Effect of flash sintering on microstructure of Ce0.9Gd0.1O1.95 electrolyte fabricated by tape-casting

Valdebenito, Jonathan Usuba; Akbari‐Fakhrabadi, Ali; Viswanathan, Mangalaraja Ramalinga

doi:10.1016/j.matlet.2017.07.129

Cited by 23 publications

(8 citation statements)

References 12 publications

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“…The advantage of performing flash sintering experiments on those compounds is that besides having chemical stability, their properties have been widely studied for decades [26]. However, there are few reports on flash sintering ceria-based solid electrolytes [27][28][29][30][31][32][33].…”

Section: Flash Sinteringmentioning

confidence: 99%

“…Conventional and flash sintered nanosized 10 mol% Gd 2 O 3 -doped CeO 2 produced dense specimens with uniform submicrometric grains [29]. Tape cast Ce 0.9 Gd 0.1 O 1.95 has been reported to reach high densification if the limit of the current density is appropriate, and particle size, porosity and homogeneity also played a role in the flash sintering results [30]. Gd-and Sm-doped ceria with Li and Co sintering aids were flash sintered to full density in short times at 700 • C, and achieved total ionic conductivity comparable to that obtained in samples conventionally sintered at 1500 • C [31].…”

Section: Flash Sintering Ceriamentioning

confidence: 99%

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Electrical Behavior of Electric Field-Assisted Pressureless Sintered Ceria-20 mol% Samaria

et al. 2019

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CeO2:20 mol% Sm2O3 green ceramic pellets were sintered conventionally at 1500 °C/2 h and flash sintered by applying a 200 V cm−1 electric field at 800 °C, 1000 °C and 1200 °C. The thickness shrinkage of the pellets was followed bythe specimen being positioned inside a dilatometer adapted with platinum electrodes and terminal leads connected to a power supply for application of the electric voltage. The microstructure of the surfaces of the sintered samples were observed in a scanning electron microscope. The electrical properties were evaluated by the impedance spectroscopy technique in the 5 Hz–13 MHz frequency range from 210 °C to 280 °C. The main results show that (i) the final shrinkage level is nearly independent of the temperature when the electric field is applied and slightly better than that of the 1500 °C sintered pellet, and (ii) the bulk conductivity of the sample flash sintered at 1200 °C is similar to that of the sample sintered at 1500 °C. The availability of a pathway for the electric current pulse derived from the applied electric field is proposed as the reason for the achieved shrinkages. Scavenging of the grain boundaries by Joule heating is proposed as the reason for the improved oxide ion bulk conductivity.

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Section: Flash Sinteringmentioning

confidence: 99%

Section: Flash Sintering Ceriamentioning

confidence: 99%

Electrical Behavior of Electric Field-Assisted Pressureless Sintered Ceria-20 mol% Samaria

et al. 2019

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“…Electric field-assisted pressureless sintering, usually named flash sintering when the phenomenon occurs in few seconds, has been successfully applied to several inorganic compounds since it was first reported in 2011 [1]; for example in ZrO 2 : 3 mol% Y 2 O 3 [1][2][3][4][5][6], ZrO 2 : 8 mol% Y 2 O 3 [7][8][9][10][11], ZrO 2 : 20 mol% Sc 2 O 3 [12], CeO 2 : 20 mol% Sm 2 O 3 and CeO 2 : 20 mol% Gd 2 O 3 [13][14][15][16][17][18], BaCe 0.8 X 0.2 O 3-δ (X=Y, Sm, Gd) [19,20], BaTiO 3 [21][22][23], BiFeO 3 [24], CaCu 3 Ti 4 O 12 [25], ZnO [26][27][28], SnO 2 [29,30], Al 2 O 3 [31,32], SrTiO 3 [33,34], ThO 2 [35], UO 2 [36,37], TiO 2 [38], SiC [39], Y 2 O 3 [40]. The flash sintering method consists of applying a DC or AC electric field to a ceramic green compact either under heating (dynamic flash sintering) or at a temperature usually below the conventional sintering temperature (isothermal flash sintering) [41].…”

Section: Introductionmentioning

confidence: 99%

Flash Sintering Samaria-Doped Ceria–Carbon Nanotube Composites

2019

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Composite ceramic green pellets were prepared by attrition milling a mixture of (CeO2)0.8(Sm2O3)0.2 (samaria-doped ceria, SDC) ceramic powder and carbon nanotubes (CNTs), followed by uniaxial and isostatic pressing. The pellets were sintered inside a dilatometer by applying AC electric fields at 850 °C and limiting the electric current to 1 A, achieving 20.2% final shrinkage. The SDC samples reached 13.3% shrinkage under the same conditions. Higher average grain sizes were measured in specimens flash sintered with CNTs. Impedance spectroscopy analyses show that the specimens flash sintered with addition of CNTs have higher electrical conductivity. Higher delivered Joule heating at the interfaces due to the presence of the electronic conductors (CNTs) are proposed as the main reason for that improvement of the electrical behavior.

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“…The flash phenomenon has been observed in many different inorganic compounds. A few recent examples include: Al 2 O 3 [5,6]; TiO 2 [7]; BaTiO 3 [8,9]; doped CeO 2 [10][11][12][13]; ZrO 2 : 3 mol% and 8 mol% Y 2 O [1, [14][15][16]; SnO 2 [17]; and ZnO [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Towards In-Situ Electron Microscopy Studies of Flash Sintering

Schwarzbach¹,

González‐Julián

Guillon

et al. 2019

Ceramics

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Flash sintering, a special case of electric field-assisted sintering, results in accelerated densification at lower temperatures than conventional sintering methods. However, the mechanisms remain elusive despite the wide application potential. In-situ electron microscopy studies reveal shrinkage of ZnO green bodies due to both heating and heating/biasing but show no obvious effect of the current on the behavior. In contrast, thin epitaxial ZnO films deposited on an Al2O3 substrate undergo a clear flash event during in-situ voltage application in the TEM, providing the first observation of flash sintering of a thin film. The specimen was captured in the high conductivity state where grain boundary motion was observed. The microscopic origins of the high conductivity state could not be detected, but may have the same underlying physical origin as the high conductivity memristive state.

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Effect of flash sintering on microstructure of Ce0.9Gd0.1O1.95 electrolyte fabricated by tape-casting

Cited by 23 publications

References 12 publications

Electrical Behavior of Electric Field-Assisted Pressureless Sintered Ceria-20 mol% Samaria

Electrical Behavior of Electric Field-Assisted Pressureless Sintered Ceria-20 mol% Samaria

Flash Sintering Samaria-Doped Ceria–Carbon Nanotube Composites

Towards In-Situ Electron Microscopy Studies of Flash Sintering

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