On Sr_1–xNa_xSiO_3–0.5x New Superior Fast Ion Conductors

Abstract

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Na+ mobility in sodium strontium silicate fast ion conductors

“…The consistency in the activation energy values found for the thermally activated process responsible for the averaging of the Na + ion environments by solid state NMR and the conduction process probed by impedance is strong evidence that the dominant charge carriers in the nominally Na-doped SrSiO 3 materials are in fact sodium ions in an amorphous Na 2 Si 2 O 5 phase. This conclusion is also consistent with previous findings based on high-resolution powder neutron diffraction and tracer diffusion measurements 4,5 , which show that although a very low level of oxygen vacancy creation in SrSiO 3 cannot be ruled out, the oxide ions are not responsible for high conductivity measured in these samples.…”

Structural elucidation of NASICON (Na3Al2P3O12) based glass electrolyte materials: effective influence of boron and gallium

“…27 It is known that to achieve greater conductivity (s ¼ cmq), in addition to increasing the concentration (c) and mobility (m) of the charge carriers, understanding the "structure" also plays a crucial role, and it should be considered as one of the key factors in designing the glass-based electrolyte material. 28,29 Very recently, glass and glass-ceramic bilayer sealants for solid oxide fuel cell applications have been developed by systematically varying the chemical composition of glasses through an understanding of the structure of glasses. 23 Among the various techniques, magic angle spinning-nuclear magnetic resonance (MAS-NMR) and micro-Raman confocal spectroscopies are reliable techniques for structural characterization of glass materials.…”

Amorphous Na2Si2O5 as a fast Na+ conductor: an ab initio molecular dynamics simulation

“…[1][2][3] Recently, a new family of oxides bearing a generic formula of Sr 1Àx A x SiO 3À0.5x (A ¼ Na, K) has been reported and immediately garnered much attention due to its high ionic conductivity, e.g. [8][9][10][11][12][13] These studies presented compelling evidence that the material was virtually a two-phase mixture, for example, consisting of a SrSiO 3 phase and an amorphous Na 2 Si 2 O 5 phase for the Sr 1Àx Na x SiO 3À0.5x system. [8][9][10][11][12][13] These studies presented compelling evidence that the material was virtually a two-phase mixture, for example, consisting of a SrSiO 3 phase and an amorphous Na 2 Si 2 O 5 phase for the Sr 1Àx Na x SiO 3À0.5x system.…”