Microstructural evolution during sintering of TiO2/SiO2-doped alumina: mechanism of anisotropic abnormal grain growth

Kwon, Ohsang; Hong, Seong‐Hyeon; Lee, J.-H.; Chung, Ui-Jin; Kim, D.-Y.; Hwang, Nong M.

doi:10.1016/s1359-6454(02)00355-5

Cited by 58 publications

(29 citation statements)

References 23 publications

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“…Similarly, the low melting temperature of the Nb-rich, Ba-poor phase at the GBs caused localized liquid-phase sintering, resulting in abnormal grain growth in the strontium barium niobate Sr 0.6 Ba 0.4 Nb 2 O 6 ceramics or lead zirconate titanate [166,167]. Accumulation of impurities in GBs also leads to the formation of GB liquid films and to increase of mobility of certain GBs [160,[168][169][170]. In this review, it is interesting for us to investigate how the GB faceting-roughening influences the transition from normal to abnormal grain growth.…”

Section: Faceting-roughening Of Low-angle Grain Boundariesmentioning

confidence: 99%

“…In this review, it is interesting for us to investigate how the GB faceting-roughening influences the transition from normal to abnormal grain growth. Even if this transition is due to the impurity accumulation and formation of layers of GB phase (complexions or liquid films), the GBs frequently possess the large flat facets [165,[167][168][169][170][171][172]. GB faceting-roughening is the intrinsic driving force for the transition from normal to abnormal grain growth even in the absence of other reason like impurity or Zener drag.…”

Section: Faceting-roughening Of Low-angle Grain Boundariesmentioning

confidence: 99%

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Review: grain boundary faceting–roughening phenomena

et al. 2015

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Similar to free surfaces, the grain boundaries (GBs) in metals, semiconductors and insulators can contain flat (faceted) and curved (rough) portions. In the majority of cases, facets are parallel to the most densely packed planes of coincidence sites lattice formed by two lattices of abutting grains. Facets disappear with the increasing temperature (faceting-roughening transition) and the increasing angular distance from coincidence misorientation. The temperature of GB faceting-roughening transition T R decreases with the increasing inverse density of coincidence sites R. In case of fixed R, T R decreases with the decreasing density of coincidence sites in the GB plane.The intersection line (ridge) between facets or between facets and curved (rough) portions of surfaces can be of first order (two different tangents in the contact point) or of second order (common tangent, continuous transitions). The rough (curved) portions of GB can also form the firstorder rough-to-rough ridges (with two tangents). GB facets control the transition from normal to abnormal grain growth and strongly influence the GB migration, diffusion, wetting, fracture and electrical conductivity.

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Section: Faceting-roughening Of Low-angle Grain Boundariesmentioning

confidence: 99%

Section: Faceting-roughening Of Low-angle Grain Boundariesmentioning

confidence: 99%

Review: grain boundary faceting–roughening phenomena

et al. 2015

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“…During the sintering of oxide crystalline ceramics with an atomically flat interface structure, the presence of an intergranular liquid, whether its precursor materials are added intentionally or incorporated during the processing, is known to promote abnormal grain growth by enhanced mass transfer [29][30][31][32][33][34]. According to the literature, an increase in liquid content decreases the abnormal particle size, as a result of more active and frequent nucleation of abnormal grains and their earlier impingement with each other after abnormal grain growth [30,33].…”

Section: Article In Pressmentioning

confidence: 99%

Growth mechanism of In(OH)3 nanocubes during hydrothermal reaction

Kim

Lee

Kim

et al. 2008

Journal of Crystal Growth

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“…16 In the Kwon et al experiments, the appearance of the liquid phase (IGF) was thought to increase the boundary mobility and AGG is explained as a result of the enhanced growth on the nonbasal plane due to the re-entrant edges formed at the grain boundaries. 17 Experiments also show that significant segregation of Ca and other cations at the alumina grain boundaries happens while such impurities are still below the solid solution limits in the grains. 9 The segregation of calcium is anisotropic for different orientations of alumina.…”

Section: Introductionmentioning

confidence: 96%

Molecular Dynamics Simulations of the Effect of the Composition of Calcium Alumino-Silicate Intergranular Films on Alumina Grain Growth

Zhang

Garofalini

2006

J. Phys. Chem. B

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Molecular dynamics simulations were performed to study the effect of the composition of the intergranular film (IGF) on anisotropic and isotropic grain growth in R-Al 2 O 3 . In the simulations, the IGF is formed while in contact with two differently oriented alumina crystals, with the alumina (0001) basal plane on one side and the (112 h0) prism plane on the other. Five different compositions in the IGFs were studied. Results show preferential growth along the [112 h0] of the (112 h0) surface in comparison to growth along the [0001] direction on the (0001) surface for compositions near a Ca/Al ratio of 0.5. Such preferential growth is consistent with anisotropic grain growth in alumina, where platelets form because of faster growth of the prism orientations than the basal orientation. The simulations also show the mechanism by which Ca ions in the IGF inhibit growth on the basal surface. At compositions with high or low Ca/Al ratios, growth along each surface normal is equivalent, indicating isotropic grain growth, although the attachment rates are quite different, which may indicate differences between normal grain growth and abnormal, but isotropic, grain growth. The simulations provide an atomistic view of attachment onto crystal surfaces, affecting grain growth in alumina.

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Microstructural evolution during sintering of TiO2/SiO2-doped alumina: mechanism of anisotropic abnormal grain growth

Cited by 58 publications

References 23 publications

Review: grain boundary faceting–roughening phenomena

Review: grain boundary faceting–roughening phenomena

Growth mechanism of In(OH)3 nanocubes during hydrothermal reaction

Molecular Dynamics Simulations of the Effect of the Composition of Calcium Alumino-Silicate Intergranular Films on Alumina Grain Growth

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