Nano-crystalline phase evolution and structural modification in Co/V substituted Li2O-Bi2O3-B2O3 glasses

2018 ◽  
Author(s):  
Arti Yadav ◽  
M. S. Dahiya ◽  
A. Hooda ◽  
A. Agarwal ◽  
S. Khasa
Keyword(s):  
Crystalline Phase ◽  
Structural Modification ◽  
Phase Evolution ◽  
Nano Crystalline

scholarly journals Mechanistic insight of KBiQ2 (Q = S, Se) using panoramic synthesis towards synthesis-by-design

2021 ◽  
Author(s):  
Rebecca McClain ◽  
Christos D. Malliakas ◽  
Jiahong Shen ◽  
Jiangang He ◽  
Chris Wolverton ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
Panoramic View ◽  
X Ray ◽  
Mechanistic Insight

This work uses in situ powder X-ray diffraction studies to observe crystalline phase evolution over the course of multiple K-Bi-Q (Q = S, Se) reactions, thereby constructing a “panoramic” view of each reaction from beginning to end.

Nonequilibrium Microstructures for Ag–Ni Nanowires

2015 ◽  
Vol 21 (2) ◽  
pp. 491-497 ◽  
Author(s):  
Rajesh K. Rai ◽  
Chandan Srivastava
Keyword(s):  
Crystalline Phase ◽  
Thermal Processing ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Phase Evolution ◽  
Peripheral Region ◽  
Axial Region ◽  
Amorphous Phases ◽  
Formation Kinetics ◽  
Nanocrystalline And Amorphous

AbstractThis work illustrates that a variety of nanowire microstructures can be obtained either by controlling the nanowire formation kinetics or by suitable thermal processing of as-deposited nanowires with nonequilibrium metastable microstructure. In the present work, 200-nm diameter Ag–Ni nanowires with similar compositions, but with significantly different microstructures, were electrodeposited. A 15 mA deposition current produced nanowires in which Ag-rich crystalline nanoparticles were embedded in a Ni-rich amorphous matrix. A 3 mA deposition current produced nanowires in which an Ag-rich crystalline phase formed a backbone-like configuration in the axial region of the nanowire, whereas the peripheral region contained Ni-rich nanocrystalline and amorphous phases. Isothermal annealing of the nanowires illustrated a phase evolution pathway that was extremely sensitive to the initial nanowire microstructure.

Phase Stability of Crystalline and Amorphous Phases and Formation of Nanostructure in Zr-Pd and Zr-Pt Alloys Under Electron Irradiation

2007 ◽  
Vol 1048 ◽  
Author(s):  
Yukichi Umakoshi ◽  
Takeshi Nagase ◽  
Takashi Hosokawa
Keyword(s):  
Electron Irradiation ◽  
Crystalline Phase ◽  
Amorphous State ◽  
Nano Composite ◽  
Phase Selection ◽  
Amorphous Phases ◽  
Nano Crystalline ◽  
Residual Amorphous Phase ◽  
Pt Alloys ◽  
Induced Crystallization

AbstractElectron irradiation induced phase transition behavior of Zr-Pd and Zr-Pt alloys was investigated focusing on phase selection in crystallization by thermal annealing and electron irradiation. Nano quasi-crystalline (QC) phase was formed by thermal crystallization in Zr66.7Pd33.3 and Zr80Pt20 alloys, while nano two-type f.c.c. super-saturated solid solutions were formed by irradiation induced crystallization at 298K. In Zr66.7Pt33.3 alloy, polycrystalline Zr5Pt3 and Zr9Pt11 phases transformed to two-type f.c.c. nano-crystalline phase through an amorphous state by crystal-to-amorphous-to-crystal (C-A-C) transition during electron irradiation. Nano-composite phase composed of f.c.c. super-saturated solid solution and residual amorphous phase was stable rather than an amorphous single phase, thermal equilibrium crystalline phase and quasi-crystalline phase under 2.0MV electron irradiation at 298K, resulting in the formation of nano-composite structure by irradiation induced amorphization and crystallization.

Pure Rutile Nano Crystalline Phase (Synthesis and Physical Properties)

2015 ◽  
Vol 3 (3) ◽  
pp. 229-232
Author(s):  
I. Kashif ◽  
H. Farouk ◽  
A. Ratep ◽  
M. Al Mahalawy
Keyword(s):  
Physical Properties ◽  
Crystalline Phase ◽  
Phase Synthesis ◽  
Nano Crystalline

Transparent Oxyfluoride Glass-Ceramics Containing CaF2 Nano-Crystalline Phase

2012 ◽  
Vol 512-515 ◽  
pp. 1015-1018 ◽  
Author(s):  
Zhao Xia Hou ◽  
Zhao Lu Xue ◽  
Shao Hong Wang ◽  
Xiao Dan Hu ◽  
Hao Ran Lu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Crystalline Phase ◽  
Tellurite Glass ◽  
Glass Ceramics ◽  
Xrd Analysis ◽  
Glassy Matrix ◽  
The Novel ◽  
X Ray Diffraction ◽  
Oxyfluoride Glass ◽  
Nano Crystalline

Transparent oxyfluoride tellurite glass with the composition of TeO2-SiO2-AlF3-CaO-KF system were prepared by conventional melting and annealing technique, and the transparent oxyfluoride glass-ceramics containing CaF2 nano-crystallines were obtained by controlled heat-treatment. The effect of heat-treatment schedules on the crystallization behavior and the microstructure of the glass-ceramics were analyzed by differential scanning caborimetry (DSC) analysis, X-ray diffraction (XRD) analysis, infrared (IR) spectrum and scanning electron microscopy (SEM). The sole CaF2 crystalline phase was confirmed by XRD, the spherical CaF2 nano-crystallines at about 20~100nm embed homogeneously among the glassy matrix after crystallization by SEM observation. The size of CaF2 grains grew with the increase of crystallization temperature and holding time. Te and Si atoms existed in [TeO3] and [SiO4] forms. Part of Al atoms existed in the form of [AlO4] and formed network together with [SiO4] tetrahedron. The other Al atoms acted as modifiers in the form of [AlO6]. The transmittance of glass-ceramics can reach 85% in visible light and 90% in infrared waveband. The novel transparent oxyfluoride tellurite glass-ceramics are excellent matrix materials in up-conversion luminescence field.

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