Effect of alumina addition on the microstructure and grain boundary resistance of magnesia partially-stabilized zirconia

Yoon, Sang-Hyeon; Tyne, C. J. Van; Lee, Heesoo

doi:10.1016/j.cap.2014.04.010

Cited by 15 publications

(8 citation statements)

References 22 publications

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“…Thus, Bi 2 O 3 segregated at the grain boundaries can remove impurities, such as aluminum oxide, silicon oxide, etc . [30,31], so that the amorphous phase with high resistance is absent at the grain boundaries. What’s more, the Bi 2 O 3 segregated at grain boundaries bridges the grains for oxygen transportation and increases the sample conductivity.…”

Section: Resultsmentioning

confidence: 99%

Effect of Bismuth Oxide on the Microstructure and Electrical Conductivity of Yttria Stabilized Zirconia

Liu

Zhou

Tian

et al. 2016

Sensors

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Bismuth oxide (Bi2O3)-doped yttria-stabilized zirconia (YSZ) were prepared via the solid state reaction method. X-ray diffraction and electron diffraction spectroscopy results indicate that doping with 2 mol% Bi2O3 and adding 10 mol% yttria result in a stable zirconia cubic phase. Adding Bi2O3 as a dopant increases the density of zirconia to above 96%, while reducing its normal sintering temperature by approximately 250 °C. Moreover, electrical impedance analyses show that adding Bi2O3 enhances the conductivity of zirconia, improving its capability as a solid electrolyte for intermediate or even lower temperatures.

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Section: Resultsmentioning

confidence: 99%

Effect of Bismuth Oxide on the Microstructure and Electrical Conductivity of Yttria Stabilized Zirconia

Liu

Zhou

Tian

et al. 2016

Sensors

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“…7 This gives birth to microcracks and failure in the sintered zirconia ceramics and also makes pure, undoped zirconia (in monoclinic form) an unsuitable candidate for engineering applications. To overcome these undesired properties, generally, some amount of metal oxide stabilizers like yttria (Y 2 O 3 ), 11 calcia (CaO), 19 magnesia (MgO), 20 ceria (CeO 2 ) 21 etc. with different crystal structures (along with comparatively high solubility) in zirconia are doped.…”

Section: Introductionmentioning

confidence: 99%

“…Doping of cations inside zirconia matrix results in decrease in particle/crystallite size, which ultimately stabilizes tetragonal structure of zirconia nanoparticles/ceramics. [22][23][24] Partially stabilized zirconia (PSZ) 20,25 generally contains mixtures of at least two phases (tetragonal, monoclinic and/or cubic), whereas fully stabilized zirconia (FSZ) depicts entirely cubic phase. 26 Another category, namely TZP, refers to the family of tetragonal zirconia polycrystals where only 21,27 the tetragonal phase is present.…”

Section: Introductionmentioning

confidence: 99%

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Structure‐property relations for a phase‐pure, nanograined tetragonal zirconia ceramic stabilized with minimum CaO doping

2021

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Zirconia (ZrO 2 )-based ceramics have dominated the engineering ceramics market for ages due to its diverse properties, for example, high strength, 1 notable hardness and toughness, 1,2 promising wear resistance, 3 bio-inertness, 4 high ionic conductivity, 5 modest coefficient of thermal expansion, 6 and elastic modulus similar to steel 7 (zirconia is also known as "ceramic steel" 7,8 ). High ionic conductivity in intermediate temperature makes the doped zirconia ceramics relevant for solid oxide fuel cell applications (as an electrolyte). 9,10 For biomedical applications, viz., in dentistry (for crown and bridge) 11 and prosthetic industry (as the ball heads for hip replacements), 12 ZrO 2 -based ceramics find its relevance due to its nontoxicity and mechanical integrity. For structural applications, zirconia-based ceramics are mostly used as cutting tools. 13 The other applications of zirconia involve fields like gas sensors, 14,15 refractories, 16 structural opacifiers, 17 and thermal barrier coating (TBC) 18 etc.Pure zirconia 5 has three crystalline polymorphic forms, namely monoclinic, tetragonal, and cubic. Among these polymorphs, monoclinic phase is stable at room temperature. At high temperature (>1170°C), there is a prominent volume expansion (~4%) associated with the tetragonal to monoclinic phase transformation (in zirconia bodies) during cooling. 7 This gives birth to microcracks and failure in the sintered zirconia ceramics and also makes pure, undoped zirconia (in monoclinic form) an unsuitable candidate for engineering applications. To overcome these undesired properties, generally, some amount of metal oxide stabilizers like yttria (Y 2 O 3 ), 11 calcia (CaO), 19 magnesia (MgO), 20 ceria (CeO 2 ) 21 etc. with different crystal structures (along with comparatively high solubility) in zirconia are doped. Doping stabilizes the high-temperature polymorphs, that is, tetragonal and cubic phases at ambient conditions. Doping of cations inside zirconia matrix results in decrease in particle/crystallite size, which ultimately stabilizes tetragonal structure of zirconia nanoparticles/ceramics. [22][23][24] Partially stabilized zirconia

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“…Of the additives, Al 2 O 3 increased the thermal conductivity of stabilized zirconia because Al 2 O 3 exhibits a higher thermal conductivity than zirconia in the Y 2 O 3 ‐ZrO 2 system. In MgO‐ZrO 2 , on the other hand, added Al 2 O 3 destabilizes MgO‐ZrO 2 because Al 2 O 3 has a higher reactivity with Mg, the stabilizer in MgO‐ZrO 2 , which increases the monoclinic phase as the Al 2 O 3 content increase . Al 2 O 3 has also been reported as one of the most effective additives to neutralize the harmful effect of the siliceous phase in the zirconia system .…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Ionic Conductivity of Calcia‐Stabilized Zirconia with Alumina Addition

Kim

Ryu

Jeon

et al. 2016

Int J Applied Ceramic Tech

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The thermal expansion and ionic conduction of 15 mol% CaO‐stabilized zirconia (CSZ) with added Al2O3 were investigated. Specimens with 0.5 and 1 mol% Al2O3 maintained the cubic phase, and the thermal diffusivity increased from 0.499 to 0.661 mm2/s with a 1 mol% addition. The addition of 5 mol% caused a decrease in the thermal diffusivity (0.609 mm2/s) with the formation of the monoclinic phase. The thermal expansion coefficient of the CSZ decreased, and the thermal diffusivity increased with the addition of Al2O3. The ionic conductivity was increased up to the addition of 1 mol% due to scavenging of siliceous by Al2O3, while the 5 mol% addition showed a decrease in conductivity with the formation of the intergranular phase.

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Effect of alumina addition on the microstructure and grain boundary resistance of magnesia partially-stabilized zirconia

Cited by 15 publications

References 22 publications

Effect of Bismuth Oxide on the Microstructure and Electrical Conductivity of Yttria Stabilized Zirconia

Effect of Bismuth Oxide on the Microstructure and Electrical Conductivity of Yttria Stabilized Zirconia

Structure‐property relations for a phase‐pure, nanograined tetragonal zirconia ceramic stabilized with minimum CaO doping

Thermal Stability and Ionic Conductivity of Calcia‐Stabilized Zirconia with Alumina Addition

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