Synthesis of a Li−Mn-oxide with Disordered Layer Stacking through Flocculation of Exfoliated MnO2Nanosheets, and Its Electrochemical Properties

2003 ◽  
Vol 15 (23) ◽  
pp. 4508-4514 ◽  
Author(s):  
Wang ◽  
Kazunori Takada ◽  
Akihisa Kajiyama ◽  
Mitsuko Onoda ◽  
Yuichi Michiue ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Mn Oxide ◽  
Layer Stacking ◽  
Disordered Layer

Effect of Heat Treatment on the Electrochemical Properties of Mn Oxide-Based Powder Prepared Using a Wet Chemical Process

2016 ◽  
Vol 8 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Woo Won Chun ◽  
Myung Sik Shin ◽  
Bit Na Choi ◽  
Aniu Qian ◽  
Jong Wook Bae ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrochemical Properties ◽  
Chemical Process ◽  
Mn Oxide ◽  
Wet Chemical

Complex Layer Stacking In Muscovite: A Hrtem Study

1999 ◽  
Vol 5 (S2) ◽  
pp. 152-153
Author(s):  
Chi Ma ◽  
George R. Rossman
Keyword(s):  
Electron Microscopy ◽  
Short Range ◽  
Analytical Electron Microscopy ◽  
Disordered Structures ◽  
Transmission Electron ◽  
Layer Structures ◽  
Layer Stacking ◽  
Disordered Layer ◽  
Sheet Silicate ◽  
First Time

One-, two- and three-layer polytypes are common in muscovite (sheet silicate). Based on high-resolution transmission electron microscopy (HRTEM) and analytical electron microscopy (AEM) examinations, we report in the discovery of complex 5-layer and 7- layer polytypes in natural muscovite for the first time (Fig. 1) and the implications of polytype transitions.Three main structures are found in muscovite crystals in a sample from Oreana, Nevada, which are 1M, 2M1, and a disordered structure often containing short-range ordered stacking sequences. On the scale of a few micrometers, muscovite occurs as ordered crystals, disordered crystals, and crystals with regions of ordered and disordered layer stacking.Short-range ordered 5- or 7-layer repeats are found in some disordered structures where single 4-, 6-, 9- or 10-layer intergrowths occur occasionally with 2- and 3-layer repeats. Such complex polytypes have not been observed before in either natural or synthetic muscovite, although 5- and 7-layer structures are commonly present in trioctahedral micas (i.e., biotite) (Baronnet, 1992).

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

Highly Luminescent 4-Pyridyl-Extended Dithieno[3,2-b:2′,3′-d]phospholes

2020 ◽  
Author(s):  
Thomas Baumgartner ◽  
Paul Demay-Drouhard
Keyword(s):  
Electrochemical Properties ◽  
Quantum Yields

The unexpectedly challenging synthesis of 4-pyridyl-extended dithienophospholes is reported. The optical and electrochemical properties of the phosphoryl-bridged species were studied experimentally and computationally, and their properties compared to their non-<i>P</i>-bridged congeners. The 4-pyridyl-extended dithieno-phospholes display quantitative luminescence quantum yields in solution.<br><br>

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