Pore-Grain Boundary Interactions and Grain Growth

Brook, R. J.

doi:10.1111/j.1151-2916.1969.tb12664.x

Cited by 333 publications

(130 citation statements)

References 7 publications

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“…However, the peak of the alloyed powder after heat treatment remained broadening and their intensities decreased with heating. It means that the grain growth did not occur through heat treatment because of drag effect [13]. Owing to NiTiO 3 segregation in Ni-doped TiO 2 matrix, grain boundary mobility was controlled by the lattice diffusion of the NiTiO 3 [14,15].On the other hand, simple mixture powders showed the coexistence of NiTiO 3 and rutile TiO 2 phase.…”

Section: Resultsmentioning

confidence: 98%

Synthesis of Novel TiO2 by Mechanical Alloying and Heat Treatment-derived Nanocomposite of TiO2 and NiTiO3

et al. 2006

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Section: Resultsmentioning

confidence: 98%

Synthesis of Novel TiO2 by Mechanical Alloying and Heat Treatment-derived Nanocomposite of TiO2 and NiTiO3

et al. 2006

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“…15,17,18,54,55 A central issue is that the rapidly moving boundary must be able to persistently resist being arrested as it repeatedly encounters pores and adsorbate clouds while consuming matrix grain boundaries.…”

Section: Discussionmentioning

confidence: 99%

Abnormal Grain Growth in Alumina: Synergistic Effects of Yttria and Silica

MacLaren

Cannon

Gülgün

et al. 2003

Journal of the American Ceramic Society

109

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Abnormal grain growth without strong anisotropy or faceting of the grains has been observed in high-purity yttria-doped alumina specimens, often starting at the surface and spreading right through the bulk at higher sintering temperatures. This appears to occur because of an interaction between Si contamination from sintering and the yttria doping; no such effect is seen for undoped samples. Similar microstructures were observed after deliberate Y/Si codoping. Analytical STEM showed that some grain boundaries bordering on large grains contained more Si than Y. HRTEM and diffuse dark-field imaging revealed thin (0.5-0.9 nm) disordered layers at some boundaries bordering large grains. It appears that Si impurities are accumulating at some boundaries and together with the Y inducing a grain boundary structural transformation that accounts for the dramatically increased mobility of these boundaries.

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“…that densification prevails over grain growth), one can obtain (1) is in operation, 2) M b drops with Si-doping; it is observed in our case since activation energy of grain boundary movement increases, 3) c s grows, however, this statement cannot be verified in the frame of our data, 4) c gb drops, and this is reasonable if one assumes segregation of Si. In order to bring together the two phenomena of sinteringdensification and grain growth, the technique of microstructure development maps after Brook [28], Yan [27], and Harmer [29] was applied. Figure 6 illustrates the idea of such a map.…”

Section: Methodsmentioning

confidence: 99%

“…Grain sizes and activation energies for grain growth in different apatite-based materials [20,67,69 Figure 6. Microstructure development map in the G -q space with sintering trajectories corresponding to coarsening and densification + grain growth scenarios (after [27][28][29]) Abbildung 6. Darstellung der Entwicklung der Mikrostruktur im G -q-Raum mit Sintertrajektorien, die Kornvergrößerung und Kornverdichtung+Kornwachstum entsprechen (nach [27-29]) trajectories of HAp and Si-HAp ceramics is shown in Figure 7.…”

Section: Methodsunclassified

Silicon‐substituted hydroxyapatite ceramics (Si‐HAp): densification and grain growth through the prism of sintering theories

Putlayev

Veresov

Pulkin

et al. 2006

Materialwissenschaft Werkst

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Ceramics based on calcium phosphates is known to be a prospective material for biomedical applications. Noticeable attention is paid to hydroxyapatite Ca10(PO4)6(OH)2 (HAp) due to its affinity to a bone mineral. It was recognized recently that Si‐doped HAp is a highly promising material in sense of bioactivity improvement. In the frame of distinct research activity structured around this subject, some special problems are to be solved: (1) solubility of Si in the bulk of HAp lattice (and its limit) vs. segregation of Si to free surfaces and grain boundaries, (2) rationalization of Si effect on sintering of HAp ceramics, (3) charge compensation over aliovalent doping of HAp with Si and its interplay with thermal stability of HAp phase.The work was focused on a fabrication of Si‐HAp with Ca10(Po4)6‐x(SiO4)x(OH)2‐x (x=0..1) nominal composition and evaluation the effect of Si on sintering of HAp ceramics. The limit of Si solubility in HAp lattice was estimated to be not higher than x=0.1 in the formula above (at 1000 °C, according to XRD and SEM/EDX). The essence of the silicon influence consists in significant suppression of grain growth during the initial stage of sintering. Silicon doping reduces grain boundary mobility (increasing activation energy of lattice diffusion) along with the increase of pore mobility (in fact, increasing grain boundary diffusion). We believe that the effect of Si on sintering behaviour can be treated in terms of its segregation to grain boundaries, the phenomenon arising from a lattice instability of Si‐HAp due to the charge compensation in the course of aliovalent doping.

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Pore-Grain Boundary Interactions and Grain Growth

Cited by 333 publications

References 7 publications

Synthesis of Novel TiO2 by Mechanical Alloying and Heat Treatment-derived Nanocomposite of TiO2 and NiTiO3

Synthesis of Novel TiO2 by Mechanical Alloying and Heat Treatment-derived Nanocomposite of TiO2 and NiTiO3

Abnormal Grain Growth in Alumina: Synergistic Effects of Yttria and Silica

Silicon‐substituted hydroxyapatite ceramics (Si‐HAp): densification and grain growth through the prism of sintering theories

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