Heat capacity and entropy of monoclinic Gd2O3

Konings, R.J.M.; Miltenburg, J.C. van; Genderen, A.C.G. van

doi:10.1016/j.jct.2005.02.014

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…As can be seen, the present data are 1 -3% higher than that of the recommended values of Pankratz. 22 Konings et al 23 is about 2% higher than that of Konings et al (108.1 J K -1 mol -1 ). 23 3.2.…”

Section: Heat Capacity Of Gd 2 O 3 and Uomentioning

confidence: 65%

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Heat Capacity and Thermal Expansion of Uranium-Gadolinium Mixed Oxides

Krishnan

Panneerselvam

Manikandan

et al. 2009

Journal of Nuclear and Radiochemical Sciences

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Uranium-gadolinium mixed oxides of four different compositions, (U 1-y Gd y) O 2±x (y = 0.1, 0.2, 0.5, and 0.8), were synthesized. Single-phase fluorite structure was observed for the compositions (U 1-y Gd y) O 2±x (y = 0.1, 0.2, and 0.5). The room temperature lattice constants measured for (U 0.9 Gd 0.1) O 2.02 , (U 0.8 Gd 0.2) O 2.00 , and (U 0.5 Gd 0.5) O 1.98 are 0.5463, 0.5454, and 0.5433 nm, respectively. Heat capacity measurements in the temperature range 298-800 K were carried out using a differential scanning calorimetry. Considerable anomalous increases in the heat capacity values were observed for compositions (U 1-y Gd y) O 2±x with y = 0.1, 0.2, and 0.5. The heat capacity values of (U 0.9 Gd 0.1) O 2.02 , (U 0.8 Gd 0.2) O 2.00 , and (U 0.5 Gd 0.5) O 1.98 at 298 K are 63.5, 61.1, and 65.7, respectively. Thermal expansion characteristics of (U 0.9 Gd 0.1) O 2.02 , (U 0.8 Gd 0.2) O 2.00 , and (U 0.5 Gd 0.5) O 1.98 were studied using a high temperature X-ray diffraction in the temperature range 298-1973 K.

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Section: Heat Capacity Of Gd 2 O 3 and Uomentioning

confidence: 65%

“…22 Konings et al 23 is about 2% higher than that of Konings et al (108.1 J K -1 mol -1 ). 23 3.2. Heat capacity of (U 1-y Gd y ) O 2±x .…”

Section: Heat Capacity Of Gd 2 O 3 and Uomentioning

confidence: 65%

Heat Capacity and Thermal Expansion of Uranium-Gadolinium Mixed Oxides

Krishnan

Panneerselvam

Manikandan

et al. 2009

Journal of Nuclear and Radiochemical Sciences

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“…Because of the large aspect ratio of laser spot size to thermal penetration depth, TDTR measures one-dimensional cross-plane thermal conductivity (perpendicular to the surface). In modeling the data, the volumetric heat capacities used for the sample layers were weighted averages (based upon the mol percent of Gd 2 O 3 ) calculated from the known quantities of 2.73 J cm –3 K –1 for HfO 2 , and 2.14 J cm –3 K –1 for Gd 2 O 3 . The samples were assumed fully dense when considering heat capacity estimates as a function of Gd 2 O 3 concentration.…”

Section: Resultsmentioning

confidence: 99%

“…In modeling the data, the volumetric heat capacities used for the sample layers were weighted averages (based upon the mol percent of Gd 2 O 3 ) calculated from the known quantities of 2.73 J cm −3 K −1 for HfO 2 38,39 and 2.14 J cm −3 K −1 for Gd 2 O 3 . 40 The samples were assumed fully dense when considering heat capacity estimates as a function of Gd 2 O 3 concentration. For the samples studied, TDTR data were acquired from five locations on each sample surface.…”

Section: Methodsmentioning

confidence: 99%

Crystal Structure, Phase Analysis, and Thermal Conductivity of Nanocrystalline Gd₂O₃–HfO₂ Coatings

2012

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Gadolinia (Gd 2 O 3 ) doped hafnia (HfO 2 ) nanocrystalline coatings were fabricated employing magnetron sputter-deposition. The coatings were grown onto Si substrates by varying the Gd 2 O 3 composition in the matrix within the range of 0−38 mol % (balanced by HfO 2 ) The crystal structure, phase, morphology, and thermal conductivity of the Gd 2 O 3 −HfO 2 nanocrystalline coatings were evaluated employing X-ray diffraction (XRD), scanning electron microscopy (SEM), and timedomain thermoreflectance (TDTR) techniques. The combined XRD and SEM studies indicate that the effect of Gd 2 O 3 is remarkable on the microstructure evolution of nanocrystalline Gd 2 O 3 −HfO 2 coatings. The grown coatings exhibit stabilized, cubic HfO 2 phase as the Gd 2 O 3 content increased from 4 to 12 mol % at which point the lattice expansion is considerably higher. The morphology of the Gd 2 O 3 −HfO 2 coatings is characterized by the triangular-shaped nanograins uniformly distributed on the surface. The thermal conductivity of all the Gd 2 O 3 -doped HfO 2 samples is lower than pure HfO 2 , and an inverse relationship between Gd 2 O 3 mol percent and heat transport was discovered.

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“…The accuracy in various energy levels can be verified from the measured and calculated Schottky heat capacity. This type of correlation of heat capacity with spectroscopy data is largely studied for compounds like RE2O3 [33][34][35][36][37][38][39][40][41], RE2S3 [42][43][44][45][46][47], RE (OH)3 [48][49][50][51][52] and REPO4 [53][54][55][56][57][58][59][60][61][62][63][64]. …”

Section: Heat Capacity Of Re6uo12(s)(re=la Pr Nd Sm)mentioning

confidence: 99%