Point defects and high-temperature creep of non-stoichiometric NaCl-type oxide single crystals II. CoO

Domínguez‐Rodríguez, Arturo; Sánchez, M.L.; Márquez, R.; Castaing, J.; Monty, C.; Philibert, J.

doi:10.1080/01418618208239568

Cited by 30 publications

(10 citation statements)

References 10 publications

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“…4 Co i ] 3À [23]. Figure 5 The results of the creep studies of CoO single crystals [24][25][26][27][28] and CoO polycrystals [14] are summarized in Table 1. A comparison of the activation energies for creep rate with oxygen self-diffusion obtained by Dubois et al [15,16] agrees only with a rather large uncertainty.…”

Section: Creep Of Coomentioning

confidence: 99%

“…This defect is similar to an element of the spinel structure of magnetite Fe 3 O 4 . Therefore, the Roth complexes can be formally considered as a magnetite-type defect or a submicrodomain of Fe 3 O 4 in FeO [28,31]. On the basis of X-ray studies, Koch and Cohen [32] have postulated that defects in Fe 1Ày O form associates even larger than Roth 2:1 complexes, composed of 13 iron vacancies and 4 interstitials (termed as cluster 13:4).…”

Section: Creep Of Feomentioning

confidence: 99%

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High Temperature Creep of Metal Oxides

Schneider¹,

Rękas²

2018

Creep

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This chapter presents a comprehensive review of the creep technique used for the study of defect structure and diffusion in metal oxides, both single crystals and ceramics. At high temperatures, the creep rate is proportional to the diffusion coefficient of the slowest species in solid compounds, whatever deformation mechanisms are present (Nabarro viscous creep, recovery creep or pure climb creep). The creep rate dependence on deviation from stoichiometry can be determined from this diffusion. In the case of metal oxides, the departure from stoichiometry is controlled by the oxygen activity which usually is identified with oxygen partial pressure, p O 2 . The p O 2 dependence of the creep rate provides direct information about the nature of minority point defects. On the other hand, studies of the temperature dependency of the creep rate inform us about the activation energy of the diffusion coefficient.This review focuses primarily on the creep behavior of transition metal oxides such as Ni 1Ày O, Co 1Ày O, Fe 1Ày O exhibiting disorder in metal sublattice, as well as ZrO 2Àx with majority defects in oxygen sublattice. The advantage of these studies is determination of both defect structure and diffusion coefficients of minority defects namely in oxygen sublattice in iron-triad oxides and in zirconium ZrO 2 sublattice.

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Section: Creep Of Coomentioning

confidence: 99%

Section: Creep Of Feomentioning

confidence: 99%

High Temperature Creep of Metal Oxides

Schneider¹,

Rękas²

2018

Creep

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“…This is about a factor of two higher than the CRSS extrapolated to 0 K, but should be considered to be in satisfactory agreement in terms of the computing techniques of the time. 9.4.1.2 Transition Metal Oxides and the Effect of Stoichiometry Plastic deformation of single crystals of the transition metal oxides M 1-x O with the rock-salt structure has been studied for M ¼ Mn [43], Fe [44], Co [45][46][47][48], and Ni [49,50]. The maximum value of x varies from 0.001 for Ni and 0.013 for Co to 0.15 for Fe and Mn.…”

Section: Dislocations In Particular Oxidesmentioning

confidence: 99%

“…Dominguez-Rodriguez et al [45] also analyzed creep data at temperatures from 1000 to 1450 C using Eq. (7), and found that Q increased from 2.5 eV at low temperatures and high p O2 to 5 eV at high temperatures and high p O2 .…”

Section: Neutral Oxygen Vacancymentioning

confidence: 99%

Dislocations in Ceramics

Mitchell¹

2010

Ceramics Science and Technology

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“…Z .1 CREEP MEASUREMENTS. 2013 Creeps tests have been performed on Cu20 and CoO, single and polycrystals according to experimental techniques already used in previous works [ 10,11 ]. We have restricted our experiments to the following conditions :…”

Section: Introductiorlmentioning

confidence: 99%

Chemical diffusion for CoO and Cu2O deduced from creep transitories

Clauss¹,

Domínguez‐Rodríguez²,

Castaing³

1986

Rev. Phys. Appl. (Paris)

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2014 A la suite d'un changement de pression d'oxygène, l'analyse du fluage transitoire nous a permis de déterminer un coefficient de diffusion chimique pour les monocristaux et polycristaux de CoO et Cu2O. Le retour à l'équilibre de la concentration des défauts ponctuels se fait au même rythme pour tous les défauts concernés. Les joints de grains n'accélèrent pas ce processus de façon sensible. Abstract. 2014 The analysis of creep transitories after a change in oxygen partial pressure, allowed us to determine chemical diffusion coefficients for CoO and Cu2O, single-and polycrystals. The rate of equilibration of point defect concentrations is similar for all defects. Grain boundaries do not seem to accelerate the process.

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Point defects and high-temperature creep of non-stoichiometric NaCl-type oxide single crystals II. CoO

Cited by 30 publications

References 10 publications

High Temperature Creep of Metal Oxides

High Temperature Creep of Metal Oxides

Dislocations in Ceramics

Chemical diffusion for CoO and Cu2O deduced from creep transitories

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