High-temperature X-ray diffractometric studies of LaCrO3

Momin, A.C.; Mirza, E. B.; Mathews, M.D.

doi:10.1007/bf00720935

Cited by 44 publications

(40 citation statements)

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“…These results are in agreement with those from Momin et al [7]. They found that the coefficients of the average linear thermal expansions for UO 2 The density variations with temperature can be obtained from the thermal expansion data using the following equation [18]:…”

Section: Resultssupporting

confidence: 82%

“…It also increases with an increase in the burn-up which represents the content of dissolved fission products in UO 2 . As Momin et al [7] noted, the higher values for the simulated fuels indicate that the partial substitution of U 4+ with (Y, La, Nd, and Ce) 3+ added to the simulated fuels results in a weakening of the interatomic bonding in the solid solution matrix.…”

Section: Resultsmentioning

confidence: 85%

“…Hutchings [6] and Tyagi and Mathews [10] investigated thermal expansions by measuring the lattice parameters with the temperature of (Th, U)O 2 . Momin et al [7] studied the lattice thermal expansion behavior of UO 2 , ThO 2 , and (U 0.2 Th 0.8 )O 2 doped with fission product oxides. Yamashita et al studied the thermal expansions of NpO 2 and some other actinide dioxides [8] and (Np, U)O 2 [9].…”

mentioning

confidence: 99%

“…The importance of the thermal expansion of nuclear fuel has led to numerous experimental studies using high temperature X-ray and neutron diffraction techniques [3][4][5][6][7][8][9][10][11] and the dilatometer [12][13][14]. X-ray and neutron diffraction provide lattice parameters, and the dilatometer provides macroscopic length changes including the effects of the Schottky defect.…”

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confidence: 99%

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Thermal Expansion of Simulated Fuels with Dissolved Fission Products in a UO2 Matrix

Kang

Park

et al. 2009

Int J Thermophys

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As a part of the DUPIC (direct use of spent PWR fuel in CANDU reactors) fuel development program, the thermal expansion of simulated spent fuel pellets with dissolved fission products has been studied by using a thermo-mechanical analyzer (TMA) in the temperature range from 298 K to 1773 K to investigate the effects of fission products forming solid solutions in a UO 2 matrix on the thermal expansions. Simulated fuels with an equivalent burn-up of (30 to 120) GWd/tU were used in this study. The linear thermal expansions of the simulated fuel pellets were higher than that of UO 2 , and the difference between these fuel pellets and UO 2 increased monotonically with temperature. For the temperature range from 298 K to 1773 K, the values of the average linear thermal expansion coefficients for UO 2 and simulated fuels with an equivalent burn-up of (30, 60, and 120) GWd/tU are 1.19 × 10

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 85%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Thermal Expansion of Simulated Fuels with Dissolved Fission Products in a UO2 Matrix

Kang

Park

et al. 2009

Int J Thermophys

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“…Existing experimental data of lanthanum chromite perovskite structure, [33][34][35][36][37][38][39][40][41][42][43][44][45] thermodynamics, [30,[33][34][35]43,[46][47][48][49][50][51][52][53] phase stability, [54] and nonstoichiometry [55,56] along with the investigation techniques used are listed in Table 1.…”

Section: The Perovskite Phasementioning

confidence: 99%

Thermodynamic Assessment of the La-Cr-O System

Povoden

Chen

Grundy³

et al. 2008

J. Phase Equilib. Diffus.

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The La-Cr and the La-Cr-O systems are assessed using the Calphad approach. The calculated La-Cr phase diagram as well as LaO 1.5 -CrO 1.5 phase diagrams in pure oxygen, air, and under reducing conditions are presented. Phase equilibria of the La-Cr-O system are calculated at 1273 K as a function of oxygen partial pressure. In the La-Cr system reported solubility of lanthanum in bcc chromium is considered in the modeling. In the La-Cr-O system the Gibbs energy functions of La 2 CrO 6 , La 2 (CrO 4 ) 3 , and perovskite-structured LaCrO 3 are presented, and oxygen solubilities in bcc and fcc metals are modeled. Emphasis is placed on a detailed description of the perovskite phase: the orthorhombic to rhombohedral transformation and the contribution to the Gibbs energy due to a magnetic order-disorder transition are considered in the model. The following standard data of stoichiometric perovskite are calculated: D f;oxides H 298K ðLaCrO 3 Þ = À 73:7 kJ mol À1 , and S 298 K ðLaCrO 3 Þ = 109:2 J mol À1 K À1 . The Gibbs energy of formation from the oxides, D f;oxides GðLaCrO 3 Þ = À 72:403 À 0:0034T (kJ mol 21 ) (1273-2673 K) is calculated. The decomposition of the perovskite phase by the reaction LaCrO 3 ! 1 2 La 2 O 3 + Cr + 3 4 O 2 ðgÞ " is calculated as a function of temperature and oxygen partial pressure: at 1273 K the oxygen partial pressure of the decomposition, p O 2 ðdecompÞ = 10 À20:97 Pa. Cation nonstoichiometry of La 1-x CrO 3 perovskite is described using the compound energy formalism (CEF), and the model is submitted to a defect chemistry analysis. The liquid phase is modeled using the two-sublattice model for ionic liquids.

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