scholarly journals Switching between solid solution and two-phase regimes in the Li1-xFe1-yMnyPO4 cathode materials during lithium (de)insertion: combined PITT, in situ XRPD and electron diffraction tomography study

2016 ◽  
Vol 191 ◽  
pp. 149-157 ◽  
Author(s):  
Oleg A. Drozhzhin ◽  
Vasiliy D. Sumanov ◽  
Olesia M. Karakulina ◽  
Artem M. Abakumov ◽  
Joke Hadermann ◽  
...  
Keyword(s):  
Solid Solution ◽  
Electron Diffraction ◽  
Cathode Materials ◽  
Diffraction Tomography ◽  
Two Phase

Microstructures and Mechanical Properties of NiAl+Mo In-Situ Eutectic Composites

1990 ◽  
Vol 194 ◽  
Author(s):  
P. R. Subramanian ◽  
M. G. Mendiratta ◽  
D. B. Miracle ◽  
D. M. Dimiduk
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Room Temperature ◽  
Composite System ◽  
Elevated Temperatures ◽  
Two Phase ◽  
Structural Applications ◽  
Temperature Fracture

AbstractThe quasibinary NiAI-Mo system exhibits a large two-phase field between NiAl and the terminal (Mo) solid solution, and offers the potential for producing in-situ eutectic composites for high-temperature structural applications. The phase stability of this composite system was experimentally evaluated, following long-term exposures at elevated temperatures. Bend strengths as a function of temperature and room-temperature fracture toughness data are presented for selected NiA1-Mo alloys, together with results from fractography observations.

scholarly journals Структурные фазовые превращения при твердофазной реакции в двухслойной тонкопленочной наносистеме Al/Fe

2020 ◽  
Vol 62 (1) ◽  
pp. 158
Author(s):  
Р.Р. Алтунин ◽  
Е.Т. Моисеенко ◽  
С.М. Жарков
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Electron Diffraction ◽  
Phase Formation ◽  
Solid State Reaction ◽  
Intermetallic Phases ◽  
Formation Processes

Phase formation processes at a solid state reaction between Fe and Al nanolayers were studied using in situ electron diffraction. The process of solid state reaction on the interface of the Fe and Al nanolayers was established to begin at ≈100 °C with the formation of a disordered solid solution of Al in a-Fe. It was shown that in the process of further heating, intermetallic phases of FeAl6 and/or Fe2Al5, FeAl, Fe3Al were successively formed.

Structure solution and refinement of metal-ion battery cathode materials using electron diffraction tomography

2019 ◽  
Vol 75 (4) ◽  
pp. 485-494 ◽  
Author(s):  
Joke Hadermann ◽  
Artem M. Abakumov
Keyword(s):  
Electron Diffraction ◽  
Cathode Materials ◽  
Metal Ion ◽  
Structural Changes ◽  
Liquid Electrolyte ◽  
Ex Situ ◽  
Diffraction Tomography ◽  
Transmission Electron ◽  
Structure Solution ◽  
Electrochemical Cycling

The applicability of electron diffraction tomography to the structure solution and refinement of charged, discharged or cycled metal-ion battery positive electrode (cathode) materials is discussed in detail. As these materials are often only available in very small amounts as powders, the possibility of obtaining single-crystal data using electron diffraction tomography (EDT) provides unique access to crucial information complementary to X-ray diffraction, neutron diffraction and high-resolution transmission electron microscopy techniques. Using several examples, the ability of EDT to be used to detect lithium and refine its atomic position and occupancy, to solve the structure of materials ex situ at different states of charge and to obtain in situ data on structural changes occurring upon electrochemical cycling in liquid electrolyte is discussed.

scholarly journals Quantitative electron diffraction tomography for the structure solution of cathode materials for Li-ion batteries

2016 ◽  
pp. 790-791
Author(s):  
Olesia Karakulina ◽  
Stanislav Fedotov ◽  
Vasiliy Sumanov ◽  
Oleg Drozhzhin ◽  
Nellie Khasanova ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Cathode Materials ◽  
Diffraction Tomography ◽  
Li Ion Batteries ◽  
Structure Solution ◽  
Li Ion

scholarly journals Electron Diffraction Tomography Measurement of Defect Distribution Produced by In Situ Ion Irradiation in Thin Foil

2010 ◽  
Vol 16 (S2) ◽  
pp. 1608-1609 ◽  
Author(s):  
M Kirk ◽  
M Li ◽  
P Baldo
Keyword(s):  
Electron Diffraction ◽  
Ion Irradiation ◽  
Thin Foil ◽  
Diffraction Tomography ◽  
Defect Distribution

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

6Li and 7Li MAS NMR and In Situ X-ray Diffraction Studies of Lithium Manganate Cathode Materials

1998 ◽  
Vol 548 ◽  
Author(s):  
Young Joo Lee ◽  
Francis Wang ◽  
Clare P. Grey ◽  
Sanjeev Mukerjee ◽  
James McBreen
Keyword(s):  
Cathode Materials ◽  
Nmr Spectra ◽  
Manganese Oxides ◽  
Mas Nmr ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Lithium Manganese Oxides ◽  
Diffraction Patterns

ABSTRACT6Li MAS NMR spectra of lithium manganese oxides with differing manganese oxidation states (LiMn2O4, Li4Mn5O12, Li2Mn4O9, and Li2Mn2O4) are presented. Improved understanding of the lithium NMR spectra of these model compounds is used to interpret the local structure of the LixMn2O4 cathode materials following electrochemical Li+ deintercalation to various charging levels. In situ x-ray diffraction patterns of the same material during charging are also reported for comparison. Evidence for two-phase behavior for x < 0.4 (LixMn2O4) is seen by both NMR and diffraction.

Transition alpha structure in beta-isomorphous Nb-Hf alloys

1987 ◽  
Vol 45 ◽  
pp. 232-233
Author(s):  
R.W. Carpenter ◽  
Changhai Li ◽  
David J. Smith
Keyword(s):  
Solid Solution ◽  
Solution Phase ◽  
Miscibility Gap ◽  
Large Strains ◽  
Solid Solution Phase ◽  
Two Phase ◽  
Diffuse Intensity ◽  
Metastable Form ◽  
The Matrix ◽  
Equilibrium Morphology

Binary Nb-Hf alloys exhibit a wide bcc solid solution phase field at temperatures above the Hfα→ß transition (2023K) and a two phase bcc+hcp field at lower temperatures. The β solvus exhibits a small slope above about 1500K, suggesting the possible existence of a miscibility gap. An earlier investigation showed that two morphological forms of precipitate occur during the bcc→hcp transformation. The equilibrium morphology is rod-type with axes along <113> bcc. The crystallographic habit of the rod precipitate follows the Burgers relations: {110}||{0001}, <112> || <1010>. The earlier metastable form, transition α, occurs as thin discs with {100} habit. The {100} discs induce large strains in the matrix. Selected area diffraction examination of regions ∼2 microns in diameter containing many disc precipitates showed that, a diffuse intensity distribution whose symmetry resembled the distribution of equilibrium α Bragg spots was associated with the disc precipitate.

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