2014
DOI: 10.1021/jp508663p
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Surface Segregation on Manganese Doped Ceria Nanoparticles and Relationship with Nanostability

Abstract: Highly stable ceria nanoparticles (< 11 nm) with different manganese contents were prepared by a co-precipitation method. The powders were studied by x-ray diffraction, transmission electron microscopy, electron energy loss spectroscopy, and water adsorption microcalorimetry. The data show that only a small fraction of the manganese ions dissolved into ceria fluorite structure as solid solution, and most segregated on the particles' surface, causing decrease of the average surface energy of the particles with … Show more

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Cited by 70 publications
(81 citation statements)
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“…The smaller grain size for the lanthanum doped sample already suggests a thermodynamic effect of the dopant on the surface energy of the nanoparticles, as recently proposed. 41 The nanoparticles were subjected to SPS for densification and high densities were achieved (;95% of theoretical value). XRD patterns after densification are also presented in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The smaller grain size for the lanthanum doped sample already suggests a thermodynamic effect of the dopant on the surface energy of the nanoparticles, as recently proposed. 41 The nanoparticles were subjected to SPS for densification and high densities were achieved (;95% of theoretical value). XRD patterns after densification are also presented in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…14,22,24 Because no phase separation occurred, or parallel reactions, the released heat was attributed to the change in GB area during the characteristic exothermic peak. GB areas (GBA) were calculated using a tetrakaidecahedral grain shape and a grain size distribution determined by SEM 22,25,26 using the equation…”
Section: Calorimetric Measurement and Grain Growth Studymentioning
confidence: 99%
“…Nanoceramics can only be manufactured when the precursor powders are nanosized and smaller than the desired final size for the nanoceramic. One strategy that has been successfully used to obtain ceramic nanopowders is the use of additives that are segregated at the interfaces (GBs and surfaces) and reduce the interfaces energy, reducing the driving force for particle growth . If additive segregation at the interfaces occurs in nanoscale crystalline domains, the thermodynamic effects of segregation are more evident than those in coarser materials owing to the higher interface density …”
Section: Introductionmentioning
confidence: 99%
“…However, the separation of the kinetic and thermodynamic contributions is difficult with the addition of additives to the material, which are usually seen as physical barriers reducing the GB mobility and are mostly studied as kinetic phenomena. With the advancements of calorimetric techniques for the measurement of the interface energy of nanoparticles, it is possible to show that the surface energy does not remain constant with an increase in the doping content; thus, the nanostability is partially attributed to thermodynamic effects …”
Section: Introductionmentioning
confidence: 99%