scholarly journals Kinetically Stabilized Cation Arrangement in Li 3 YCl 6 Superionic Conductor during Solid‐State Reaction

2021 ◽  
pp. 2101413
Author(s):  
Hiroaki Ito ◽  
Kazuki Shitara ◽  
Yongming Wang ◽  
Kotaro Fujii ◽  
Masatomo Yashima ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Superionic Conductor ◽  
Cation Arrangement

scholarly journals Ultrahigh ionic conductivity in optimally sintered Li10.35Ge1.35P1.65S12 superionic conductor

2020 ◽  
Author(s):  
Hao Wen ◽  
Yue Jiang ◽  
Xingang Liu ◽  
Xiaohong Zhu ◽  
Chuhong Zhang
Keyword(s):  
Solid State ◽  
Ionic Conductivity ◽  
Solid State Reaction ◽  
Ionic Conductivities ◽  
Lithium Ion ◽  
Superionic Conductor ◽  
Conventional Solid State Reaction ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Order Of Magnitude

Abstract Lithium superionic conductor Li10+δGe1+δP2−δS12 has attracted tremendous interest for advanced all-solid-state lithium ion batteries due to extremely high ionic conductivity. However, the synthetic processes reported in literature are widely divergent, resulting in an order of magnitude difference in ionic conductivities of the same material, but as far as we know, the influence of synthetic conditions on ionic conductivity has not been studied yet. Herein, we systematically investigate the influence of sintering temperature on phase composition and ionic conductivity of the Li10+δGe1+δP2−δS12 compounds synthesized by conventional solid-state reaction for the first time. It is found that low and high sintering temperatures lead to a low crystallinity and the formation of impurity phases, respectively. As a result, the pure Li10.35Ge1.35P1.65S12, well crystallized in space group P42/nmc, is fabricated by optimization of the solid-state reaction temperature at 580 °C and its room temperature conductivity (19 mS cm− 1) is the highest among all existing Li10+δGe1+δP2−δS12 solid electrolytes. Meanwhile, the microstructure of Li10.35Ge1.35P1.65S12, being very dense and uniform, is demonstrated firstly by atomic force microscopy.

The wustite-spinel interface

1987 ◽  
Vol 45 ◽  
pp. 268-269
Author(s):  
S.R. Summerfelt ◽  
C.B. Carter
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Strain Energy ◽  
Matrix Material ◽  
Lattice Misfit ◽  
Solid State Reactions ◽  
Oxygen Sublattice ◽  
Large Particles ◽  
Small Lattice ◽  
Coherent Interfaces

The wustite-spinel interface can be viewed as a model interface because the wustite and spinel can share a common f.c.c. oxygen sublattice such that only the cations distribution changes on crossing the interface. In this study, the interface has been formed by a solid state reaction involving either external or internal oxidation. In systems with very small lattice misfit, very large particles (>lμm) with coherent interfaces have been observed. Previously, the wustite-spinel interface had been observed to facet on {111} planes for MgFe2C4 and along {100} planes for MgAl2C4 and MgCr2O4, the spinel then grows preferentially in the <001> direction. Reasons for these experimental observations have been discussed by Henriksen and Kingery by considering the strain energy. The point-defect chemistry of such solid state reactions has been examined by Schmalzried. Although MgO has been the principal matrix material examined, others such as NiO have also been studied.

Observation of solid-state reaction between a thin yttria film and a (0001) α-alumina substrate

1994 ◽  
Vol 52 ◽  
pp. 644-645
Author(s):  
J. R. Heffelfinger ◽  
C. B. Carter
Keyword(s):  
Electron Microscopy ◽  
Solid State ◽  
Solid State Reaction ◽  
Yttrium Aluminum Garnet ◽  
Secondary Phase ◽  
Ceramic Composites ◽  
Alumina Substrate ◽  
Transmission Electron ◽  
Alumina Fibers ◽  
Optical Applications

Transmission-electron microscopy (TEM), scanning-electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS) were used to investigate the solid-state reaction between a thin yttria film and a (0001) α-alumina substrate. Systems containing Y2O3 (yttria) and Al2O3 (alumina) are seen in many technologically relevant applications. For example, yttria is being explored as a coating material for alumina fibers for metal-ceramic composites. The coating serves as a diffusion barrier and protects the alumina fiber from reacting with the metal matrix. With sufficient time and temperature, yttria in contact with alumina will react to form one or a combination of phases shown by the phase diagram in Figure l. Of the reaction phases, yttrium aluminum garnet (YAG) is used as a material for lasers and other optical applications. In a different application, YAG is formed as a secondary phase in the sintering of AIN. Yttria is added to AIN as a sintering aid and acts as an oxygen getter by reacting with the alumina in AIN to form YAG.

PREDICTION OF GLASS FORMATION BY SOLID STATE REACTION IN ALLOYS

1990 ◽  
Vol 51 (C4) ◽  
pp. C4-111-C4-117 ◽  
Author(s):  
L. J. GALLEGO ◽  
J. A. SOMOZA ◽  
H. M. FERNANDEZ ◽  
J. A. ALONSO
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Glass Formation

X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

2013 ◽  
Vol 12 (10) ◽  
pp. 719-726
Author(s):  
R. Ayadi ◽  
Mohamed Boujelbene ◽  
T. Mhiri
Keyword(s):  
Solid State ◽  
General Formula ◽  
Vibrational Spectroscopy ◽  
Powder Diffraction ◽  
Infrared Spectra ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Unit Cell ◽  
Cell Group ◽  
X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

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