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  • 1
    Publication Date: 1992-02-28
    Description: Many organisms construct structural ceramic (biomineral) composites from seemingly mundane materials; cell-mediated processes control both the nucleation and growth of mineral and the development of composite microarchitecture. Living systems fabricate biocomposites by: (i) confining biomineralization within specific subunit compartments; (ii) producing a specific mineral with defined crystal size and orientation; and (iii) packaging many incremental units together in a moving front process to form fully densified, macroscopic structures. By adapting biological principles, materials scientists are attempting to produce novel materials. To date, neither the elegance of the biomineral assembly mechanisms nor the intricate composite microarchitectures have been duplicated by nonbiological processing. However, substantial progress has been made in the understanding of how biomineralization occurs, and the first steps are now being taken to exploit the basic principles involved.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heuer, A H -- Fink, D J -- Laraia, V J -- Arias, J L -- Calvert, P D -- Kendall, K -- Messing, G L -- Blackwell, J -- Rieke, P C -- Thompson, D H -- New York, N.Y. -- Science. 1992 Feb 28;255(5048):1098-105.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH 44106.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1546311" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone Matrix ; Calcification, Physiologic ; *Ceramics ; Chickens ; Crystallography
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2008-10-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Messing, Gary L -- Stevenson, Adam J -- New York, N.Y. -- Science. 2008 Oct 17;322(5900):383-4. doi: 10.1126/science.1160903.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA. messing@matse.psu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18927378" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2018-01-12
    Description: In this work we investigate the effects of powder chemistry on the sintering of MgO-doped specialty alumina. The stages at which MgO influences densification of Al 2 O 3 were identified by comparing dilatometry measurements and the sintering kinetics of MgO-free and MgO-doped specialty alumina powders. MgO is observed to reduce the grain boundary thickness during densification using TEM. We show that MgO increases the solubility of SiO 2 in alumina grains near the boundaries using EDS. First-principles DFT calculations demonstrate that the co-dissolution of MgO and SiO 2 in alumina is thermodynamically favored over the dissolution of MgO or SiO 2 individually in alumina. This study experimentally demonstrates for the first time that removal of SiO 2 from the grain boundaries is a key process by which MgO enhances the sintering of alumina. This article is protected by copyright. All rights reserved.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Wiley
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2551-2553 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The piezoelectric properties of (1−x) Pb(Mg1/3Nb2/3)O3–xPbTiO3 (x=0.3–0.35), ceramics with a high degree of 〈001〉 fiber texture were investigated for possible actuator applications. Piezoelectric coefficients (d33) in excess of 1200 pC/N associated with strain levels up to 〉0.3% were observed in samples prepared by a reactive templated grain growth process. No excess PbO was used in the starting composition. A high degree of fiber texture was achieved using 〈001〉 oriented BaTiO3 template particles in a fine-grained precursor for the PMN–32PT matrix. High densities together with texture resulted in a significant increase in strain levels and d33 values compared to their polycrystalline counterparts. Peak dielectric constants on the order of 22 000 with losses of ∼2% and well-saturated hysteresis loops with a Pr∼27 μC/cm2 were recorded on the textured samples. These domain engineered, textured ceramics have tremendous potential for high-performance actuators. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (2000), S. 1661-1664 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 33 (1998), S. 913-921 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract It is demonstrated that inherent constrained densification characteristics of the bimodal size distributed powders can be utilized to fabricate porous alpha alumina. Seeded boehmite was mixed with coarse alpha alumina particles to produce various compositions of bimodal mixtures. The densification behaviour of the mixtures was correlated with shrinkage and microstructural evolution. The mixtures sintered at 1200 °C contained more than 30% porosity and the mechanical strength of the mixtures was increased by 2–4 fold relative to the coarse particles alone with similar porosity (〈5 MPa). © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (1984), S. 1530-1534 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of hot isostatic pressing (HIPing) on sintered lead zirconate titanate are presented. Densities up to ∼98% were obtained by HIPing for 1 h at 1300°C with argon gas pressures of either 20.7 or 138 MPa. The microstructural changes observed after HIPing, and the rapid initial kinetics for densification and pore shrinkage, indicate that prssure-enhanced grain rearrangement and solution-precipitation processes are primarily responsible for densification. The persistance of large voids after HIPing suggests that it may be impossible to completely eliminate gross processing-related defects in lead zirconate titanate by HIPing.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 34 (1999), S. 3249-3261 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The reaction bonding of aluminum oxide (RBAO) process was analyzed from the milling of the precursor mixtures to the sintering of the reaction bonded α-alumina as a function of precursor powder composition, Al particle size, temperature, and heating rate. The RBAO process involves both solid-gas (T 〈 TM,AI) and liquid-gas (T 〉 TM,AI) oxidation of Al + α-Al2O3 powder compacts. It has been demonstrated that maximum Al content of the precursor powder is limited to 60 vol %. In addition, it was observed that the initial Al particle size affects the oxidation behavior significantly and hence final properties of α-Al2O3 compacts. Therefore, the initial Al particle size is very critical for the RBAO process. The critical Al particle size (i.e., the largest Al particle size can be used to obtain dense ceramic materials by the RBAO process) was determined as ∼1.5 μm. It has been demonstrated that heating rate can be used to improve the final microstructures of RBAO ceramics. Although there is no large (〉4 vol %) amount of ZrO2 addition, alpha aluminum oxide ceramics with 97% TD have been produced by optimizing the processing parameters such as fine (〈1.5 μm) Al particles and slower heating rate during the liquid-gas oxidation.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 35 (2000), S. 5673-5680 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Sr : Nb stoichiometry and donor-doping with La were found to affect densification behavior and anisotropic grain growth in Sr2Nb2O7 ceramics. La-doping improved the high temperature a.c. resistivity, but inhibits grain growth by grain boundary pinning. The presence of excess Nb was found to promote anisotropic grain growth by forming a liquid at the grain boundaries in both undoped and doped Sr2Nb2O7. Anisotropic grain growth in La-doped Sr2Nb2O7 can be controlled by incorporating large template particles in a Nb-rich matrix. High sintered densities (∼98% of theoretical) were achieved in both undoped and La-doped samples.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 16 (1997), S. 168-170 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Abstracts are not published in this journal
    Type of Medium: Electronic Resource
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