Band Gap Tuning and ac Conductivity of Nanocrystalline Nickel Doped ZnO Synthesized by High Energy Ball Milling

2018 ◽  
Vol 24 (8) ◽  
pp. 5669-5672
Author(s):  
Bikram Keshari Das ◽  
Tanushree Das ◽  
Kajal Parashar ◽  
S. K. S Parashar
Keyword(s):  
Band Gap ◽  
Ball Milling ◽  
Ac Conductivity ◽  
Average Crystallite Size ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Ni Doping ◽  
Vis Spectroscopy ◽  
Energy Ball ◽  
Doped Zno

In the present work, Ni doped ZnO nanoparticles (Zn1−xNixO, x = 0,0.01) has been synthesized by High Energy Ball Milling technique. The synthesized nanoparticles have been characterized by XRD, UV-Vis spectroscopy and LCR meter. The XRD studies revealed that the synthesized nanoparticles are single phase, hexagonal wurtize structure and belongs to a space group of P63 mc. There is shifting of most intense XRD peaks toward higher diffraction angle with Ni doping. The lattice parameter and average crystallite size decreases with Ni doping. Doping of Ni reduces the band gap of ZnO. This is attributed to the sp-d exchange interaction between the ZnO band electrons and localized d electrons of Ni2+ ions. The ac conductivity increases with increase in temperature and frequency, but the value decreases with Ni doping.

High-Energy Ball Milling Conditions in Formation of NiTiCu Shape Memory Alloys

2021 ◽  
pp. 1-7
Author(s):  
Tomasz Goryczka ◽  
Piotr Salwa ◽  
Maciej Zubko
Keyword(s):  
Chemical Composition ◽  
Shape Memory ◽  
Crystallite Size ◽  
Ball Milling ◽  
Average Crystallite Size ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Average Size ◽  
Grinding Time

The properties and the shape memory effect depend, among other things, on chemical composition, as well as the method of shape memory alloy (SMA) production. One of the manufacturing methods that leads to the amorphous/nanocrystalline SMA is high-energy ball milling combined with annealing. Using this technique, an SMA memory alloy, with the nominal chemical composition of Ni25Ti50Cu25, was produced from commercial elemental powders (purity −99.7%). The structure and morphology were characterized (at the various stages of its production) by the use of X-ray diffraction, as well as electron microscopy (both scanning and transmission). Choosing the appropriate grinding time made it possible to produce an NiTiCu alloy with a different crystallite size. Its average size changed from 6.5 nm (after 50 h) to about 2 nm (100 h). Increasing the grinding time up to 140 h resulted in the formation of areas that showed the B19 martensite and the Ti2(Ni,Cu) phase with the average crystallite size of about 6 nm (as milled). After crystallization, the average size increased to 11 nm.

High Energy Planetary Ball Milling of SiC Powders

2007 ◽  
Vol 351 ◽  
pp. 7-14 ◽  
Author(s):  
Yu Bai Pan ◽  
Zheng Ren Huang ◽  
Dong Liang Jiang ◽  
Léo Mazerolles ◽  
D. Michel ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Ball Milling ◽  
Average Crystallite Size ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Fine Powders ◽  
Sic Ceramics ◽  
Sem And Tem ◽  
Planetary Ball Milling ◽  
Energy Ball

The effects of high-energy ball milling on SiC powders were studied using a planetary apparatus. Conditions to obtain nanostructured SiC powders with an average crystallite size of 4 nm were determined and powders were characterized by XRD, SEM and TEM analyses. This process was applied to prepare fine powders leading to dense SiC ceramics by sintering at 1900oC for 30 minutes under 30 MPa in argon.

Investigation of structural, morphological and NTCR behaviour of Cu-doped ZnO nanoceramics synthesized by high energy ball milling

2019 ◽  
Vol 221 ◽  
pp. 419-429 ◽  
Author(s):  
Bikram Keshari Das ◽  
Tanushree Das ◽  
Kajal Parashar ◽  
S.K.S. Parashar ◽  
Rajeev Kumar ◽  
...  
Keyword(s):  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Doped Zno

Microstructure and Electrical Properties of Er2O3-Doped ZnO-Based Varistor Ceramics Prepared by High-Energy Ball Milling

2007 ◽  
Vol 25 (1) ◽  
pp. 120-123 ◽  
Author(s):  
Liu Hongyu ◽  
Kong Hui ◽  
Jiang Dongmei ◽  
Shi Wangzhou ◽  
Ma Xueming
Keyword(s):  
Electrical Properties ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Doped Zno

scholarly journals Structural and Electrical Properties of Zn1-xCrxO NTCR Nanoceramics Synthesized by High Energy Ball Milling

2021 ◽  
Author(s):  
Bikram Keshari Das ◽  
Tanushree Das ◽  
Kajal Parashar ◽  
S.K.S Parashar ◽  
Rajeev Kumar ◽  
...  
Keyword(s):  
Particle Size ◽  
Electrical Properties ◽  
Ball Milling ◽  
Structural Parameters ◽  
High Energy ◽  
High Energy Ball Milling ◽  
High Frequency Region ◽  
Structural And Electrical Properties ◽  
Energy Ball ◽  
Doped Zno

Abstract Cr doped ZnO (x = 0-0.04) nanoceramics was successfully synthesized by high energy ball milling (HEBM) technique. The structural and electrical properties of the synthesized sample has been studied in detail. The doping of Cr into ZnO has been verified by X-ray diffraction (XRD) and also from the variation in structural parameters. Rietveld refinement XRD pattern of calcined sample showed the hexagonal wurtzite structure and it did not induce impurity phases. From the XRD, it has been confirm that maximum result confirms that up to 4 atomic% of Cr can be doped into ZnO. The strain of the sample reduced with increase in particle size. After sintering, there is a growth of particle size of Cr doped ZnO sample. The impedance spectroscopy data shows a single semicircle in the high frequency region corresponding to the bulk properties of the nanoceramic sample. The decrease in real part of the impedance with temperature suggests the NTCR behavior of the sample in the temperature range of 300-500 ºC. The temperature dependent relaxation phenomena are also observed for the synthesized ceramic sample at high temperature. Distributed relaxation time suggests that the relaxation in the synthesized samples is of non-Debye type. The equivalent electrical circuit of the semicircular pattern in the impedance spectrum of ZnO and Zn1-xCrxO nanoceramics sample is a parallel combination of bulk resistance (Rb) and bulk capacitance (Cb).

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