Grain-boundary diffusion of oxygen in polycrystalline ferrites

Суржиков, А. П.; Peshev, V. V.; Pritulov, A. M.; Gyngazov, S.A.

doi:10.1007/bf02508222

Cited by 21 publications

(14 citation statements)

References 1 publication

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“…Oxygen diffusion along grain boundaries (GBs) proceeds by a few orders of magnitude faster than that in the bulk [5,6]. This circumstance gives rise to the fact that oxygen concentration in the region of GBs appears to be higher than in the bulk of the grain.…”

Section: Discussion Of Resultsmentioning

confidence: 97%

“…When they capture electrons, the concentration of charge carriers is decreased and a negative surface charge is formed, which causes an increased electrostatic potential at a GB and a formation of an intergrain potential barrier. In [5], it was clearly shown by measuring the static conductance that the value of Е а in Li-Ti-ferrite ceramic is nearly equal to the height of this barrier. Thus, we might suggest that there is a certain correlation between the value of Е а and the content of oxygen in grain interlayers in polycrystalline ferrite.…”

Section: Discussion Of Resultsmentioning

confidence: 97%

“…The appropriateness of this approach was validated in earlier works [3,5]. The value of Е а was determined from the results of processing of the temperature dependences of electrical conductivity measured under continuous current within the temperature Т = 300-550 K, with thin layers being consecutively removed from the specimen surface.…”

Section: Methodsmentioning

confidence: 99%

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Interaction of lithium-titanium ceramics with air during sintering

et al. 2007

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Interaction of lithium-titanium polycrystalline ferrites with ambient air during their sintering is investigated using the methods of electroconductivity and thermal gravimetry within the temperature interval Т = 600-1300 K. It is found out that the temperatures exceeding Т = 1100 K correspond to effective course of reducing reactions in this material, which results in the formation of an oxygen-deficient ceramic structure in the stage of isothermal tempering (Т = 1280 К). It is shown that in the final cooling stage the process of exchange of the ferrite ceramics with the ambient atmosphere exhibits a pronounced oxidative character. The role of these redox processes in the formation of the oxygen non-stoichiometry of the sintered specimen and the depth of its distribution are analyzed.

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Section: Discussion Of Resultsmentioning

confidence: 97%

Section: Discussion Of Resultsmentioning

confidence: 97%

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Interaction of lithium-titanium ceramics with air during sintering

et al. 2007

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“…In [6], it was clearly shown by the measurement of static conductivity that the value of Е a in ferrite ceramic was nearly equal to the height of a grain-boundary potential barrier. We, therefore, believe that the value of Е a in polycrystalline LPF obtained from the measurements of static conductivity would also characterize the barrier potential difference.…”

Section: A-type Ceramicmentioning

confidence: 96%

Investigation of electroconductivity of lithium pentaferrite

et al. 2006

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Using a double-probe spreading resistance measurement technique combined with a layer-by-layer analysis, temperature dependences of electroconductivity of polycrystalline lithium pentaferrite (LPF), which is produced via a ceramic-production technological process, are investigated. It is shown that the electroconductivity activation energy of LPF is controlled by the height of grain-boundary potential barrier due to different degrees of grain boundary and grain bulk oxidation. A relationship is established between the value of the electroconductivity activation energy of LPF and the processes of its oxygen exchange with the surrounding medium during thermal annealing.

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“…Therefore, the variation of the capacitance per unit length indicates change in the wire geometric dimensions or insulation electrical properties. The need to ensure the stability of the electrical and geometrical parameters of the entire length of the cable products requires continuous in-process control of these parameters [1][2][3][4][5]. A continuous capacitance control can solve this problem.…”

Section: Introductionmentioning

confidence: 99%

Capacitance Control on the Wire Production Line

2016

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Abstract. The paper presents technical implementation of the electricalcapacitive method to perform in-process measurement of the capacitance per unit length of a single-core electric wire. The design of the electrocapacitive measuring transducer is proposed. The block diagram of the device CAP-10 developed to implement the proposed method is presented. The appearance of the device CAP-10 is showed, and its operating principle is described. It is shown that the change in water conductivity has a significant impact of the measurement result of the wire capacitance per unit length. The techniques to offset from the impact of water conductivity variation on measurement results are proposed. The technique of the device CAP-10 initial adjustment is proposed. It provides the desired function of the output signal transformation. The technique of the "operating" adjustment to correct measurement results through systematic measurement error elimination is offered.

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Grain-boundary diffusion of oxygen in polycrystalline ferrites

Cited by 21 publications

References 1 publication

Interaction of lithium-titanium ceramics with air during sintering

Interaction of lithium-titanium ceramics with air during sintering

Investigation of electroconductivity of lithium pentaferrite

Capacitance Control on the Wire Production Line

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