scholarly journals Ionic conduction in Li3Na(NH2)4: Study of the material design for the enhancement of ion conductivity in double-cation complex hydrides

AIP Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 055109 ◽  
Author(s):  
Biswajit Paik ◽  
Hiroyuki Oguchi ◽  
Toyoto Sato ◽  
Shigeyuki Takagi ◽  
Arunkumar Dorai ◽  
...  
Keyword(s):  
Ionic Conduction ◽  
Material Design ◽  
Ion Conductivity ◽  
Complex Hydrides ◽  
Cation Complex

Lithium ion conductivity of complex hydrides incorporating multiple closo‑type complex anions

2019 ◽  
Vol 38 ◽  
pp. 84-87 ◽  
Author(s):  
Naoki Toyama ◽  
Sangryun Kim ◽  
Hiroyuki Oguchi ◽  
Toyoto Sato ◽  
Shigeyuki Takagi ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Ion Conductivity ◽  
Type Complex ◽  
Complex Hydrides ◽  
Lithium Ion Conductivity ◽  
Complex Anions

Transition Metal D$ LaGaO3 Perovskite Fast Oxide Ion Conductor and Intermediate Temperature Solid Oxide Fuel Cell

1999 ◽  
Vol 575 ◽  
Author(s):  
Tatsumi Ishihara ◽  
Takaaki Shibayama ◽  
Miho Honda ◽  
Hiroyasu Nishiguchi ◽  
Yusaku Takita
Keyword(s):  
Transition Metal ◽  
Power Density ◽  
Ionic Conduction ◽  
Ion Conductivity ◽  
Large Power ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Wide Range ◽  
Oxide Ion

ABSTRACTDoping transition metal cation is known to enhance the electric conduction of solid electrolytes, however, the ionic conduction can be improved by doping the small amount of transition metal, in particular, doping Co is effective for improving the oxide ion conductivity. In this investigation, oxide ion conductivity of LaGaO3 based oxide doped with Co were investigated in detail. It was found that LaGaO3 doped with Co for Ga site (LSGMC) show a notable oxide ion conductivity over a wide range of oxygen partial pressures, although a hole conduction was appeared by addition of excess amount of Co. Considering the electrical conductivity and transport number of oxide ion, the optimized composition of LSGMC seems to be existed at La0.8.Sr0.2, Ga0.8,.Mg0.115 CO0.085O3. Power generation characteristics of fuel cells was greatly improved by using LSGMC for electrolyte and extremely large power density can be obtained on both H2- O2 and H2-air cells. In particular, the maximum power density was attained to a value of 1.53 and 0.50 W/cm2 at 1073 and 873 K, respectively, on H2–O2 cell when the thickness of electrolyte was 0.18 mm. Furthermore, almost similar large power density was attained when air was used as oxidant. The high power density of cell demonstrated in this study suggests that the operating temperature of SOFC can be decreased by using LSGMC for electrolyte.

scholarly journals Combined DFT and geometrical–topological analysis of Li-ion conductivity in complex hydrides

2020 ◽  
Vol 7 (17) ◽  
pp. 3115-3125
Author(s):  
Valerio Gulino ◽  
Anna Wolczyk ◽  
Andrey A. Golov ◽  
Roman A. Eremin ◽  
Mauro Palumbo ◽  
...  
Keyword(s):  
Topological Analysis ◽  
Ion Conductivity ◽  
Complex Hydrides ◽  
Li Ion

This work suggests that topological analysis can adequately explain the ion conductivity in complex hydrides.

Sodium and magnesium ionic conduction in complex hydrides

2013 ◽  
Vol 580 ◽  
pp. S98-S101 ◽  
Author(s):  
Motoaki Matsuo ◽  
Hiroyuki Oguchi ◽  
Toyoto Sato ◽  
Hitoshi Takamura ◽  
Eiji Tsuchida ◽  
...  
Keyword(s):  
Ionic Conduction ◽  
Complex Hydrides

Sodium ionic conduction in complex hydrides with [BH4]− and [NH2]− anions

2012 ◽  
Vol 100 (20) ◽  
pp. 203904 ◽  
Author(s):  
Motoaki Matsuo ◽  
Shingo Kuromoto ◽  
Toyoto Sato ◽  
Hiroyuki Oguchi ◽  
Hitoshi Takamura ◽  
...  
Keyword(s):  
Ionic Conduction ◽  
Complex Hydrides

Stress-Induced Ordering in Y203-Stabilized Tetragonal Zr02

1985 ◽  
Vol 43 ◽  
pp. 222-223
Author(s):  
J. Y. Koo ◽  
M. P. Anderson
Keyword(s):  
Electron Diffraction ◽  
Ionic Conduction ◽  
Electron Diffraction Study ◽  
Ceramic Materials ◽  
Bright Field Image ◽  
Transformation Toughening ◽  
Ion Milling ◽  
Thin Foils ◽  
Carbon Coated ◽  
Convergent Beam

Tetragonal Zr02 has been used as a toughening phase in a large number of ceramic materials. In this system, complex diffraction phenomena have been observed and an understanding of the origin of the diffraction effects provides important information on the nature of transformation toughening, ionic conduction, and phase destabilization. This paper describes the results of an electron diffraction study of Y203-stabilized, tetragonal Zr02 polycrystals (Y-TZP).Thin foils from the bulk Y-TZP sample were prepared by careful grinding and cryo ion-milling. They were carbon coated and examined in a Philips 400T/FEG microscope. Fig. 1 shows a typical bright field image of the 100% tetragonal(t) Zr02. The tetragonal structure was identified by both bulk x-ray diffraction and convergent beam electron diffraction (Fig. 2. A local region within a t-Zr02 grain was subjected to an intense electron beam irradiation which caused partial martensitic transformation of the t-Zr02 to monoclinic(m) symmetry, Fig. 3 A.

A transmission electron microscopic study of structural transitions in fast ionic conductors

1987 ◽  
Vol 45 ◽  
pp. 156-157
Author(s):  
R. B. Queenan ◽  
P. K. Davies
Keyword(s):  
Optical Properties ◽  
Ionic Conduction ◽  
Recent Observation ◽  
Ionic Conductivities ◽  
Sodium Aluminate ◽  
Two Dimensions ◽  
Ionic Conductors ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Trivalent Cations

Na ß“-alumina (Na1.67Mg67Al10.33O17) is a non-stoichiometric sodium aluminate which exhibits fast ionic conduction of the Na+ ions in two dimensions. The Na+ ions can be exchanged with a variety of mono-, di-, and trivalent cations. The resulting exchanged materials also show high ionic conductivities.Considerable interest in the Na+-Nd3+-ß“-aluminas has been generated as a result of the recent observation of lasing in the pulsed and cw modes. A recent TEM investigation on a 100% exchanged Nd ß“-alumina sample found evidence for the intergrowth of two different structure types. Microdiffraction revealed an ordered phase coexisting with an apparently disordered phase, in which the cations are completely randomized in two dimensions. If an order-disorder transition is present then the cooling rates would be expected to affect the microstructures of these materials which may in turn affect the optical properties. The purpose of this work was to investigate the affect of thermal treatments upon the micro-structural and optical properties of these materials.

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