Effect of a Liquid Phase on the Morphology of Grain Growth in Alumina

Kaysser, W. A.; Sprissler, Marianne; Handwerker, Carol A.; Blendell, John E.

doi:10.1111/j.1151-2916.1987.tb05005.x

Cited by 190 publications

(94 citation statements)

References 11 publications

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“…These observations appear to contradict findings of Kaysser et al [4]. In their work, sapphire spheres growing into a MgO-doped, glass-free, polycrystalline alumina did not undergo facetting.…”

Section: Kinetics Of Seed Growthcontrasting

confidence: 74%

“…The work focussed on identifying the effect of MgO on grain growth rates; anisotropy of seed growth was not a primary concern. More recent work utilizing this approach has focussed on the effects of an intentionally incorporated liquid phase on the growth rate and morphology of the seed crystal [4,5]. The second approach has focussed on measuring the growth characteristics of the average grain in a polycrystalline matrix.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy of Grain Growth in Alumina

Rödel

Glaeser

1990

Journal of the American Ceramic Society

115

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Grain growth in theoretically dense undoped and MgO‐doped polycrystalline Al2O3 was studied, and average grain‐boundary migration rates were compared with those of a‐plane and c‐plane sapphire during migration into the same undoped and MgO‐doped materials. The results are discussed in terms of a grain‐size‐dependent grain‐boundary mobility‐grain‐boundary energy product, Mbγb. The grainsize dependencies of the Mbγb products for seed and matrix grains differ. Seed orientation appears to affect the nature of solute‐boundary interactions. The importance of grain‐boundary structure on migration characteristics is also indicated by a demonstration of twin‐formation‐enhanced grain growth.

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Section: Kinetics Of Seed Growthcontrasting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Anisotropy of Grain Growth in Alumina

Rödel

Glaeser

1990

Journal of the American Ceramic Society

115

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“…19) as well as the morphologies of the bulk phases. 149,150 Many studies have pointed out that the amount and composition of the sintering aids influence the microstructure evolution during sintering, [151][152][153][154] thereby affecting the chemical and physical properties of the final microstructures. The actual interfacial features also strongly influence mechanical and physical properties, 155 e.g., creep resistance 156,157 or fracture toughness 158 -162 of Si 3 N 4 -or SiC-based materials, or the electrical properties in thick-film resistors, 163 varistors, 164 or high-T c superconductors.…”

Section: (7) Equilibrium Intergranular and Surficial Filmsmentioning

confidence: 99%

Origins and Applications of London Dispersion Forces and Hamaker Constants in Ceramics

French

2000

Journal of the American Ceramic Society

263

100

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The London dispersion forces, along with the Debye and Keesom forces, constitute the long-range van der Waals forces. London's and Hamaker's work on the point-to-point dispersion interaction and Lifshitz's development of the continuum theory of dispersion are the foundations of our understanding of dispersion forces. Dispersion forces are present for all materials and are intrinsically related to the optical properties and the underlying interband electronic structures of materials. The force law scaling constant of the dispersion force, known as the Hamaker constant, can be determined from spectral or parametric optical properties of materials, combined with knowledge of the configuration of the materials. With recent access to new experimental and ab initio tools for determination of optical properties of materials, dispersion force research has new opportunities for detailed studies. Opportunities include development of improved index approximations and parametric representations of the optical properties for estimation of Hamaker constants. Expanded databases of London dispersion spectra of materials will permit accurate estimation of both nonretarded and retarded dispersion forces in complex configurations. Development of solutions for generalized multilayer configurations of materials are needed for the treatment of more-complex problems, such as graded interfaces. Dispersion forces can play a critical role in materials applications. Typically, they are a component with other forces in a force balance, and it is this balance that dictates the resulting behavior. The ubiquitous nature of the London dispersion forces makes them a factor in a wide spectrum of problems; they have been in evidence since the pioneering work of Young and Laplace on wetting, contact angles, and surface energies. Additional applications include the interparticle forces that can be measured by direct techniques, such as atomic force microscopy. London dispersion forces are important in both adhesion and in sintering, where the detailed shape at the crack tip and at the sintering neck can be controlled by the dispersion forces. Dispersion forces have an important role in the properties of numerous ceramics that contain intergranular films, and here the opportunity exists for the development of an integrated understanding of intergranular films that encompasses dispersion forces, segregation, multilayer adsorption, and structure. The intrinsic length scale at which there is a transition from the continuum perspective (dispersion forces) to the atomistic perspective (encompassing interatomic bonds) is critical in many materials problems, and the relationship of dispersion forces and intergranular films may represent an important opportunity to probe this topic. Am. Ceram. Soc., 83 [9] 2117-46 (2000 Centennial FeatureThe London dispersion force is retarded at large separations, where the transit time of the electromagnetic interaction must be considered explicitly. Novel phenomena, such as equilibrium surficial films and bimodal wettin...

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“…Abnormal/discontinuous grain growth can result from nonuniformities in impurity content, inhomogeneous packing of the starting powders, anisotropies in grain boundary energy, and mobility and the presence of a liquid phase along the grain boundaries (13,14). In most materials abnormal/discontinuous grain growth is associated with the presence of a liquid phase along the grain boundaries (12)(13)(14)(27)(28)(29). This can be most likely ruled out for our case because the DTA results (figure 3) revealed no liquid phase (no sharp endothermic peak) at the sintering/hotpressing temperature.…”

Section: Microstructurementioning

confidence: 99%

Hot-Pressed Versus Sintered LiTi2(PO4)3

Wolfenstine¹,

Allen²,

Sumner³

2009

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Sensors and Electron Devices Directorate, ARLApproved for public release; distribution unlimited. Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. ii REPORT DOCUMENTATION PAGE

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Effect of a Liquid Phase on the Morphology of Grain Growth in Alumina

Cited by 190 publications

References 11 publications

Anisotropy of Grain Growth in Alumina

Anisotropy of Grain Growth in Alumina

Origins and Applications of London Dispersion Forces and Hamaker Constants in Ceramics

Hot-Pressed Versus Sintered LiTi2(PO4)3

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