Improved ionic conductivity and structural transition from (nLi2S-LiI)-(P2S5) solid solutions to LixP2SyI crystalline electrolytes

2021 ◽  
pp. 163435
Author(s):  
Rajesh Rajagopal ◽  
Yuvaraj Subramanian ◽  
Gaeun Hwang ◽  
Yu Jin Jung ◽  
Kwang-Sun Ryu
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions ◽  
Structural Transition

scholarly journals Anion ordering enables fast H− conduction at low temperatures

2021 ◽  
Vol 7 (23) ◽  
pp. eabf7883
Author(s):  
Hiroki Ubukata ◽  
Fumitaka Takeiri ◽  
Kazuki Shitara ◽  
Cédric Tassel ◽  
Takashi Saito ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Structural Transition ◽  
Hexagonal Lattice ◽  
Ionic Conductors ◽  
Activation Barriers ◽  
Energy Devices ◽  
Energy Applications ◽  
Chemical Disorder ◽  
New Energy

The introduction of chemical disorder by substitutional chemistry into ionic conductors is the most commonly used strategy to stabilize high-symmetric phases while maintaining ionic conductivity at lower temperatures. In recent years, hydride materials have received much attention owing to their potential for new energy applications, but there remains room for development in ionic conductivity below 300°C. Here, we show that layered anion-ordered Ba2−δH3−2δX (X = Cl, Br, and I) exhibit a remarkable conductivity, reaching 1 mS cm−1 at 200°C, with low activation barriers allowing H− conduction even at room temperature. In contrast to structurally related BaH2 (i.e., Ba2H4), the layered anion order in Ba2−δH3−2δX, along with Schottky defects, likely suppresses a structural transition, rather than the traditional chemical disorder, while retaining a highly symmetric hexagonal lattice. This discovery could open a new direction in electrochemical use of hydrogen in synthetic processes and energy devices.

Ionic Conductivity of Solid Solutions and Composites Based on Sm2W3O12

2020 ◽  
Vol 56 (5) ◽  
pp. 447-451
Author(s):  
A. F. Guseva ◽  
N. N. Pestereva ◽  
E. L. Vostrotina ◽  
D. D. Otcheskikh ◽  
D. A. Lopatin
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions

ChemInform Abstract: Chemical Transport of Solid Solutions. Part 8. Transport Phenomena and Ionic Conductivity in the In2O3/SnO2 System.

ChemInform ◽  
2001 ◽  
Vol 32 (5) ◽  
pp. no-no
Author(s):  
Greta R. Patzke ◽  
Michael Binnewies ◽  
Ulrich Nigge ◽  
Hans-Dieter Wiemhoefer
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions ◽  
Transport Phenomena ◽  
Chemical Transport

Ionic conductivity of Li x Na1 − x Ta y Nb1 − y O3 solid solutions

2013 ◽  
Vol 49 (6) ◽  
pp. 595-601 ◽  
Author(s):  
N. V. Sidorov ◽  
M. N. Palatnikov ◽  
N. A. Teplyakova ◽  
E. Yu. Obryadina ◽  
V. V. Efremov
Keyword(s):  
Ionic Conductivity ◽  
Solid Solutions

The Solid Solutions (Ce1-xLax)RuSn

2013 ◽  
Vol 68 (12) ◽  
pp. 1279-1287 ◽  
Author(s):  
Oliver Niehaus ◽  
Bernard Chevalier ◽  
Paula M. Abdala ◽  
Florian Winter ◽  
Rainer Pöttgen
Keyword(s):  
Single Crystal ◽  
Solid Solutions ◽  
Structural Transition ◽  
Magnetic Ordering ◽  
Site Symmetry ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Resistivity Measurements ◽  
Cooperative Phenomena ◽  
Lanthanum Content

X-Ray-pure samples of the solid solutions (Ce1-xLax)RuSn were obtained up to x=0.5. Powder diffraction data show the CeRuSn-type superstructure up to x ≈ 0:3 and the CeCoAl-type subcell for higher lanthanum contents. The structure of a single crystal with x=0.5 was refined on the basis of single-crystal X-ray diffractometer data: CeCoAl type, C2=m, a=1160.8(2), b=477.6(1), c=511.6(1) pm, β = 102:97(2)°, wR=0.0510, 444 F2 values, 20 variables. Magnetic investigations were performed for all samples up to a lanthanum content of x=0.4. No cooperative phenomena could be observed, and all samples show Curie-Weiss behavior above a certain temperature. The cerium valence is about 3.32(2) for all samples of the solid solution. Hence, La3+ has to replace Ce3+ as well as Ce4+ in a particular quantity. The electrical resistivity measurements confirm the suppression of the magnetic ordering and the structural transition upon replacement of cerium by lanthanum. 119Sn Mössbauer spectra of samples with x=0.2 and 0.5 are indicative of single tin sites with isomer shifts of δ =1.86(1)mm s-1 for x=0.2 and δ =1.88(1)mm s-1 for x=0.5. Both signals are subject to significant quadrupole splitting, a consequence of the low site symmetry. Results of XANES measurements are perfectly in line with the cerium valences determined by susceptibility measurements and yield a constant value of 3.16(1) for all investigated compounds

Some Structural Aspects of Ionic Conductivity in Co-Doped Ceria-Based Electrolytes

2013 ◽  
Vol 58 (4) ◽  
pp. 1355-1359 ◽  
Author(s):  
M. Dudek
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Solid Solutions ◽  
Transference Number ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Co Doped

Abstract The sinters of co-doped ceria solid solutions with the formula of Ce0.85Sm0.15-x RxO1.9, where R = Y, Gd, Pr, Tb, Ox-0.15, were obtained from powders synthesised by Pechini method. The linear variation of cell parameter a vs. chemical composition was observed for Ce0.85Sm0:15-xRxO1.9, where R = Y, Gd, Tb, 0 <x<0.15 samples. However, the introduction of Pr3+ into Ce0.85Sm0.15-x PrxO1.9 caused a small deviation from linearity due to possible changes in the valence from Pr3+ to Pr4+. The determined values of oxide transference number tion for Ce0.85Sm0.15-xRxO1.9, R = Y, Gd in the temperature range 400-750°C and partial oxygen pressure from 10-6 to 1 atm were close to 1, which indicated that materials investigated exhibited practically pure ionic oxide conductivity. On the other hand, the introduction of Tb3+ or Pr3+ higher than x>0.05 into solid solution Ce0.85Sm0.15-xRxO1.9, R = Tb, Pr caused a decrease in the ionic transference number tion below 1 due to an increase in partial electronic conduction. This fact limiting investigated co-doped terbia and samaria or samaria and praseodymia ceria-based solid solutions for the further application as oxide electrolytes in solid oxide fuel cells. The analysis of bulk and grain boundary values indicated that partial substitution of Sm3+ by Y3+ or Gd3+ caused slight improvements in the ionic conductivity of Ce0.85Sm0.15-xRxO1.9. The highest ionic conductivity was found for solid solution with chemical composition Ce0.85Sm0.1Y0.05O1.9. The selected co-doped ceria samples were tested as solid electrolytes in solid oxide fuel cells operating in the intermediate temperature range 500-750°C.

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