Modeling of Shock Waves with Multiple Phase Transitions in Condensed Materials

Multiple phase transitions investigated by high-speed TEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100175880 ◽

1990 ◽

Vol 48 (4) ◽

pp. 550-551

Author(s):

Oleg Bostanjoglo ◽

Peter Thomsen-Schmidt

Keyword(s):

Phase Transitions ◽

High Speed ◽

Short Exposure ◽

Semiconductor Film ◽

Time Resolved ◽

Short Exposure Time ◽

Multiple Phase ◽

Model Substance ◽

History Of ◽

Electron Image

Thin GexTe1-x (x = 0.15-0.8) were studied as a model substance of a composite semiconductor film, in addition being of interest for optical storage material. Two complementary modes of time-resolved TEM were used to trace the phase transitions, induced by an attached Q-switched (50 ns FWHM) and frequency doubled (532 nm) Nd:YAG laser. The laser radiation was focused onto the specimen within the TEM to a 20 μm spot (FWHM). Discrete intermediate states were visualized by short-exposure time doubleframe imaging /1,2/. The full history of a transformation was gained by tracking the electron image intensity with photomultiplier and storage oscilloscopes (space/time resolution 100 nm/3 ns) /3/. In order to avoid radiation damage by the probing electron beam to detector and specimen, the beam is pulsed in this continuous mode of time-resolved TEM,too.Short events ( <2 μs) are followed by illuminating with an extended single electron pulse (fig. 1c)

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Hysteresis Abated P2-type NaCoO2 Cathode Reveals Highly Reversible Multiple Phase Transitions for High-Rate Sodium-ion Batteries

Sustainable Energy & Fuels ◽

10.1039/d1se00490e ◽

2021 ◽

Author(s):

VENKATA RAMI REDDY BODDU ◽

Manikandan Palanisamy ◽

Lichchhavi Sinha ◽

Subhash Yadav ◽

Vilas Pol ◽

...

Keyword(s):

Phase Transitions ◽

Discharge Rate ◽

Cycle Life ◽

Sodium Ion ◽

High Rate ◽

Sodium Ion Batteries ◽

Long Cycle Life ◽

Multiple Phase ◽

Ion Intercalation ◽

Charge Discharge

Despite multiple phase transitions occur during Na+ ion intercalation and deintercalation, enhanced charge-discharge rate, and long cycle life are achieved to hexagonal shaped P2-type NaCoO2 cathode for sodium-ion batteries (SIBs)....

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