Thermodynamic properties of Pr7O12

Jacob, Κ. T.; Muraleedharan, Srilekshmi

doi:10.1016/j.jct.2019.04.021

Cited by 1 publication

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“…The isothermal section of the phase diagram of the system Pr–Rh–O at 1200 K computed from thermodynamic data of praseodymium oxides, liquid alloy, intermetallic compounds and PrRhO 3 using Gibbs energy minimization procedure is shown in Figure . Along the Pr–O boundary, Pr 2 O 3 and Pr 7 O 12 are the stable oxides at 1200 K. Pr 2 O 3 has hexagonal structure with space group P

\overset{3}{true}

m 1 (A‐rare earth).…”

Section: Resultsmentioning

confidence: 99%

“…Along the Pr–O boundary, Pr 2 O 3 and Pr 7 O 12 are the stable oxides at 1200 K. Pr 2 O 3 has hexagonal structure with space group P

\overset{3}{true}

m 1 (A‐rare earth). Similarly, β ‐Rh 2 O 3 is the only stable oxide along the Rh‐O binary system with orthorhombic structure (space group Pbca (61)) at 1200 K. The Gibbs energy of formation of Pr 2 O 3 is taken from a recent reassessment and that for Rh 2 O 3 is given by Equation …”

Section: Resultsmentioning

confidence: 99%

“…Above this, there are two two‐phase fields; Rh + PrRhO 3 , Pr 2 O 3 + PrRhO 3 . At higher oxygen potential (

Δ μ_{O_{2}} = - 38.643 kJ {mol}^{- 1} false)

, metal Rh oxidizes to Rh 2 O 3 and at

Δ μ_{O_{2}} = - 42.386 kJ {mol}^{- 1}

Pr 2 O 3 oxidizes to Pr 7 O 12 . Additional two‐phase regions; Rh 2 O 3 + PrRhO 3 , Pr 7 O 12 + PrRhO 3 are generated at the respective higher oxygen potentials.…”

Section: Resultsmentioning

confidence: 99%

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Thermodynamic properties of PrRhO₃ and phase diagrams of the system Pr–Rh–O

Jacob

Muraleedharan

2019

J Am Ceram Soc

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A solid‐state electrochemical cell with yttria‐stabilized zirconia (YSZ) as the electrolyte is used to measure accurately thermodynamic properties of PrRhO3 in the range of temperature from 875 to 1325 K. The standard Gibbs energy of formation of PrRhO3 with orthorhombically distorted perovskite structure from its binary oxides β‐Rh2O3 and hexagonal Pr2O3 is given by, ΔGf)(oxo±50/Jmol-1=-67813+5.299T/K. Invoking the Newmann‐Kopp rule, the standard enthalpy of formation from elements and standard entropy of PrRhO3 at 298.15 K are evaluated: ΔHfo=-1175.53±3.26kJmol-1 and Snormalo=108.89±0.1.3J mol-1normalK-1. Phase relations in the system Pr–Rh–O at 1200 K are computed from thermodynamic data. Calorimetric data on enthalpy of formation of two intermetallic compounds are combined with the semi‐empirical model of Miedema and phase diagram to estimate Gibbs energy of formation for the intermetallics and liquid alloys. An isothermal section of ternary phase diagram, an oxygen potential‐composition diagram in 2‐D and a 3‐D chemical potential diagram for the system Pr–Rh–O at 1200 K are presented. In addition, temperature‐composition diagrams at different oxygen pressures are developed. The diagrams provide a road map for design and optimization of processing routes for catalysts based on Rh.

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\overset{3}{true}

m 1 (A‐rare earth).…”

Section: Resultsmentioning

confidence: 99%

“…Along the Pr–O boundary, Pr 2 O 3 and Pr 7 O 12 are the stable oxides at 1200 K. Pr 2 O 3 has hexagonal structure with space group P

\overset{3}{true}

Section: Resultsmentioning

confidence: 99%

“…Above this, there are two two‐phase fields; Rh + PrRhO 3 , Pr 2 O 3 + PrRhO 3 . At higher oxygen potential (

Δ μ_{O_{2}} = - 38.643 kJ {mol}^{- 1} false)

, metal Rh oxidizes to Rh 2 O 3 and at

Δ μ_{O_{2}} = - 42.386 kJ {mol}^{- 1}

Pr 2 O 3 oxidizes to Pr 7 O 12 . Additional two‐phase regions; Rh 2 O 3 + PrRhO 3 , Pr 7 O 12 + PrRhO 3 are generated at the respective higher oxygen potentials.…”

Section: Resultsmentioning

confidence: 99%

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