Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

23Na nuclear magnetic resonance study of yNa2S +(1-y)[xSiS2 + (1-x)PS5/2] glassy solid electrolytes

Journal Article · · Solid State Ionics
 [1];  [2];  [3];  [3];  [3]
  1. Minnesota State Univ., Moorhead, MN (United States); Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States); Central Research and Development, St. Paul, MN (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

23Na NMR spin lattice relaxation times, T1, and central linewidths were obtained for yNa2S +(1-y)[xSiS2 + (1-x)PS5/2] glassy solid electrolytes for two series of glasses, y=0.5 and 0.67, and x=0.1, 0.3, 0.5, 0.7, and 0.9. No pronounced mixed glass former effect in the activation energy was recorded within experimental uncertainty for either series of glasses. Energy barriers to sodium motion were calculated using the Anderson-Stuart model for the y=0.67 sample, and the results suggested that the energy barriers as a function of composition are strongly influenced by the dielectric constant of these glasses. DC Na+ ion conductivity values calculated using NMR-derived correlation times, an available Na+ ion site coordination number in the range z=3–4, and an energy cutoff determined from the critical percolation threshold, were in agreement with the increasing trend in the experimental values for the y=0.67 glasses. Using the same model, the conductivity values were calculated for the y=0.50 glasses, which have as yet to be measured, and these revealed a decreasing conductivity as x increased. Sodium NMR second moment studies showed that the cation spatial arrangement followed a homogeneous distribution for y=0.50 and 0.67 samples over most of the composition range, but deviated significantly away from this above a sodium concentration of 1.85 ×1028 m-3, implying a tendency for sodium to cluster under these conditions.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1542873
Alternate ID(s):
OSTI ID: 1532441
Report Number(s):
IS-J--9973
Journal Information:
Solid State Ionics, Journal Name: Solid State Ionics Journal Issue: C Vol. 340; ISSN 0167-2738
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (18)

FIGURE 1(p. 10)figure FIGURE 1
Table 1(p. 12)table Table 1
FIGURE 2(p. 13)figure FIGURE 2
FIGURE 3(p. 14)figure FIGURE 3
FIGURE 4(p. 15)figure FIGURE 4
Table 2(p. 16)table Table 2
FIGURE 5(p. 18)figure FIGURE 5
FIGURE 6(p. 19)figure FIGURE 6
FIGURE 7(p. 20)figure FIGURE 7
FIGURE 8(p. 22)figure FIGURE 8
FIGURE 9(p. 26)figure FIGURE 9
FIGURE 10(p. 28)figure FIGURE 10
FIGURE 11(p. 30)figure FIGURE 11
FIGURE 12(p. 32)figure FIGURE 12
FIGURE 13(p. 33)figure FIGURE 13
FIGURE 14(p. 37)figure FIGURE 14
FIGURE 15(p. 38)figure FIGURE 15
FIGURE 16(p. 39)figure FIGURE 16

Similar Records

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS