scholarly journals Infrared phonon spectroscopy on the Cairo pentagonal antiferromagnet Bi2Fe4O9 : A study through the pressure-induced structural transition

2021 ◽  
Vol 103 (17) ◽  
Author(s):  
M. Verseils ◽  
A. P. Litvinchuk ◽  
J-B. Brubach ◽  
P. Roy ◽  
K. Beauvois ◽  
...  
Keyword(s):  
Structural Transition

scholarly journals Mott Switching and Structural Transition in the Metal Phase of VO2 Nanodomain

2021 ◽  
Vol 3 (2) ◽  
pp. 605-610
Author(s):  
Chang-Yong Kim ◽  
Tetiana Slusar ◽  
Jinchul Cho ◽  
Hyun-Tak Kim
Keyword(s):  
Structural Transition ◽  
Metal Phase

Pressure-Induced Electronic and Structural Transition in Nodal-Line Semimetal ZrSiSe

2021 ◽  
Author(s):  
Enlai Dong ◽  
Ran Liu ◽  
Shifeng Niu ◽  
Xuan Luo ◽  
Kuo Hu ◽  
...  
Keyword(s):  
Structural Transition ◽  
Nodal Line

Tuning the magnetic properties of V2O3/CoFeB heterostructures across the V2O3 structural transition

2021 ◽  
Vol 5 (3) ◽  
Author(s):  
V. Polewczyk ◽  
S. K. Chaluvadi ◽  
P. Orgiani ◽  
G. Panaccione ◽  
G. Vinai ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Structural Transition

scholarly journals UV-induced interstrand cross-linking of d(GT)n.d(CA)n is facilitated by a structural transition.

1986 ◽  
Vol 261 (22) ◽  
pp. 10051-10057
Author(s):  
J D Love ◽  
H T Nguyen ◽  
A Or ◽  
A K Attri ◽  
K W Minton
Keyword(s):  
Structural Transition ◽  
Cross Linking

scholarly journals Anion ordering enables fast H− conduction at low temperatures

2021 ◽  
Vol 7 (23) ◽  
pp. eabf7883
Author(s):  
Hiroki Ubukata ◽  
Fumitaka Takeiri ◽  
Kazuki Shitara ◽  
Cédric Tassel ◽  
Takashi Saito ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Structural Transition ◽  
Hexagonal Lattice ◽  
Ionic Conductors ◽  
Activation Barriers ◽  
Energy Devices ◽  
Energy Applications ◽  
Chemical Disorder ◽  
New Energy

The introduction of chemical disorder by substitutional chemistry into ionic conductors is the most commonly used strategy to stabilize high-symmetric phases while maintaining ionic conductivity at lower temperatures. In recent years, hydride materials have received much attention owing to their potential for new energy applications, but there remains room for development in ionic conductivity below 300°C. Here, we show that layered anion-ordered Ba2−δH3−2δX (X = Cl, Br, and I) exhibit a remarkable conductivity, reaching 1 mS cm−1 at 200°C, with low activation barriers allowing H− conduction even at room temperature. In contrast to structurally related BaH2 (i.e., Ba2H4), the layered anion order in Ba2−δH3−2δX, along with Schottky defects, likely suppresses a structural transition, rather than the traditional chemical disorder, while retaining a highly symmetric hexagonal lattice. This discovery could open a new direction in electrochemical use of hydrogen in synthetic processes and energy devices.

scholarly journals Dislocation-mediated shear amorphization in boron carbide

2021 ◽  
Vol 7 (8) ◽  
pp. eabc6714 ◽  
Author(s):  
Kolan Madhav Reddy ◽  
Dezhou Guo ◽  
Shuangxi Song ◽  
Chun Cheng ◽  
Jiuhui Han ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Structural Transition ◽  
Activation Volume ◽  
Structural Evolution ◽  
Dislocation Nucleation ◽  
Superhard Materials ◽  
Rate Dependent ◽  
Transmission Electron ◽  
Lower Activation ◽  
Underlying Mechanisms

The failure of superhard materials is often associated with stress-induced amorphization. However, the underlying mechanisms of the structural evolution remain largely unknown. Here, we report the experimental measurements of the onset of shear amorphization in single-crystal boron carbide by nanoindentation and transmission electron microscopy. We verified that rate-dependent loading discontinuity, i.e., pop-in, in nanoindentation load-displacement curves results from the formation of nanosized amorphous bands via shear amorphization. Stochastic analysis of the pop-in events reveals an exceptionally small activation volume, slow nucleation rate, and lower activation energy of the shear amorphization, suggesting that the high-pressure structural transition is activated and initiated by dislocation nucleation. This dislocation-mediated amorphization has important implications in understanding the failure mechanisms of superhard materials at stresses far below their theoretical strengths.

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