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  • 1
    Electronic Resource
    Electronic Resource
    Y(E)-doped tetragonal zirconia polycrystalline solid electrolyte (1989)
    Springer
    Journal of materials science 24 (1989), S. 708-716 
    Details
    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 Polycrystalline dense zirconia containing 100% metastable tetragonal phase was obtained by alloying zirconia with 2 to 3 mol % Y2O3 (Er2O3). A critical temperature, approximately 1400°C, for full densification (100% theoretical density) was found, and above that a sudden density decrease in all sintered bodies took place. The fracture toughness (K IC) was found to be strongly dependent on the grain size, and a critical grain size (0.29μm in Y-TZP and 0.38μm in Er-TZP) existed beyond which a steepK IC decrease was produced. Phase composition and microstructural development seem to influence such mechanical behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01107464
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  • 2
    Electronic Resource
    Electronic Resource
    Solid-state reaction, microstructure and phase relations in the ZrO2-rich region of the ZrO2-Yb2O3 system (1993)
    Springer
    Journal of materials science 28 (1993), S. 3451-3456 
    Details
    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 Phase relations below 1700°C in the ZrO2-rich region of the zirconia-ytterbia system have been established using thermal expansion, room-temperature X-ray diffraction, precision lattice parameter measurements and microscopic observations. The solubility limits of ytterbia in both monoclinic and tetragonal zirconia were determined. A eutectoid reaction, tetragonal zirconia solid solution→ monoclinic + cubic zirconia solid solutions at 400 ± 20°C and 2.4 mol % ytterbia was found. The left-hand boundary of the cubic zirconia solid-solution field was redetermined between room temperature and about 1700°C. Long-range ordering was present at 40 mol % ytterbia and the formation of an ordered phase, Zr3Yb4O12, isostructural with M7O12-type compounds was found. Its thermal stability was established between room temperature and 1630 ± 10°C, in which it decomposes into cubic zirconia solid solution by an order-disorder reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01159821
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  • 3
    Electronic Resource
    Electronic Resource
    Photoconduction behaviour in copper phosphate glasses (1986)
    Springer
    Journal of materials science 5 (1986), S. 925-927 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01729278
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  • 4
    Electronic Resource
    Electronic Resource
    Electrical behaviour of doped-yttria stabilized zirconia ceramic materials (1983)
    Springer
    Journal of materials science 18 (1983), S. 1315-1322 
    Details
    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 Single-phase sintered ceramic materials (ZrO2)1−x {(Y2O3) y (RE2O3)1-y x }x (RE=Nd, Ce, Dy, Er), were synthesized and electrical conductivity and transport number measurements were made as a function of temperature between 500 and 1200° C. The activation energies of conduction were determined, and it was found that the charge carriers in these solid solutions are oxygen ions. The fabricated electrolyte discs were used in cells of the type $$P_{O_2 }$$ , Pt/zirconia solid solution/ $$P_{\mathop O\limits^{'} _2 }$$ , platinum where $$P_{O_2 }$$ =air (0.21 atm) and $$P_{\mathop O\limits^{'} _2 }$$ =1 atm or argon-O2 mixtures. Below 700° C, the e.m.f. deviated from the theoretical values for completely ionic conduction; good agreement was observed above this temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111948
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  • 5
    Electronic Resource
    Electronic Resource
    Y(Er)-doped tetragonal zirconia polycrystalline solid electrolyte (1988)
    Springer
    Journal of materials science 23 (1988), S. 4349-4356 
    Details
    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 Submicronized Y(Er)-doped zirconia powders were prepared by the hydroxide-gel precipitation method. The agglomeration state and surface of both precursors and calcined oxides are studied and are related to the compaction and sintering behaviour. The compaction response was different for the two doped zirconias which was related to the different strength of aggregates present in the powders. Although a different breakpoint in the compaction curve for each of the powders was found, the sintering behaviour was quite similar which indicates that at high compaction pressures all the aggregates were broken up and uniformly distributed in a regular packing of very fine particles. Densification during sintering seems to be governed by both the high surface activity of the powders as the driving force (below 1400° C) and the grain growth above that temperature: the shrinkage behaviour was in close agreement with the isothermal experiment results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551930
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  • 6
    Electronic Resource
    Electronic Resource
    Dielectric properties of R2O−SiO2 glasses prepared via sol-gel (1989)
    Springer
    Journal of materials science 24 (1989), S. 2884-2890 
    Details
    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 Gels from R2O−SiO2 (R=potassium, sodium and lithium) systems with a maximum alkaline content of 5 mol % were prepared. The conductivity and the alkaline ion incorporation degree as a function of temperature were studied by a.c. impedance spectroscopy and dielectric relaxation measurements. At low temperature (20 to 200°C) the major contribution to the total electric conductivity is due to water conducting species (mainly protons) which are adsorbed inside the gels. From 450°C gels start to behave as conventional glasses. The total electric conductivity and activation energy values for conduction at those high temperatures are of the same order as those for glasses prepared by direct melting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385642
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of the calcining temperature on the sintering and properties of PZT ceramics (1993)
    Springer
    Journal of materials science 28 (1993), S. 3482-3488 
    Details
    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 Niobia-doped PZT powders were prepared by both hydroxide and oxalate coprecipitation methods. The resulting amorphous powders were calcined at two different temperatures (550 and 700 °C) and the morphology and size of the calcined particles were studied. It was found that hydroxide powders, when calcined at 700 °C, gave 98% theoretical density,d th, bodies at a sintering temperature as low as 1100°C in air. The high agglomeration present in oxalate powders strongly retarded densification. Of the piezoelectric properties, ak p higher than 60% and ad 33 constant of 360 × 10−12 CN−1 were measured. Dielectric parametersT c andk 3T, 310° C and 1100, respectively, were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01159826
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical and morphological studies of polymeric composites based on carbon black (1991)
    Springer
    Journal of materials science 26 (1991), S. 4022-4025 
    Details
    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 Conventional polymers, polypropylene and polystyrene, containing carbon black as conductor additive, were prepared. Impedance complex-plane analysis is used in order to characterize the composites obtained. Microstructure studies indicate that carbon black affects the size but not the geometrical morphology. The electrical conductivity of polypropylene composites is higher than polystyrene, and is correlated to the microstructural and wettability properties of these polymer matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02402942
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  • 9
    Electronic Resource
    Electronic Resource
    Electrical and morphological studies of polymeric composites based on carbon black (1991)
    Springer
    Journal of materials science 26 (1991), S. 4022-4025 
    Details
    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 Conventional polymers, polypropylene and polystyrene, containing carbon black as conductor additive, were prepared. Impedance complex-plane analysis is used in order to characterize the composites obtained. Microstructure studies indicate that carbon black affects the size but not the geometrical morphology. The electrical conductivity of polypropylene composites is higher than polystyrene, and is correlated to the microstructural and wettability properties of these polymer matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553484
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  • 10
    Electronic Resource
    Electronic Resource
    Conductivity study on semicrystalline and amorphous polymers filled with conducting additives (1990)
    Springer
    Polymer bulletin 24 (1990), S. 87-91 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polymeric conducting composites were obtained on the basis of polypropylene and polystyrene and conducting fillers (iron, copper and carbon black). The materials obtained by means of physical blends of the components were characterized through complex impedance diagrams. The respective data provided evidence of the fact that the conduction mechanism of such composites depends both on the chemical and structural properties of the polymeric matrix and on the nature of the conducting additive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298326
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