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Mori, M.; Yamamoto, Tohru; Itoh, Hibiki; Watanabe, Takao

doi:10.1023/a:1018565409603

Cited by 83 publications

(42 citation statements)

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“…There are two different formulas to describe the variation of the electrical conductivity with the relative content of Cr 4 where e is the elementary electric charge, a 0 is the minimum distance between the Cr ions, n 0 is the hopping frequency t 0 1an 0 , k is the Boltzmann constant, E a is the activation energy, T is the absolute temperature, [Cr 3 ] and [Cr 4 ] are the relative contents of Cr 3 and Cr 4 ions, respectively [4,5]. Obviously, according to formula (1), a plot of the electrical conductivity versus the relative content of Cr 4 ions will be linear at constant temperature if other parameters are approximately constant.…”

Section: Resultsmentioning

confidence: 99%

“…We have noted that there are different experimental results on the variation of the electrical conductivity of Ca-doped lanthanum chromite with Ca content. For example, some reports give a linear variation of the electrical conductivity with Ca content in air at 1000 C [6], whereas in some reports the variation of the electrical conductivity of the same samples with Ca content shows a nonlinear relationship in air at 1000 C [5]. These experimental results are considered reliable.…”

Section: Introductionmentioning

confidence: 89%

“…In Fig. 2, the electrical conductivity of La 0X7 Ca 0X3 CrO 3 is 45.7 S cm À1 in air at 1000 C [5]. From curve a in Fig.…”

mentioning

confidence: 85%

“…The conduction mechanism in lanthanum chromite is considered to have involved the Cr 4 ion [4]. Two different formulas have been suggested to describe the relationship between the electrical conductivity and the relative content of Cr 3 or Cr 4 ions in doped lanthanum chromite [4,5]. We have noted that there are different experimental results on the variation of the electrical conductivity of Ca-doped lanthanum chromite with Ca content.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the lanthanum chromites reported are synthesized by a solid state reaction at a high temperature above 1000 C [5]. The oxygen deficiency in the compound will easily occur due to the evaporation of CrO 3 [16].…”

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confidence: 99%

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Valence State of the Chromium Ion and Electrical Conductivity of Ca-Doped Lanthanum Chromite

Zhang

Jia

1999

phys. stat. sol. (b)

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The valence state of the Cr ion in Ca‐doped lanthanum chromite compounds without or with oxygen deficiency has been calculated by means of a tight‐binding approximation on the basis of the EHMO approximation. The results indicate that the relative content of Cr4+ ions in La1—xCaxCrO3 will become larger with increasing x and the electrical conductivity is in proportion with the relative content of Cr4+ ions in the compound. The difference between some reported experimental results in the same compounds is mainly due to the different oxygen deficiency in the samples. Doping can lead not only to a splitting of the t2g and eg subbands from the Cr atom and a narrowing of the gap between the t2g subband from the Cr atom and 2p band from the O atom, but also leads to an increase of the relative content of the acceptor of Cr4+ ions and to an increasing number of holes in the band. A linear relationship between the elecrtrical conductivity and the relative Cr4+ ion content may be valid only for lanthanum chromite with a small amount of Ca.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

“…In Fig. 2, the electrical conductivity of La 0X7 Ca 0X3 CrO 3 is 45.7 S cm À1 in air at 1000 C [5]. From curve a in Fig.…”

mentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Valence State of the Chromium Ion and Electrical Conductivity of Ca-Doped Lanthanum Chromite

Zhang

Jia

1999

phys. stat. sol. (b)

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M�ssbauer Spectra of57Fe in La0.75M0.25Cr0.75Fe0.25O3 (M = Ca, Sr, Ba)

Zhang

Yang

Xiong

et al. 2000

phys. stat. sol. (b)

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Study of the behavior of ephemeral waves in gas-liquid two-phase flow: I. Determination of sub-wave-veins

Mori

Kondo

Matsumoto

et al. 2001

Heat Trans. Asian Res.

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Time-spatial measurements of liquid holdup distributions along the axis of a tube were carried out over the length of 1325 mm in upward gas-liquid two-phase flow. In order to clarify the characteristics of the behavior of ephemeral waves, a method of determining sub-wave-veins, that is, the traces of ephemeral waves on the time-spatial behavior charts of the interface, was developed. This method was applied to the flow conditions in huge wave flow and annular flow regimes, and the sub-waveveins in these flow regimes were successfully determined. Time-spatial behavior charts of the interface with determined sub-wave-veins were systematically presented and the characteristics of sub-wave-veins were discussed. Close inspection of the behavior of sub-wave-veins reveals that there are two types of ephemeral waves: one has a shorter life span and the other has a longer life span during which absorption and discharge of small ephemeral waves occurs. © 2001 Scripta Technica, Heat Trans Asian Res, 30(2): [114][115][116][117][118][119][120][121][122][123][124][125] 2001

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Cited by 83 publications

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Valence State of the Chromium Ion and Electrical Conductivity of Ca-Doped Lanthanum Chromite

Valence State of the Chromium Ion and Electrical Conductivity of Ca-Doped Lanthanum Chromite

M�ssbauer Spectra of57Fe in La0.75M0.25Cr0.75Fe0.25O3 (M = Ca, Sr, Ba)

Study of the behavior of ephemeral waves in gas-liquid two-phase flow: I. Determination of sub-wave-veins

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