Is the olivine–spinel phase transformation martensitic?

Nature ◽  
1982 ◽  
Vol 298 (5872) ◽  
pp. 357-358 ◽  
Author(s):  
P. J. Vaughan ◽  
H. W. Green ◽  
R. S. Coe
Keyword(s):  
Phase Transformation ◽  
Spinel Phase

Improvement of the cyclic deterioration and structural evolution of Li[Li0.2Ni0.2Mn0.6]O2 cathode material by controlling initial charging voltages

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23677-23685 ◽  
Author(s):  
Wuwei Yan ◽  
Yongning Liu ◽  
Shaokun Chong ◽  
Yi-Fang Wu
Keyword(s):  
Phase Transformation ◽  
Cathode Material ◽  
Spinel Phase ◽  
Structural Evolution ◽  
Oxygen Release

The initial stepwise charging suppresses oxygen release and restrains the layered to spinel phase transformation.

TEM and Raman spectroscopy evidence of layered to spinel phase transformation in layered LiNi1/3Mn1/3Co1/3O2 upon cycling to higher voltages

2014 ◽  
Vol 733 ◽  
pp. 6-19 ◽  
Author(s):  
Prasant Kumar Nayak ◽  
Judith Grinblat ◽  
Mikhael Levi ◽  
Yan Wu ◽  
Bob Powell ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transformation ◽  
Spinel Phase

The Early Stages of the Spinel-Alumina Phase Transformation

1987 ◽  
Vol 94 ◽  
Author(s):  
Y. Kouh Simpson ◽  
C. B. Carter
Keyword(s):  
Electron Microscopy ◽  
Phase Transformation ◽  
Early Stage ◽  
Spinel Phase ◽  
High Resolution Electron Microscopy ◽  
Solid State Reactions ◽  
Alumina Phase ◽  
Transmission Electron ◽  
Resolution Electron ◽  
In Situ Experiments

ABSTRACTThe initial stage of topotactic growth of Ni-Al spinel into Al2O3 has been examined using transmission electron microscopy. A new experimental approach to the study of solid-state reactions, which may be adapted for in-situ experiments for low-temperature systems, has been used in this study. In its present form, the technique involves heating a thin film of one oxide in the presence of a vapor of the second oxide. In the study of the growth characteristics of Ni-Al spinel phase, the orientation of the Al2O3 substrate has been found to influence greatly both the structural and morphological aspects of the spinel growth. In particular, the topotactic relationship between the spinel and the alumina are very different for (0001) and {1120} substrate orientations. The very early stage of the kinetics of the spinel growth, in which the length and the width of the spinel particles are only a few hundred angstroms, is illustrated with the results obtained from the re-heating experiments. The structure of the spinel-alumina interface has also been studied using high-resolution electron microscopy. These results are discussed in relation to the different models proposed for the spinel-alumina phase transformation.

scholarly journals Atomic Insight into the Layered/Spinel Phase Transformation in Charged LiNi0.80Co0.15Al0.05O2 Cathode Particles

2017 ◽  
Vol 121 (3) ◽  
pp. 1421-1430 ◽  
Author(s):  
Hanlei Zhang ◽  
Khim Karki ◽  
Yiqing Huang ◽  
M. Stanley Whittingham ◽  
Eric A. Stach ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Spinel Phase ◽  
Insight Into

In situ observation of the olivine-spinel phase transformation in Fe2SiO4using synchrotron radiation

1987 ◽  
Vol 92 (B7) ◽  
pp. 6207 ◽  
Author(s):  
Takehiko Yagi ◽  
Masaki Akaogi ◽  
Osamu Shimomura ◽  
Toshihiro Suzuki ◽  
Syun-Iti Akimoto
Keyword(s):  
Phase Transformation ◽  
Synchrotron Radiation ◽  
Spinel Phase ◽  
In Situ Observation

Effects of the scale of precursor mixing on densification behaviors and phase-transformation kinetics of cordierite gels

1994 ◽  
Vol 9 (10) ◽  
pp. 2627-2633 ◽  
Author(s):  
Hyun M. Jang ◽  
Byung C. Lim
Keyword(s):  
Phase Transformation ◽  
Amorphous Silica ◽  
Single Phase ◽  
Spinel Phase ◽  
Silica Matrix ◽  
Nanometer Scale ◽  
Transformation Kinetics ◽  
Phase Transformation Kinetics ◽  
Molecular Scale ◽  
Kinetics Of

Effects of the scale of precursor mixing on densification behaviors and phase-transformation kinetics of multicomponent aluminosilicate gels were examined using cordierite gels prepared by two different processing routes: a monophasic (single phase) gel having molecular homogeneity, and a triphasic gel in which constitutive precursor phases are uniformly mixed in a nanometer scale (∼50 nm). In the case of the monophasic cordierite gel, homogeneous molecular-scale mixing of precursors induces a direction formation of μ-cordierite without a preceding crystallization, and the densification stops at the onset of crystallization to μ-cordierite at 960 °C. On the other hand, the densification of triphasic cordierite gel was not affected by the crystallization of intermediate spinel phase at 700 °C. The triphasic gel continues to densify until amorphous silica matrix crystallizes to quartz at 1180 °C. The enhanced densification observed in the triphasic gel was attributed to the retarded crystallization of amorphous silica component caused by the increase in diffusion distances.

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