Diffusion in Cubic Sulphates

Kvist, Arnold; Bengtzelius, Ante; Trolle, Ulf

doi:10.1515/zna-1968-1224

Cited by 17 publications

(1 citation statement)

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“…The ionic transitional motion is enhanced 19,20 by rotational motion of transitionally static counter ions as found in the case of solid ionic conductor Li2SO4 17 .…”

Section: Introductionmentioning

confidence: 77%

Diffusion of sodium ions in amorphousNa2Si2O5: Quasielastic neutron scattering andab initiomolecular dynamics s

Gupta

Mishra

Mittal

et al. 2020

Phys. Rev. Materials

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We have investigated the dynamics of Na ions in amorphous Na2Si2O5, a potential solid electrolyte material for Na-battery. We have employed quasielastic neutron scattering (QENS) technique in the amorphous Na2Si2O5 from 300 to 748 K to understand the diffusion pathways and relaxation timescales of Na atom dynamics. The microscopic analysis of the QENS data has been performed using ab-initio and classical molecular dynamics simulations (MD) to understand the Na-ion diffusion in the amorphous phase. Our experimental studies show that the traditional model, such as the Hall and Ross (H-R) model, fairly well describe the diffusion in the amorphous phase giving a mean jump length of ~3 Å and residence time about 9.1 picoseconds. Our MD simulations have indicated that the diffusion of Na + ions occurs in the amorphous phase of Na2Si2O5 while that is not observed in the crystalline orthorhombic phase even up to 1100 K. The MD simulations have revealed that in the amorphous phase, due to different orientations of silicon polyhedral units, accessible pathways are opened up for Na + diffusions. These pathways are not available in the crystalline phase of Na2Si2O5 due to rigid spatial arrangement of silicon polyhedral units.

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“…The ionic transitional motion is enhanced 19,20 by rotational motion of transitionally static counter ions as found in the case of solid ionic conductor Li2SO4 17 .…”

Section: Introductionmentioning

confidence: 77%