Low temperature heat capacity of powder and sintered samples of yttria-doped zirconia

Tojo, Takeo; Ataké, Tooru; Shirakami, Tatsuya; Mori, Toshiyuki; Yamamura, Hiroshi

doi:10.1016/0167-2738(96)00097-5

Cited by 12 publications

(9 citation statements)

References 4 publications

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“…It is considered for the hole burning results of YSZ that the disordered nature of ion-arrangement at high temperature, when the conductivity was measured, will be kept at low temperature when the hole spectra were measured. An anomalous behavior in the heat capacity of YSZ at low temperature has been reported by Tojo et al [23]. Their results are consistent with of the results in this work, i.e.…”

Section: Fi"-aluminasupporting

confidence: 94%

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Study on Ion-dynamics in solids by hole burning spectroscopy

Hattori

2003

Ionics

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Abstract. The importance of hole burning spectroscopy for studying elementary migration processes of ions in superionic conductors is being discussed using two examples. In [Y'-alumina, the potential energy for the conduction of ions along the conduction path, as obtained from the analysis of the results of hole burning spectroscopy, showed that there are two different bare-potentials along the ionic conduction path. One of them is higher than the activation energy for ionic conductivity. This result gives direct evidence that an ionic interaction among the conducting ions plays an important role for ion migration in ]Y'-alumina. In YSZ with various concentration of Y203, we have observed persistent holes in Pr ~+ ions doped samples. Their disordered nature will be discussed using the bandwidth considerations.

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Section: Fi"-aluminasupporting

confidence: 94%

“…been considered that this phenomenon will be related to the disordered ion arrangement, including oxygen vacancies, the problem has not been resolved yet perfectly [22,23].…”

Section: Fi"-aluminamentioning

confidence: 99%

Study on Ion-dynamics in solids by hole burning spectroscopy

Hattori

2003

Ionics

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“…Tojo et al 19 reported that the YSZ heat capacity measured using the powder contained an excess heat capacity because water and gases are adsorbed on the YSZ powder surface. Therefore, the YSZ powders were initially fired at 1073 K for 1 h in order to desorb any water and gases adsorbed on the surface of the YSZ powders.…”

Section: Specific Heat Capacitymentioning

confidence: 99%

Effect of the Y₂O₃ Concentration in YSZ on the Thermophysical Property as a Thermal Shielding Material

Sasaki

Terai

Suzuki

et al. 2010

Int J Applied Ceramic Tech

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The effect of the Y 2 O 3 concentration in yttria-stabilized zirconia (YSZ) on the thermophysical property of porous YSZ was studied. The specific heat capacities (C p ), the thermal diffusivity (a), the apparent density (r) of a 3 mol% Y 2 O 3 /97 mol% ZrO 2 (3YSZ), and an 8 mol% Y 2 O 3 /97 mol% ZrO 2 (8YSZ) were measured. The 8YSZ's C p was lower than that of the 3YSZ. When the YSZs were dense, the 3YSZ's a value by a phonon decreased with an increase in the temperature, whereas that of the 8YSZ was almost constant over a wide temperature range. When the YSZs were porous, the 8YSZ's a value by the phonon was greater than that of the 3YSZ's.

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“…The glow occurs so rapidly that quasiadiabatic conditions can be assumed. The heat evolution from surface area loss can be derived from calculated surface energies [41], which approximate the surface enthalpy [42] [43][44][45][46] . Based on these data, the loss of 122 m 2 ·g -1 surface area would result in a temperature rise of 200-443 K, which compares well to the observed overshoots.…”

Section: Events During Thermal Treatmentmentioning

confidence: 99%

Rapid genesis of active phase during calcination of promoted sulfated zirconia catalysts

Hahn

Jentoft

Ressler

et al. 2005

Journal of Catalysis

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Amorphous sulfated zirconium hydroxide was promoted with iron or manganese via the incipient wetness technique, to give 0.5-3.5 weight% promoter in the final catalyst. An exothermic reaction during the calcination temperature ramp (to 823 or 923 K) leads to a rapid overheating ("glow") of the sample. XRD shows that crystallization starts before and progresses during the overheating. The surface area shrinks during the glow, and its final size (85-120 m 2 ·g -1 ) and the porosity appear to be largely determined by the glow event. Manganese and iron ions prevent the coalescence of particles and lead to high surface areas. Variation of the batch volume (2.2, 8.4, or 17.1 ml) for calcination produced different catalysts from the same precursor. For both promoters, samples calcined in large batches exhibited the highest surface areas, interconnected mesopores (2.2-3.8 nm), and the highest maximum rate in n-butane isomerization (338 K, 1 kPa n-butane). Long term performance was independent of surface area and morphology. The concentration of the active sites depended on the calcination batch size, indicating that the active phase is formed in kinetically controlled reactions during the rapid overheating. The catalytic and textural properties of sulfated zirconia catalysts can be reproduced through controlling the batch size used for calcination.

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Low temperature heat capacity of powder and sintered samples of yttria-doped zirconia

Cited by 12 publications

References 4 publications

Study on Ion-dynamics in solids by hole burning spectroscopy

Study on Ion-dynamics in solids by hole burning spectroscopy

Effect of the Y₂O₃ Concentration in YSZ on the Thermophysical Property as a Thermal Shielding Material

Rapid genesis of active phase during calcination of promoted sulfated zirconia catalysts

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Low temperature heat capacity of powder and sintered samples of yttria-doped zirconia

Cited by 12 publications

References 4 publications

Study on Ion-dynamics in solids by hole burning spectroscopy

Study on Ion-dynamics in solids by hole burning spectroscopy

Effect of the Y2O3 Concentration in YSZ on the Thermophysical Property as a Thermal Shielding Material

Rapid genesis of active phase during calcination of promoted sulfated zirconia catalysts

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Product

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Effect of the Y₂O₃ Concentration in YSZ on the Thermophysical Property as a Thermal Shielding Material