(CN)ONa<sub>3</sub>, Kristallstruktur und Natriumionenleitfähigkeit

Müller, Winfried; Jansen, Martin

doi:10.1002/zaac.19905910105

Cited by 21 publications

(23 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We noticed two previous reports on the ionic conductivity of antiperovskite Na 3 OBr and Na 3 OCN gave low values below their melting points [28,29]. In the present work, we demonstrated that both A-site size-mismatch substitution and unequivalent alkali-earth-metal doping could improve the ionic conducting performance remarkably.…”

Section: Sodium Ionic Conductivitysupporting

confidence: 50%

Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites

Wang

Liu

et al. 2015

Journal of Power Sources

114

167

View full text Add to dashboard Cite

h i g h l i g h t s g r a p h i c a l a b s t r a c tA series of Na-rich antiperovskites were developed as advanced solid electrolytes.The materials are nonflammable, low-cost and suitable for thermoplastic processing. Enhanced sodium ionic conductivity was achieved by structural manipulation approaches. The Na ionic conductivity of Na 2.9 Sr 0.05 OBr 0.6 I 0.4 reaches 1.9 Â 10 À3 S/cm at 200 C. a b s t r a c tHigh-performance solid electrolytes are critical for realizing all-solid-state batteries with enhanced safety and cycling efficiency. However, currently available candidates (sulfides and the NASICON-type ceramics) still suffer from drawbacks such as inflammability, high-cost and unfavorable machinability.Here we present the structural manipulation approaches to improve the sodium ionic conductivity in a series of affordable Na-rich antiperovskites. Experimentally, the whole solid solutions of Na 3 OX (X ¼ Cl, Br, I) are synthesized via a facile and timesaving route from the cheapest raw materials (Na, NaOH and NaX). The materials are nonflammable, suitable for thermoplastic processing due to low melting temperatures (<300 C) without decomposing. Notably, owing to the flexibility of perovskite-type structure, it's feasible to control the local structure features by means of size-mismatch substitution and unequivalent-doping for a favorable sodium ionic diffusion pathway. Enhancement of sodium ionic conductivity by 2 magnitudes is demonstrated by these chemical tuning methods. The optimized sodium ionic conductivity in Na 2.9 Sr 0.05 OBr 0.6 I 0.4 bulk samples reaches 1.9 Â 10 À3 S/cm at 200 C and even higher at elevated temperature. We believe further chemical tuning efforts on Na-rich antiperovskites will promote their performance greatly for practical all-solid state battery applications.

show abstract

Section: Sodium Ionic Conductivitysupporting

confidence: 50%

Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites

Wang

Liu

et al. 2015

Journal of Power Sources

114

167

View full text Add to dashboard Cite

show abstract

“…The variants obtained, like (NO,),ONa, (Fig, 6), are to be assigned the anti-K,NiF, structure, or like (CN)ONa, contain another disordered anion in place of NO; .I3', 33] The close relationship of these compounds is underscored by the mutual solubility[341 of BrONa,t351 and (NO,)ONa,.…”

mentioning

confidence: 98%

Volume Effect or Paddle‐Wheel Mechanism—Fast Alkali‐Metal Ionic Conduction in Solids with Rotationally Disordered Complex Anions

Jansen

1991

Angew. Chem. Int. Ed. Engl.

Self Cite

158

171

View full text Add to dashboard Cite

Dedicated to Professor Karl Heinz Buchel on the occasion of his 60th birthday Transport phenomena in the solid state are of equal importance in basic research and practice. In the past two decades particular interest has been directed towards so-called "fast" or "super" ionic conductors because of their attractive potential applications. We have synthesized highly conductive alkali-metal ionic conductors based on ionic crystals in which, on the one hand, high concentrations of the charge carriers can be realized by doping (point defects in the cation substructure) and, on the other, the activation energy of the interchange of sites is decreased by translationally fixed but rotationally mobile complex anions. Mixed crystals with Na,PO, or Na,AIF, structures have proven especially suitable in this connection. With the object of establishing a broader experimental foundation for clarifying the controversially discussed question of whether the higher free transport volume or the rotational motion of the anions is responsible for the high cation mobility in these rotary phases we have systematically varied the type of anions and concentration of defects and monitored the resulting changes in conduo tivity. Although the macroscopical characteristics investigated are not suitable for explaining mechanisms in detail at the atomic level, the results afford clear support for the assumption of a "paddle wheel mechanism"; but also effects of the enlarged transport volume are not to be disputed. Both these effects enhancing the cationic conductivity are concomitantly operative in amounts varying from system to system; they cannot be totally separated from each other.

show abstract

“…Therefore, the CN anions have to be either dynamically or statically disordered over six equivalent orientations, so that a volume and/or time average gives a cubic space group. 15 Contrary to the pure alkali cyanides, no temperature-induced phase transition has been observed in the temperature range from ambient conditions down to 120 K. As the observed atomic displacement factors of C and N were small, static disorder has been assumed. 15 The local symmetry breaking by static disorder raises the question of how the structure responds locally.…”

Section: Introductionmentioning

confidence: 96%

“…14 In contrast to the multitude of studies carried out on alkali cyanides, only few studies have been directed to understand whether trialkali oxide cyanides, where the structural aspects are quite similar, show a related behavior. According to single-crystal x-ray structure determinations Na 3 O͑CN͒ 15 and K 3 O͑CN͒ 16 crystallize in the antiperovskite structuretype with space group symmetry Pm3m (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Na3O(CN): Ab initiocalculations on a multidomain structure

Hantsch¹,

Winkler²,

Refson

et al. 2004

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

(CN)ONa₃, Kristallstruktur und Natriumionenleitfähigkeit

Cited by 21 publications

References 8 publications

Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites

Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites

Volume Effect or Paddle‐Wheel Mechanism—Fast Alkali‐Metal Ionic Conduction in Solids with Rotationally Disordered Complex Anions

Na3O(CN): Ab initiocalculations on a multidomain structure

Contact Info

Product

Resources

About

(CN)ONa3, Kristallstruktur und Natriumionenleitfähigkeit

Cited by 21 publications

References 8 publications

Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites

Structural manipulation approaches towards enhanced sodium ionic conductivity in Na-rich antiperovskites

Volume Effect or Paddle‐Wheel Mechanism—Fast Alkali‐Metal Ionic Conduction in Solids with Rotationally Disordered Complex Anions

Na3O(CN): Ab initiocalculations on a multidomain structure

Contact Info

Product

Resources

About

(CN)ONa₃, Kristallstruktur und Natriumionenleitfähigkeit