-Oxide Equilibria at 1273 K

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