Binding energy of self-interstitial atoms to grain boundaries: An experimental approach

Sadanov, E. V.; Dudka, O.V.; Ksenofontov, V. A.; Mazilova, T. I.; Starchenko, I.V.; Manakin, V.L.; Mikhaĭlovskij, I. M.

doi:10.1016/j.matlet.2016.07.089

Cited by 3 publications

(1 citation statement)

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“…The grain sizes of undoped and doped 1% Ni samples at different calcination temperatures are calculated according to the Scherrer formula (Equation (1)) and listed in Tables 3 and 4, which shows that the grain size of the sample increases with temperature. This is because the atomic thermal activation energy and the diffusion coefficient of the atoms both increase with increasing temperature, which makes it easier for the atoms to migrate from the grain boundary to another crystal cell and form the state of atomic aggregation, thus making the overall energy of the crystal more stable [38]. When the calcination temperature is too high, however, the pore size and pore volume of the mesoporous crystal are reduced significantly, the skeletal density of the crystal increases accordingly, and the surface of the sample becomes dense, which is not conducive to ion intercalation and is drawn-out [39].…”

Section: Xrd Analysismentioning

confidence: 99%

Preparation of Ni-Doped Li2TiO3 Using an Inorganic Precipitation–Peptization Method

et al. 2019

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The precursor for a lithium-ion sieve is prepared using an inorganic precipitation-peptization method with titanium sulfate as the titanium source and lithium acetate as the lithium source. The effects of Ni2+ (Nickel ions) doping on the stability of the sol, crystal morphology and interplanar spacing of Li2TiO3 are investigated. The results indicate that, after Ni2+ doping with varying fractions, the stability of the precursor sol first increases then decreases, and the maximum stabilization time of the precursor sol doped with 1% Ni2+ is 87 h. When doped with 1% Ni2+, the sol performance is most stable, the porous Li2TiO3 is obtained, and the specific surface area of Li2TiO3 increases by up to 1.349 m2/g from 0.911 m2/g. Accompanying the increase in calcination temperature, the inhibition of Ni2+ doping on the growth and crystallization of grains decreases. When the temperature is lower than 750 °C, Ni atoms replace the Ti atoms that are substituted for Li atoms in the original pure Li layer, forming lattice defects, resulting in the disappearance of (002) and (−131) diffraction peaks for Li2TiO3, the reduced ordering of crystal structure, a decrease in the interplanar spacing of the (002) plane, lattice expansion and an increase in the particle size to 100–200 nm. When the temperature exceeds 750 °C, with the increase of calcination temperature, the influence of Ni doping on the growth and crystallinity of grains decreases, and the (002) crystal surface starts to grow again.

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Section: Xrd Analysismentioning

confidence: 99%