Characterisation of the SOFC material, LaCrO3, using vibrational spectroscopy

Tompsett, Geoff A.; Sammes, Nigel M.

doi:10.1016/j.jpowsour.2003.11.057

Cited by 40 publications

(31 citation statements)

References 19 publications

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“…LaCrO 3 has been found to be highly conductive at high temperature, which would be useful in fuel cells. 11,12 As one of the typical RECrO 3 compounds, NdCrO 3 crystallizes in an orthorhombic structure with space group Pnma. The Nd 3+ ions are located in the spaces between CrO 6 octahedra.…”

Section: Introductionmentioning

confidence: 99%

Structure, magnetic, and thermal properties of Nd1−xLaxCrO3 (≤x≤1.0)

Cheng

Wang

et al. 2010

Journal of Applied Physics

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Perovskite-type Nd 1−x La x CrO 3 (0 ≤ x ≤1.0) polycrystalline samples were synthesized using solid state reaction. Structural studies indicate that the lattice parameters, metal-oxygen bond lengths, and angles of Nd 1−x La x CrO 3 strongly depend on the La content. Two magnetic transition temperatures, Cr 3+ antiferromagnetic ordering temperature (T N ) and the spin reorientation phase transition temperature (T SRPT ), have been observed in the M-T curves. The increase in T N and decrease in T SRPT with increasing x value can be explained by the change in the magnetic interactions due to La doping. The heat capacity of Nd 1−x La x CrO 3 measured from 2 to 300 K reveals that the lattice, electronic, and magnetic contributions to heat capacity can be well interpreted quantitatively using the Debye and Schottky models. The splitting energy of the Cr 3 + 3dt 2g orbital and the Nd 3+ ground state have been calculated by fitting to the Schottky anomaly at very low temperature. The Cr-Nd interaction is suppressed gradually by La doping, which is verified by the calculation of the mean-field interaction parameter. This doping dependence provides directed evidence of TM-RE magnetic interactions in perovskite compounds, in agreement with the proposed model. Perovskite-type Nd 1−x La x CrO 3 ͑0 Յ x Յ 1.0͒ polycrystalline samples were synthesized using solid state reaction. Structural studies indicate that the lattice parameters, metal-oxygen bond lengths, and angles of Nd 1−x La x CrO 3 strongly depend on the La content. Two magnetic transition temperatures, Cr 3+ antiferromagnetic ordering temperature ͑T N ͒ and the spin reorientation phase transition temperature ͑T SRPT ͒, have been observed in the M-T curves. The increase in T N and decrease in T SRPT with increasing x value can be explained by the change in the magnetic interactions due to La doping. The heat capacity of Nd 1−x La x CrO 3 measured from 2 to 300 K reveals that the lattice, electronic, and magnetic contributions to heat capacity can be well interpreted quantitatively using the Debye and Schottky models. The splitting energy of the Cr 3+ 3dt 2g orbital and the Nd 3+ ground state have been calculated by fitting to the Schottky anomaly at very low temperature. The Cr-Nd interaction is suppressed gradually by La doping, which is verified by the calculation of the mean-field interaction parameter. This doping dependence provides directed evidence of TM -RE magnetic interactions in perovskite compounds, in agreement with the proposed model.

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Section: Introductionmentioning

confidence: 99%

Structure, magnetic, and thermal properties of Nd1−xLaxCrO3 (≤x≤1.0)

Cheng

Wang

et al. 2010

Journal of Applied Physics

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“…Furthermore, the vibrational mode assignment of the absorption bands which is made on the basis of relative infrared spectral profiles and the band positions of the fully characterized earlier reported SmAlO 3 are listed in Table 3 [13]. In addition, experimentally observed and lattice dynamic calculated (LDC) modes of orthorhombic LaMnO 3 [14][15][16][17], compared with observed modes of orthorhombic LaCrO 3 [3,4,15,16,18,19] are also listed in Table 3. It can be noticed that the absorption band positions obtained from La 1−X−Y Sm X Sr Y CrO 3 ; 0.1 ≤ X and/or Y ≤ 0.3 almost match closely in nature and are similar with those reported for SmAlO 3 [13], LaMnO 3 [14][15][16][17], and LaCrO 3 [3,4,15,16,18,19].…”

Section: Fourier Transform Infrared (Ft-ir) Spectroscopic Analysesmentioning

confidence: 99%

“…They are also of interest for electrode applications in magneto-hydrodynamic (MHD) generator channels and as heating elements in high temperature furnace [3,4]. Furthermore, LaCrO 3 -based oxide was shown to have catalytic activity for methane oxidation [5].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, LaCrO 3 -based oxide was shown to have catalytic activity for methane oxidation [5]. Pure LaCrO 3 exhibits orthorhombic symmetry at room temperature and transforms to rhombohedral symmetry at 255 • C [3]. However, the doping of a metal cation in La-and/or Crsites of LaCrO 3 arrests the structures' transformation depending on the conditions of preparation [4][5][6]1,2,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, several workers [3,4] have reported the infrared spectra of rare earth ortho-chromites, but unfortunately some bands were not assigned. Band positions observed for LaCrO 3 are as follows: 325, 343, 372, 425, 580, 630, 640 and 675 cm −1 .…”

Section: Introductionmentioning

confidence: 99%

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