Next Article in Journal
The Effect of Zn and Zn–WO3 Composites Nano-Coatings Deposition on Hardness and Corrosion Resistance in Steel Substrate
Next Article in Special Issue
Effect of Chemical Composition on Magnetic and Electrical Properties of Ferroelectromagnetic Ceramic Composites
Previous Article in Journal
Tensile Deformation and Fracture Behavior of Nickel-Based Superalloy DZ951G
Previous Article in Special Issue
Dielectric and Electrical Properties of BLT Ceramics Modified by Fe Ions
 
 
Article

Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics

1
Institute of Materials Engineering, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
2
Institute of Materials Science and Engineering, Poznan University of Technology, Jana Pawła II 24, 61-138 Poznan, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Eugene Olevsky
Materials 2021, 14(9), 2254; https://doi.org/10.3390/ma14092254
Received: 2 April 2021 / Revised: 16 April 2021 / Accepted: 23 April 2021 / Published: 27 April 2021
(This article belongs to the Special Issue The Electrophysical Properties of Ceramic Materials)
This paper investigates the impact of the technological process (Mechanochemical Activation (MA) of the powder in combination with the Spark Plasma Sintering (SPS) method) on the final properties of lead-free Ba(Fe1/2Nb1/2)O3 (BFN) ceramic materials. The BFN powders were obtained for different MA duration times (x from 10 to 100 h). The mechanically activated BFN powders were used in the technological process of the BFN ceramics by the SPS method. The measurements of the BFNxMA ceramic samples included the following analysis: Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS), DC electrical conductivity, and dielectric properties. X-ray diffractions (XRD) tests showed the appearance of the perovskite phase of BFN powders after 10 h of milling time. The longer milling time (up 20 h) causes the amount of the perovskite phase to gradually increase, and the diffraction peaks are more clearly visible. Short high energy milling times favor a large heterogeneity of the grain shape and size. Increasing the MA milling time to 40 h significantly improves the microstructure of BFN ceramics sintered in the SPS technology. The microstructure becomes fine-grained with clearly visible grain boundaries and higher grain size uniformity. Temperature measurements of the BFN ceramics show a number of interesting dielectric properties, i.e., high values of electric permittivity, relaxation properties with a diffusion phase transition, as well as negative values of dielectric properties occurring at high temperatures. The high electric permittivity values predestines the BFNxMA materials for energy storage applications e.g., high energy density batteries, while the negative values of dielectric properties can be used for shield elements against the electromagnetic radiation. View Full-Text
Keywords: lead-free ceramics; mechanochemical activation; spark plasma sintering; negative dielectric constant; negative dielectric loss lead-free ceramics; mechanochemical activation; spark plasma sintering; negative dielectric constant; negative dielectric loss
Show Figures

Figure 1

MDPI and ACS Style

Bochenek, D.; Bartkowska, J.A.; Kozielski, L.; Szafraniak-Wiza, I. Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics. Materials 2021, 14, 2254. https://doi.org/10.3390/ma14092254

AMA Style

Bochenek D, Bartkowska JA, Kozielski L, Szafraniak-Wiza I. Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics. Materials. 2021; 14(9):2254. https://doi.org/10.3390/ma14092254

Chicago/Turabian Style

Bochenek, Dariusz, Joanna A. Bartkowska, Lucjan Kozielski, and Izabela Szafraniak-Wiza. 2021. "Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics" Materials 14, no. 9: 2254. https://doi.org/10.3390/ma14092254

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop