Phase evolution and crystal growth of VO2 nanostructures under hydrothermal reactions

RSC Advances ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 7113-7120 ◽  
Author(s):  
Weilai Yu ◽  
Shuai Li ◽  
Chi Huang
Keyword(s):  
Crystal Growth ◽  
Phase Evolution ◽  
Hydrothermal Conditions ◽  
Hydrothermal Reactions ◽  
First Time

The phase evolution and crystal growth of VO2 nanostructures under hydrothermal conditions was comprehensively investigated and the feasibility of the Ostwald's step rules towards VO2 polymorph evolution was for the first time demonstrated.

scholarly journals Structure and formation mechanisms of (K0.46Na0.46La0.08)(Nb0.94Sb0.06)O3 particles under hydrothermal conditions

2020 ◽  
Vol 14 (4) ◽  
pp. 346-354
Author(s):  
Xingrui Li ◽  
Xinwei Shi
Keyword(s):  
Crystal Growth ◽  
Lattice Structure ◽  
Early Stage ◽  
Average Particle Size ◽  
Phase Evolution ◽  
Alkali Concentration ◽  
Formation Mechanisms ◽  
Average Particle ◽  
Hydrothermal Conditions ◽  
Layered Growth

(K0.46Na0.46La0.08)(Nb0.94Sb0.06)O3 powders were synthesized via hydrothermal method. The effects of different reaction conditions on crystal structure, micro-morphology and phase formation were analysed by XRD and SEM in detail. The results reveal that (K0.46Na0.46La0.08)(Nb0.94Sb0.06)O3 powders with orthorhombic lattice structure are synthesized at 200?C for 18 h with the total initial alkali concentration of 8mol/l. The average particle size of synthesized powders is about 500-700 nm, which has regular cubic morphology with uniform distribution. Moreover, doping with La3+ and Sb5+ inhibits the crystal growth. The phase evolution of the powders revealed that the hydrothermal synthesis of (K0.46Na0.46La0.08)(Nb0.94Sb0.06)O3 underwent two steps, where an intermediate product of K4Na4Nb6O19? 9H2O was found in the early stage at 140?C. Based on the results, the formation mechanism of (K0.46Na0.46La0.08)(Nb0.94Sb0.06)O3 powders was proposed. It can be inferred that the crystal growth model of (K0.46Na0.46La0.08)(Nb0.94Sb0.06)O3 is dissolution-crystal growth-recrystallization with the characteristics of layered growth.

Large-sized crystal growth and piezoelectric properties of the single crystals of LiNa5Mo9O30

CrystEngComm ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1912-1917
Author(s):  
Xiaoli Du ◽  
Fuan Liu ◽  
Zeliang Gao ◽  
Xiaojie Guo ◽  
Xiangmei Wang ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Crystal Growth ◽  
Single Crystals ◽  
Piezoelectric Properties ◽  
First Time ◽  
Octahedral Distortion

Single crystals of LiNa5Mo9O30 with seeds in the a-, b- and c-directions were successfully grown using the TSSG method. Full sets of dielectric, elastic and piezoelectric matrices of the crystal were determined first time. The octahedral distortion and dipole moment are calculated to explain the piezoelectric properties.

Topotactic route to synthesis of novel hydroxylated phases: I. Trioctahedral Micas

Clay Minerals ◽  
1986 ◽  
Vol 21 (2) ◽  
pp. 125-131 ◽  
Author(s):  
S. Komarneni ◽  
R. Roy
Keyword(s):  
Ion Exchange ◽  
Alkaline Earth ◽  
Water Molecules ◽  
Hydration Energy ◽  
Hydrothermal Conditions ◽  
Potential Applications ◽  
Clay Layers ◽  
First Time ◽  
Hydrolysis Of ◽  
Alkaline Earth Cations

AbstractK-depleted phlogopite mica was used as a topotactic precursor and treated with alkali (Li+, K+, , Rb+, Cs+), alkaline-earth (Mg2+, Ca2+, Sr2+, Ba2+) and trivalent (Al3+) cations under hydrothermal conditions of 200°C and 30 MPa pressure. K-, NH4-, Rb- and Cs-aluminosilicate micas were synthesised at 200°C in one day. The synthesis of Cs-aluminosilicate mica, with potential applications in the management of nuclear wastes, has been achieved for the first time by this approach. Ion exchange by Li+, Na+ and alkaline-earth cations under hydrothermal conditions did not produce anhydrous mica phases but resulted in hydrous phases with one or two layers of water molecules between the clay layers. The formation of hydrous phases may be attributed to the high hydration energy of the above cations compared to K+, , RB+ and Cs+. Ion exchange with Al3+ produced a chlorite-like phase because of the hydrolysis of Al3+ under these hydrothermal conditions. These studies are of relevance in the immobilization of wastes where hazardous ions can be fixed in highly stable insoluble phases like mica or chlorite.

scholarly journals Fabrication of C60Fullerene Nanofibers by Volatile Diffusion Method

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Bingzhe Wang ◽  
Xin Gao ◽  
Guangzhe Piao
Keyword(s):  
Crystal Growth ◽  
Self Assembly ◽  
Growth Process ◽  
Room Temperature ◽  
Isopropyl Alcohol ◽  
Diffusion Method ◽  
Short Fibers ◽  
Aspect Ratios ◽  
Crystal Growth Process ◽  
First Time

C60fullerene nanofibers (FNFs) were for the first time prepared by a volatile diffusion method using toluene as solvent and isopropyl alcohol as precipitation agent in room temperature, 25°C. FNFs with different lengths, aspect ratios, and morphologies could be fabricated by changing incubation time. Meanwhile, as for a crystal growth process, a possible mechanism of the formation of the crystal of FNFs was proposed in which the short and thin FNFs are the result of crystal growth, and self-assembly happens between the short fibers and thus leads to the formation of thick and long bundles of the FNFs.

Characteristic Comparison Between Ge-on-Insulator (GOI) and SI-on-Insulator (SOI) Beam-Induced Crystallization Mechanism

1986 ◽  
Vol 74 ◽  
Author(s):  
El-Hang Lee ◽  
M. Abdul Awal
Keyword(s):  
Crystal Growth ◽  
Crystallization Mechanism ◽  
Material Systems ◽  
Seeded Crystallization ◽  
First Time ◽  
Induced Crystallization ◽  
Traditional Understanding

AbstractCharacteristics of beam-recrystallized Si-on-insulator (SOT) and Ge-on-insulator (GOI) material systems are compared for the first time to gain complementary understanding of the crystallization mechanism that would benefit both systems. In general, GOI has been found to behave quite differently from SOI. In SOI, Si yields sub-boundaries; in GOI, Ge generates twinned or faceted crystals. In GOI, too, sub-boundary-like features were observed, but only occasionally in the midst of twinned crystals. Also observed in GOI was the phenomenon of seeded crystallization breakdown, where defect-free crystals from the seed abruptly turn into defect-laced crystals at a certain distance from the seed. This phenomenon is highly characteristic in SOI, but has never been reported for GOI. These findings are compared and discussed in light of the traditional understanding of crystal growth.

A surface-enhanced Raman scattering active core/shell structure based on enzyme-guided crystal growth for bisphenol A detection

2018 ◽  
Vol 10 (31) ◽  
pp. 3878-3883 ◽  
Author(s):  
Zhou Xu ◽  
Rong Wang ◽  
Bo Mei ◽  
Li Ding ◽  
Libing Wang ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Active Core ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
Bisphenol A Detection ◽  
First Time

Herein, a universal surface-enhanced Raman scattering (SERS) detection platform based on enzyme-guided crystal growth has been fabricated for the first time.

Perovskite CsPbBr3 crystals: growth and applications

2020 ◽  
Vol 8 (19) ◽  
pp. 6326-6341
Author(s):  
Jiaoxian Yu ◽  
Guangxia Liu ◽  
Chengmin Chen ◽  
Yan Li ◽  
Meirong Xu ◽  
...  
Keyword(s):  
Crystal Growth ◽  
First Time

This review for the first time systematically summarizes the latest research advances of perovskite CsPbBr3 crystal growth and its applications.

Single-crystal PbTiO3/PbZrO3 composite fibers formed by diffusion and epitaxial growth

CrystEngComm ◽  
2014 ◽  
Vol 16 (44) ◽  
pp. 10314-10320
Author(s):  
Tingting Yu ◽  
Zhaohui Ren ◽  
Shan Jiang ◽  
Siyu Gong ◽  
Ming Li ◽  
...  
Keyword(s):  
Single Crystal ◽  
Epitaxial Growth ◽  
Composite Fibers ◽  
Hydrothermal Conditions ◽  
First Time

Single-crystal PbTiO3/PbZrO3 (PT/PZ) composite fibers were prepared under hydrothermal conditions for the first time, which had an epitaxial growth relationship between single-crystal perovskite PT nanofibers and PZ crystals.

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