Diffusion and Ionic Conduction in Nanocrystalline Ceramics

2001 ◽  
Vol 676 ◽  
Author(s):  
Paul Heitjans ◽  
Sylvio Indris
Keyword(s):  
Impedance Spectroscopy ◽  
Ball Milling ◽  
Ionic Conduction ◽  
Nmr Relaxation ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Nanocrystalline Ceramics ◽  
Energy Ball ◽  
Li Ion ◽  
Mobile Ions

ABSTRACTDiffusion and ionic conduction in nanocrystalline ceramics, both monophase and composite, was studied by NMR relaxation and NMR lineshape as well as impedance spectroscopy. Measurements were mainly done on Li ion conductors prepared by high-energy ball milling. It was possible to discriminate between mobile ions in the interfacial regions and immobile ions in the grains. In general the diffusivity and conductivity are enhanced in the nanocrystalline monophase system as compared to the microcrystalline one, e. g. by about four orders of magnitude in the case of CaF2. An exception is, e. g., Li2O where the nano- and microcrystalline forms have similar conductivities. However, when the nanocrystalline insulator B2O3 is added to nanocrystalline Li2O the conductivity of the composite increases whereas it decreases in the corresponding microcrystalline system.

SnSb/TiO2/C nanocomposite fabricated by high energy ball milling for high-performance lithium-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32462-32466 ◽  
Author(s):  
Haihua Zhao ◽  
Wen Qi ◽  
Xuan Li ◽  
Hong Zeng ◽  
Ying Wu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Ball Milling ◽  
High Performance ◽  
High Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Li Ion Batteries ◽  
Energy Ball ◽  
Li Ion

Alloy anodes for Li-ion batteries (LIBs) have attracted great interest due to their high capacity.

Effect of High-Energy Ball Milling on the Charge-Discharge Behaviour of LiCo0.3Ni0.7O2

2014 ◽  
Vol 895 ◽  
pp. 400-403 ◽  
Author(s):  
Kelimah Elong ◽  
Norlida Kamarulzaman
Keyword(s):  
Ball Milling ◽  
Volume Ratio ◽  
Combustion Method ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Voltage Range ◽  
Lithium Secondary Batteries ◽  
Energy Ball ◽  
Li Ion ◽  
Charge Discharge

Li-ion cathode materials in the nanodimension should show improvement in capacity retention from the normal material. This is because the electrochemical performance of the cathode material in lithium secondary batteries depends on the electrochemical redox reaction which is affected by the surface area to volume ratio of the particles. In this work, LiCo0.3Ni0.7O2 powder will be prepared via a self-propagating combustion method and the high-energy ball milling method will be used to prepare LiCo0.3Ni0.7O2 nanopowders. X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) are used to characterize the materials. The materials are observed to be phase pure. Li-ion cells are then fabricated and tested. The cells are subjected to a series of charge-discharge cycling in the voltage range of 3.0 to 4.3 V. It was found that the nanomaterial exhibit specific capacities less than that of the normal material.

scholarly journals Impact Evaluation of High Energy Ball Milling Homogenization Process in the Phase Distribution of Hydroxyapatite-Barium Titanate Plasma Spray Biocoating

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 728
Author(s):  
Roberto Gómez Batres ◽  
Zelma S. Guzmán Escobedo ◽  
Karime Carrera Gutiérrez ◽  
Irene Leal Berumen ◽  
Abel Hurtado Macias ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Ball Milling ◽  
Plasma Spray ◽  
Bonding Strength ◽  
Phase Distribution ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray ◽  
Nanomechanical Properties ◽  
Energy Ball

Air plasma spray technique (APS) is widely used in the biomedical industry for the development of HA-based biocoatings. The present study focuses on the influence of powder homogenization treatment by high-energy ball milling (HEBM) in developing a novel hydroxyapatite-barium titanate (HA/BT) composite coating deposited by APS; in order to compare the impact of the milling process, powders were homogenized by mechanical stirring homogenization (MSH) too. For the two-homogenization process, three weight percent ratios were studied; 10%, 30%, and 50% w/w of BT in the HA matrix. The phase and crystallite size were analyzed by X-ray diffraction patterns (XRD); the BT-phase distribution in the coating was analyzed by backscattered electron image (BSE) with a scanning electron microscope (SEM); the energy-dispersive X-ray spectroscopy (EDS) analysis was used to determinate the Ca/P molar ratio of the coatings, the degree of adhesion (bonding strength) of coatings was determinate by pull-out test according to ASTM C633, and finally the nanomechanical properties was determinate by nanoindentation. In the results, the HEBM powder processing shows better efficiency in phase distribution, being the 30% (w/w) of BT in HA matrix that promotes the best bonding strength performance and failure type conduct (cohesive-type), on the other hand HEBM powder treatment promotes a slightly greater crystal phase stability and crystal shrank conduct against MSH; the HEBM promotes a better behavior in the nanomechanical properties of (i) adhesive strength, (ii) cohesive/adhesive failure-type, (iii) stiffness, (iv) elastic modulus, and (v) hardness properties.

scholarly journals Effect of the route and sintering time in the microstructure of pure aluminum prepared by high energy ball milling

2021 ◽  
Vol 27 (S1) ◽  
pp. 3294-3296
Author(s):  
José Mendoza ◽  
C. Carreño-Gallardo ◽  
I. Estrada-Guel ◽  
C.G. Garay-Reyes ◽  
M.A. Ruiz-Esparza-Rodriguez ◽  
...  
Keyword(s):  
Ball Milling ◽  
Pure Aluminum ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Sintering Time ◽  
Energy Ball
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