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  • Oxford University Press (OUP)  (10)
  • 2000-2004  (10)
  • 1
    Online Resource
    Online Resource
    Boundary Migration in Rutile
    Oxford University Press (OUP) ; 2003
    In:  Microscopy and Microanalysis Vol. 9, No. S02 ( 2003-08), p. 676-677
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 9, No. S02 ( 2003-08), p. 676-677
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927603443389
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2003
    detail.hit.zdb_id: 1481716-0
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  • 2
    Online Resource
    Online Resource
    Microanalysis of AFM Tips Coated with Cerium Oxide
    Oxford University Press (OUP) ; 2001
    In:  Microscopy and Microanalysis Vol. 7, No. S2 ( 2001-08), p. 1236-1237
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 7, No. S2 ( 2001-08), p. 1236-1237
    Abstract: Cerium oxide is widely used for chemomechanical polishing (CMP) of silicate glasses. Uses include finishing of optical elements and planarizing dielectrics in the semiconductor industry. This study is designed to investigate the fundamentals of the cerium oxide/silica CMP process by measuring the interaction force between silicate glasses and cerium oxide. Surface forces involved in the polishing of glass by a cerium oxide abrasive can be studied in a controlled manner by measuring sample-tip interactions between a glass substrate and a cerium oxide tip in an atomic force microscope (AFM). Commercially available AFM tips have been coated with thin, uniform films of cerium oxide. By using a square pyramid tip as a template for the shape of the cerium oxide film, challenges related to irregular or blunt tip shape can be overcome. However, complete characterization of structure, shape and chemical composition is required before useful information can be obtained using the AFM.
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927600032256
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2001
    detail.hit.zdb_id: 1481716-0
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  • 3
    Online Resource
    Online Resource
    Surfaces of Gadolinium Gallium Garnet
    Oxford University Press (OUP) ; 2000
    In:  Microscopy and Microanalysis Vol. 6, No. S2 ( 2000-08), p. 716-717
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 6, No. S2 ( 2000-08), p. 716-717
    Abstract: Sintering and many problems in adsorption and catalysis require an understanding of the surface structures of crystals, which have been subjected to various types of heat treatment. For example, heat treatment of m-plane sapphire surfaces can cause a transformation from a flat vicinal surface into those of a faceted hill-and-valley structure. Many technologically interesting materials form with the garnet structure, including YIG, YAG, GGG and many silicates. However, there has been relatively little discussion of the structure and behavior of such surfaces. This paper illustrates the use of visible-light microscopy (VLM), atomic-force microscopy (AFM) and scanning electron microscopy (SEM) for studying the ﹛111﹜ surface of gadolinium gallium garnet (GGG or Gd 3 Ga 5 O 12 ). 2x2x1 mm samples of monocrystalline GGG with ﹛111﹜ surface orientation were heat treated in air at 1575°C for 24 hours in order to study the processes a surface undertakes while reaching its equilibrium state.
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927600036072
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2000
    detail.hit.zdb_id: 1481716-0
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  • 4
    Online Resource
    Online Resource
    Analysis of Grain Boundary Migration in Alumina
    Oxford University Press (OUP) ; 2003
    In:  Microscopy and Microanalysis Vol. 9, No. S02 ( 2003-08), p. 64-65
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 9, No. S02 ( 2003-08), p. 64-65
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927603441019
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2003
    detail.hit.zdb_id: 1481716-0
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  • 5
    Online Resource
    Online Resource
    Application of FIB and TEM for the Characterization of Dewetting Behavior on Ceramics
    Oxford University Press (OUP) ; 2002
    In:  Microscopy and Microanalysis Vol. 8, No. S02 ( 2002-08), p. 562-563
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 8, No. S02 ( 2002-08), p. 562-563
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927602105484
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2002
    detail.hit.zdb_id: 1481716-0
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  • 6
    Online Resource
    Online Resource
    TEM Analysis of an Alumina Bicrystal Section Using a Fib
    Oxford University Press (OUP) ; 2001
    In:  Microscopy and Microanalysis Vol. 7, No. S2 ( 2001-08), p. 326-327
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 7, No. S2 ( 2001-08), p. 326-327
    Abstract: Grain boundary migration (GBM) during the sintering and densification of a polycrystalline ceramic material occurs as a result of mass transport across an interface. When there is a liquid film present, either due to additives used for liquid-phase sintering or unavoidable impurities in the material, the mass transport can be visualized in terms of dissolving material from one grain and precipitating it on another. in order to study the effects of crystallography on GBM in the presence of a liquid phase, alumina bicrystals have been fabricated with anorthite (CaA12Si208) glass films at the interface. The alumina-anorthite system in a bicrystal geometry is used because the pseudo-binary phase diagram of the system is well known, the bicrystal geometry allows for control over the original interface misorientation, and the glassy phase of anorthite is the most commonly occurring glass in commercially used alumina. Fig. 1 is a secondary-electron SEM image of an alumina bicrystal recorded using a field-emission SEM (Hitachi S900) operating at 5 kV.
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927600027707
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2001
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  • 7
    Online Resource
    Online Resource
    Migrating Interfaces in Sapphire Bicrystals and Tricrystals
    Oxford University Press (OUP) ; 2000
    In:  Microscopy and Microanalysis Vol. 6, No. S2 ( 2000-08), p. 386-387
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 6, No. S2 ( 2000-08), p. 386-387
    Abstract: The migration of grain boundaries in polycrystalline materials can occur under a variety of driving forces. Grain growth in a single-phase material and Ostwald ripening of a second phase are two common processes involving boundary migration. The mass transport in each of these cases can be related to a chemical potential difference across the grains; due to curvature in the former case and due to a difference in the chemistry in the latter case. The mass transport across grains controls the densification process during sintering. In the case of liquid-phase sintering (LPS), a liquid film may be present at the grain boundaries which results in an enhanced mass transport between grains leading to faster densification. Hence, in LPS, it is important to understand mass transport across and along a boundary containing a liquid film. The use of bicrystals and tricrystals with glass layers in the boundary can provide a controlled geometry by which to study this phenomenon.
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927600034425
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2000
    detail.hit.zdb_id: 1481716-0
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  • 8
    Online Resource
    Online Resource
    Surface Steps on Flux-Grown Alumina
    Oxford University Press (OUP) ; 2001
    In:  Microscopy and Microanalysis Vol. 7, No. S2 ( 2001-08), p. 416-417
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 7, No. S2 ( 2001-08), p. 416-417
    Abstract: The utility of a surface to serve as a substrate depends upon its surface structure. The presence of steps on the surface affects the quality of the deposited material. The basal surface of alumina is one of the most widely used substrate materials and hence considerable effort has been directed towards the study of this surface. The mechanism of formation of a stepped structure on the basal surface of alumina has been investigated using atomic force microscopy. The evolution of steps on the basal surface as a function of temperature has been reported. Flux growth is an attractive route for producing alumina because of the low temperatures required for processing and the extremely low dislocation densities that can be obtained. in the present study, the structure of steps on flux-grown alumina has been investigated. Formation of low-index macrofacets as a result of crystal growth has been observed.
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927600028154
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2001
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  • 9
    Online Resource
    Online Resource
    Dewetting of Liquids on Ceramic Surfaces at High Temperatures
    Oxford University Press (OUP) ; 2002
    In:  Microscopy and Microanalysis Vol. 8, No. 4 ( 2002-08), p. 257-267
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 8, No. 4 ( 2002-08), p. 257-267
    Abstract: The influence of surface structure and chemistry on high-temperature dewetting of silicate liquids on ceramic surfaces has been investigated. Model systems based on well-defined crystallography and known chemistry have been used to illustrate the effect of surface roughness and chemistry on the dewetting process. Reconstructed ceramic surfaces provide ideal substrates to study effects of surface roughness. It has been shown that the morphology of dewet droplets depend on the length scale and the crystallography of the facets on the surface. Complex pattern formation due to solute redistribution during dewetting is illustrated in the case of SiO 2 dewetting on (001) rutile substrates. The role of kinetics on the dewetting process has also been clarified.
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927602020196
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2002
    detail.hit.zdb_id: 1481716-0
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  • 10
    Online Resource
    Online Resource
    Silicate Glass and Evaporation from Sapphire Surfaces
    Oxford University Press (OUP) ; 2000
    In:  Microscopy and Microanalysis Vol. 6, No. S2 ( 2000-08), p. 388-389
    Details
    In: Microscopy and Microanalysis, Oxford University Press (OUP), Vol. 6, No. S2 ( 2000-08), p. 388-389
    Abstract: Ceramic materials are processed at high temperatures where different mechanisms of mass transport are operative. The liquid-phase sintering (LPS) process involves the formation of a silicate liquid at the sintering temperature. In this case, mass transport takes place at the solidliquid, solid-vapor and liquid-solid interfaces. The mechanism and kinetics of these processes controls the microstructure. The silicate phase, which is usually the sintering additive, may influence the evaporation from and of the ceramic. The importance of the evaporation process has been clearly brought out in previous studies on the dewetting of silicates on a ceramic substrate. The present study considers the influence of a silicate phase (celsian) on evaporation from a ceramic (sapphire) substrate. Pulsed-laser deposition (PLD) has been used to deposit thin films (∼100 nm thick) of celsian (BaAl 2 Si 2 O 8 ) on sapphire single-crystals of basal orientation. In the present study, the film/substrate assembly has been annealed at high temperatures (1750°C to 1850°C) in a vacuum furnace.
    Type of Medium: Online Resource
    ISSN: 1431-9276 , 1435-8115
    URL: Article
    DOI: 10.1017/S1431927600034437
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2000
    detail.hit.zdb_id: 1481716-0
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    SSG: 12
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