Lattice thermal expansion of the solid solutions (La1−xSmx)2Ce2O7

Wu, Hongdan; Lei, Xinrong; Zhang, Jinhua; Yu, Jishun; Zhang, Suxin

doi:10.1016/j.materresbull.2014.06.016

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…For common substitution doping, the entropy of the zirconia solid solution with homogenous chemical composition increases with the dopant content. If cation mixing is non‐ideal and atoms are not randomly distributed on each sublattice, showing either second phase, clustering or short‐range cation ordering which change local and bulk symmetries, stabilizing the structure in enthalpy but diminishing the partial entropy (∂S) 16,44–46 . The TEM and SAED patterns of Figures 6 and 7 are the evidences for the uneven chemical composition and crystalline phase of the specimens.…”

Section: Discussionmentioning

confidence: 95%

“…To the best of our knowledge, this is the first study to ever report the dilute Fe 2 O 3 ‐Y 2 O 3 ‐ZrO 2 solid solutions show a remarkable drop in specific heat capacity with temperature and composition. The specific heat capacity ( C p ) of non‐magnetic and insulating materials is approximated as C p = T ·(∂ S /∂ T ) p , 6,39,40,44–46 implying the C p variation also reflects entropy change (Δ S ) determined on phonons vibration in thermodynamic. For common substitution doping, the entropy of the zirconia solid solution with homogenous chemical composition increases with the dopant content.…”

Section: Discussionmentioning

confidence: 99%

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Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

et al. 2021

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Multi‐element doped zirconia ceramics are of interest as a satisfactory balance in low thermal conductivity, phase stability, and particularly fracture resistance dominated by non‐transformable tetragonal prime phase (t′) for the next generation thermal barrier coatings and catalysis supports. Compared with mass and radius of dopants, dopant location is rarely investigated due to the high complexity. The undersized transition metal oxides (Fe, Co, and Ni) within 2.0 mol% content were selected for doping 3Y‐TZP to improve thermophysical properties by distinctive doping locations. As shown by X‐ray diffraction and Raman spectra, the Fe3+/Fe2+ ions occupied both substitution and interstitial sites simultaneously, which significantly increased tetragonality and local anisotropy of FeY‐TZP polycrystal. The t′ phase transformation mechanism of the FeY‐TZP compounds quantitatively discussed regarding the coercive strain and stress. In opposition to prediction by Kopp's law, the coefficient of thermal expansion and specific heat capacity of the FeY‐TZP compounds unusally decreased, and the maximum reduction of −83% and −22.5% occured in the 1.0 mol% Fe doping. Cp‐T dependency of the specimens above 550 K strongly related with lattice anisotropy in addition to t′ phase content. Thermomechanical properties of the multicomponent zirconia are highly tunable with dopant locations, supplying a novel landscape for designing high‐entropy ceramics.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

et al. 2021

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“…The lattice parameters and space groups of the synthesized La 0.7 Sr 0.3 Mn 0.9 X 0.1 O 3 were determined by Rietveld refinement. All diffraction peaks assigned to the crystalline phase were indexed in a trigonal unit cell [space group R-3C ( 167)], and the lattice parameters are listed in Table 2 (Petrov et al, 1999;Troyanchuk et al, 2015;Mostafa et al, 2008;El-Fadli et al, 2002;Yanchevskii et al, 2006;Reshmi et al, 2013;Paiva-Santos et al, 2002;Wu et al, 2014). As seen in the XRD pattern of the nonsubstituted LSM (Figure 1A), a series of peaks (blue vertical bars) correspond to the crystalline phase (red vertical bars below the XRD pattern), as cited in (Petrov et al, 1999).…”

Section: Resultsmentioning

confidence: 99%

Two-Step Thermochemical CO2 Splitting Using Partially-Substituted Perovskite Oxides of La0.7Sr0.3Mn0.9X0.1O3 for Solar Fuel Production

Sawaguri

Gokon²,

Hayashi³

et al. 2022

Front. Energy Res.

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We investigated, herein, the redox activity of partial substitution of the B-site in a series of lanthanum/strontium-manganese-based (LSM) perovskite oxide, La0.7Sr0.3Mn0.9X0.1O3 for solar two-step thermochemical fuel production using concentrated solar radiation as an energy source. We systematically investigated the effects of partial substitution in LaSrMnO3 in terms of their kinetics behavior, oxygen/CO productivity, thermal reduction/oxidation temperatures. Furthermore, repeatability was evaluated and compared among the samples prepared using the same procedure and studied using the same test method. We observed and evaluated the long-term thermal stability of the redox activity and valence variation of the constituting ionic species of the perovskite in the two-step thermochemical CO2 splitting. From the perspectives of superior activity and long-term repeatability, Ni-, Co-, and Mg-substituted LSM perovskites are promising for thermochemical two-step CO2/H2O splitting to produce synthetic gas.

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“…Generally, the macro thermal expansion of bulk ceramics origins from the micro lattice thermal expansion. Based on Ref, potential energy can be applied to explain the thermal expansion performance of TiO 2 alloying Sm 3 TaO 7 ceramics as the asymmetric anharmonic vibration of Ta–O and Sm–O bond is the major factor. Compared with Ta–O bond (1.93‐2.03 Å), the bond length Sm–O bond (2.15‐2.55 Å) is longer due to the longer ionic radius of Sm 3+ as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Optimization thermophysical properties of TiO₂ alloying Sm₃TaO₇ ceramics as promising thermal barrier coatings

Lin

Feng

2018

Int J Applied Ceramic Tech

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TiO2 alloying effect is applied to optimize the thermophysical properties of fluorite‐type Sm3TaO7 ceramics synthesized via solid‐state reaction, and the influence of TiO2 alloying effect on the optical properties and elastic modulus is determined. According to the decreasing unit cell volume calculated by the X‐ray diffraction and the broadening Raman peak, Ti4+ substitutes the same number of Sm3+ and Ta5+ ions of Sm3TaO7 ceramics at the same time. As Ti4+ substitutes Sm3+ and Ta5+ ions, the band gap of TiO2‐Sm3TaO7 ceramics decreases from 4.71 to 4.11 eV. The phase transition of Sm3TaO7 ceramics is eliminated by TiO2 alloying effect and the coefficient of thermal expansion is increased. Via TiO2 alloying effect, two different phonon scattering mechanisms: (a) the misfit of atomic weight and ionic radius among Ti4+, Sm3+, and Ta5+ ions; (b) the rattling Ti4+ ions are introduced in Sm3TaO7 ceramics. The lowest thermal conductivity of TiO2‐Sm3TaO7 ceramics reaches 1.37 W K−1 m−1 (800°C, 9 mol% TiO2‐Sm3TaO7), which is much lower than 7YSZ and Sm2Zr2O7 ceramics. Accordingly, it is believed that TiO2‐Sm3TaO7 ceramics are promising thermal barrier coatings.

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Lattice thermal expansion of the solid solutions (La1−xSmx)2Ce2O7

Cited by 10 publications

References 21 publications

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

Two-Step Thermochemical CO2 Splitting Using Partially-Substituted Perovskite Oxides of La0.7Sr0.3Mn0.9X0.1O3 for Solar Fuel Production

Optimization thermophysical properties of TiO₂ alloying Sm₃TaO₇ ceramics as promising thermal barrier coatings

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Lattice thermal expansion of the solid solutions (La1−xSmx)2Ce2O7

Cited by 10 publications

References 21 publications

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe2O3‐Y2O3‐ZrO2 solid solutions

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe2O3‐Y2O3‐ZrO2 solid solutions

Two-Step Thermochemical CO2 Splitting Using Partially-Substituted Perovskite Oxides of La0.7Sr0.3Mn0.9X0.1O3 for Solar Fuel Production

Optimization thermophysical properties of TiO2 alloying Sm3TaO7 ceramics as promising thermal barrier coatings

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Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

Optimization thermophysical properties of TiO₂ alloying Sm₃TaO₇ ceramics as promising thermal barrier coatings