Effects of concurrent grain boundary and surface segregation on the final stage of sintering: the case of Lanthanum doped yttria-stabilized zirconia

Gong, Mingming; Dey, Sanchita; Wu, Longjia; Chang, Chi-Hsiu; Li, H; Castro, Ricardo H. R.; Liu, F

doi:10.1016/j.jmst.2017.01.023

Cited by 16 publications

(12 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the verification of thermo-kinetic correlation, in addition to the direct proofs which was provided by Peng et al, 56,[62][63][64][65][66][67][68] there have been a few indirect experiment/simulated results to qualitatively support the theory of thermo-kinetic stabilization. Differing from microstructural evolution behavior in metal materials, the grain growth in NC ceramics often occurs together with the densification and it is highly difficult to separate one process from the other.…”

Section: Indirect Proofs By Qualitative Descriptionmentioning

confidence: 97%

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Peng

Jian

Liu

2020

Int J Ceramic Engine & Sci

View full text Add to dashboard Cite

Nanocrystalline (NC) materials exhibit many unique properties over their coarse‐grained counterparts due to the high grain boundary density and the small grain size, but they are too difficult to be used in engineering environment because of the poor thermal stability. With regard of this, two strategies are previously proposed to enhance the thermal stability (or impede the grain growth) of NC materials, that is, the thermodynamic and the kinetic approaches. Recent investigations increasingly support that the two approaches may be physically interacted and acted on each other, and they can be treated together within a unified thermo‐kinetic framework. This paper reviews the progress in the investigation of thermo‐kinetic correlation during grain growth in NC materials. First, the theoretical models to describe the concept of the thermo‐kinetic correlation and the grain growth equations developed based on the thermo‐kinetic correlation are reviewed. Second, experimental and simulated evidences to support the coexistence of thermodynamic and kinetic effects are summarized. Third, the potential application of thermo‐kinetic correlation is analyzed and discussed. This paper shows that the stabilization of NC materials can be tailored by the selection of the suitable strategies. Finally, several directions that require further exploration are identified.

show abstract

Section: Indirect Proofs By Qualitative Descriptionmentioning

confidence: 97%

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Peng

Jian

Liu

2020

Int J Ceramic Engine & Sci

View full text Add to dashboard Cite

show abstract

“…The surface energy (γ s0 ) for 12YSZ was determined as 1.17 J m -2 using water adsorption microcalorimetry, see ref. [55]. The segregation enthalpy of GB and surface, ΔH seg gb and ΔH seg s for La in YSZ was derived to be -48.75 and -54.80 kJ mol -1 , respectively [55].…”

Section: Procedures Of Model Application and Determination Of Parametersmentioning

confidence: 98%

“…The solute distribution in a polycrystalline system, including the possibility of segregation to GBs and pore surfaces [55], has been demonstrated to follow the same form as Langmuir-Mclean segregation isotherm [56]:…”

Section: Description Of Dopant Re-distribution During Grain Growthmentioning

confidence: 99%

“…where x 0 is the total solute molar fraction, and f gb and f s are the site fractions occupied by GBs and pore surface, respectively. Under the approximation of a tetrakaidecahedron for grain shape [57], these can be expressed as a function of grain size and relative density [55]:…”

Section: Description Of Dopant Re-distribution During Grain Growthmentioning

confidence: 99%

“…[55]. The segregation enthalpy of GB and surface, ΔH seg gb and ΔH seg s for La in YSZ was derived to be -48.75 and -54.80 kJ mol -1 , respectively [55]. The interatomic distance a was estimated from the cubic root of a unit cell volume, i.e.…”

Section: Procedures Of Model Application and Determination Of Parametersmentioning

confidence: 99%

See 2 more Smart Citations

Modeling the grain growth kinetics of doped nearly fully dense nanocrystalline ceramics

Gong

Chang

et al. 2017

Ceramics International

Self Cite

View full text Add to dashboard Cite

A grain growth model to describe dopant effects on nanocrystalline ceramics is proposed by incorporating the dopant-segregation-dependent grain boundary (GB) energy and the GB mobility subjected to intrinsic drag and pore drag (both affected by dopant segregation) into the parabolic growth formula. The model addresses the common case of residual porosity in grain growth behavior. Taking near-fully dense nanocrystalline lanthanum doped Yttria stabilized Zirconia (La doped YSZ) as the system of study, the grain growth behavior was explored using the model. The substantially suppressed grain growth in La doped YSZ as compared to La-free YSZ could be attributed to the combined effect of thermodynamically reduced GB energy and kinetically reduced GB mobility. Contrary to previous assumptions, the model suggests that, relative to the GB energy overall effect, the effect of the dopant on the GB mobility plays a more significant role in reducing coarsening. Furthermore, model calculation shows that both intrinsic drag and pore drag makes certain

show abstract

Crystalline phase evolution and thermal behavior of zirconia‐lanthanum aluminate ceramics produced by surface modification

2020

View full text Add to dashboard Cite

The purpose of the present work was to investigate the effect doping with lanthanum aluminate on the phase assemblage and thermal behavior of zirconia ceramics for biomedical applications. Four compositions were prepared by a surface modification route of either conventional tetragonal zirconia (3Y‐TZP) or high translucency cubic‐based zirconia (5Y‐PSZ) to reach a nominal composition of either 0.5 wt. % (3Y‐0.5LAO and 5Y‐0.5LAO) or 5 wt. % of lanthanum monoaluminate (3Y‐5LAO and 5Y‐5LAO). Undoped powders were used as controls. DTA and XRD analyses revealed that lanthanum dizirconate crystallized in the 934°C–936°C range, while lanthanum aluminate crystallized in the 1,056°C–1,063°C range in both types of zirconias doped at the 5% level. No second phase was found in compositions doped at the 0.5% level. The a lattice parameter and the amount of the cubic phase increased in both 3Y‐5LAO and 5Y‐5LAO. The microstructure of the compositions doped with 5% LAO was characterized by well distributed LAO twinned crystals and sparse needle‐shaped lanthanum hexaaluminate crystals. A bimodal grain size distribution was observed in 5Y‐doped compositions. This was attributed to abnormal grain growth of the cubic phase, and in line with aluminum segregation at grain boundaries and the presence of second‐phase LAO crystals.

show abstract

Effects of concurrent grain boundary and surface segregation on the final stage of sintering: the case of Lanthanum doped yttria-stabilized zirconia

Cited by 16 publications

References 55 publications

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Modeling the grain growth kinetics of doped nearly fully dense nanocrystalline ceramics

Crystalline phase evolution and thermal behavior of zirconia‐lanthanum aluminate ceramics produced by surface modification

Contact Info

Product

Resources

About