Article
Materials Science, Ceramics
Alireza Ramezani, Hossein Abdizadeh, Mohammad Reza Golobostanfard
Summary: BaTiO3 and SrTiO3 thin films and BaTiO3/SrTiO3 lamellar composites were successfully synthesized using the sol-gel spin-coating method in this study. The morphology and band gap of the composite samples could be altered by changing the periodicity of the samples. The optical properties of the multi-stacked composites, including dielectric constant, dielectric loss, impedance, Urbach tail, extinction coefficient, and electric modulus, were also investigated.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Jie Wu, Gaochao Zhao, Chengbing Pan, Kun Tao, Jie Yang, Xuebin Zhu, Peng Tong, Lihua Yin, Wenhai Song, Yuping Sun
Summary: We investigated the effect of A-site disorder on the properties of lead-free Ba1-x-ySrxCayTiO3 perovskites and found that decreasing A-site disorder leads to reduced tetragonal distortion, ferroelectric transition temperature, and the temperature of the maximum electrocaloric effect. By optimizing the A-site disorder, the highest adiabatic temperature change can be achieved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
X. Chen, J. Yvonnet, H. S. Park, S. Yao
Summary: By numerical simulations and topology optimization, it is demonstrated that piezoelectric composites have the potential for significantly large apparent converse flexoelectric properties. Both converse and higher order electromechanical coupling effects contribute strongly to the flexoelectric response and properties of these composites.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Soroush Dashtizad, Parvin Alizadeh, Amin Yourdkhani
Summary: The study demonstrates that an increase in the BaTiO3 content leads to higher piezoelectric output voltage in PVDF-BaTiO3-Ag composite fibers, primarily attributed to an increase in the beta phase content and the presence of silver as a conductive phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Polymer Science
Umesh Kumar, Diwakar Padalia, Prabhakar Bhandari, Pawan Kumar, Lalit Ranakoti, Tej Singh, Laszlo Lendvai
Summary: Europium-doped barium titanate particles were used as filler material and polystyrene was used as a matrix to fabricate Ba1-3x/2Eu(x)TiO(3)/PS polymer nanocomposites. The XRD and FTIR data confirmed the incorporation of filler particles in the polymer matrix, and the FE-SEM data showed that the particles were in the nanophase. The optical band gap was directly affected by the filler particles.
Article
Engineering, Electrical & Electronic
Jianquan Qi, Tianchi Yu, Mengying Li, Jiahui Xie, Cunle Bo, Hang Zhu, He Liu, Hengchang Wang, Yuxi Xie, Yilin Liu, Xiumei Han
Summary: The study synthesized powders of Ba0.75Sr0.25TiO3 (BST) nanoparticles directly through milling, achieving dense ceramics with a density of >90% by adding Bi2O3 and Li2CO3 sintering aids. Bi-related intermediate compounds acted as perovskite-structured templates to enhance mass transfer and promote sintering densification in ceramics at different temperatures.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
S. A. Gridnev, I. I. Popov, M. A. Kashirin, A. Bocharov
Summary: By investigating the temperature dependences of internal friction and Young's modulus in ferroelectric ceramics, the effects of different external conditions on the material's performance were observed. The addition of 0.2 mass. % La led to an increase in internal friction and a decrease in the internal friction maximum near the phase transition temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Polymer Science
Ekaterina I. Lashkovskaya, Nikolai V. Gaponenko, Margarita V. Stepikhova, Artem N. Yablonskiy, Boris A. Andreev, Vadim D. Zhivulko, Alexander V. Mudryi, Igor L. Martynov, Alexander A. Chistyakov, Nikolai I. Kargin, Vladimir A. Labunov, Tamara F. Raichenok, Sergey A. Tikhomirov, Victor Yu. Timoshenko
Summary: Erbium upconversion photoluminescence from sol-gel derived barium titanate xerogel structures on different substrates was studied. The intensity of erbium UC PL can be increased by adding a layer of strontium titanate or codoping with erbium and ytterbium. Tuning of the cavity mode was achieved by assembling a multilayer microcavity structure.
Article
Materials Science, Ceramics
JingJing Yang, ZhaoChen Wang, Hao Feng, YanHui Wei, GuoChang Li, YongCan Zhu, ChunCheng Hao, QingQuan Lei, ShengTao Li
Summary: Silicone rubber is widely used in electric power equipment due to its excellent insulation performance and weather resistance. However, its weak breakdown characteristic limits its application in high-voltage grade power equipment. This paper constructs a nano-modification system of silicone rubber using a binary composite matrix of phenyl-vinyl. The introduction of the benzene ring structure improves the breakdown strength of the matrix, while the use of barium strontium titanate (BST) improves the permittivity of the composite, reducing the electric field shared by silicone rubber.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
A. Y. Mironovich, V. G. Kostishin, R. I. Shakirzyanov, A. A. Mukabenov, S. A. Melnikov, A. I. Ril, H. I. Al-Khafaji
Summary: BaFe12O19 and SrFe12O19 ferrite powders were synthesized by hydrothermal method and characterized by various techniques. The presence of secondary phases was found to significantly affect the magnetization and coercivity, with powders containing a high content of hexaferrite exhibiting excellent coercive force and potential for permanent magnet applications.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Xichang Liu, Ying Yuan, Lei Cao, Enzhu Li, Shuren Zhang
Summary: By introducing relaxation and reducing grain size, novel composite ceramics BST-xBLZS were prepared to improve the dielectric breakdown strength and energy storage density of Ba0.4Sr0.6TiO3. The enhanced relaxation effect and reduced grain size resulted in near-zero remnant polarization and significantly improved efficiency. The composite ceramics exhibited excellent temperature and frequency stability, large power density, and fast discharge rate, making them highly promising for practical pulse power applications.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Jonas Wawra, Kornelius Nielsch, Ruben Huehne
Summary: Substrate-induced strains can significantly affect the structural and functional properties of epitaxial thin films. By growing epitaxial Ba0.7Sr0.3TiO3 films on REScO3 substrates with smaller lattice mismatch, the quality of the films was improved compared to SrTiO3. The strain state of the functional layer depended on the substrate and thickness, leading to differences in permittivity and polarization behavior at different temperatures.
Article
Engineering, Biomedical
Subhasmita Swain, Chris Bowen, Tapash Rautray
Summary: Strontium substitution was achieved in hydroxyapatite and barium titanate composites to mimic the electrical properties of natural bone. The 10SrHA-10BST composite showed superior osteoblast activity and polarized composites exhibited promising antibacterial effects against Staphylococcus aureus.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
(2021)
Article
Chemistry, Physical
Marin Cernea, Mihail Secu, Roxana Radu, Paul Ganea, Vasile Adrian Surdu, Roxana Trusca, Eugenia Tanasa Vasile, Elisabeta Corina Secu
Summary: The study synthesized polycrystalline Ba1-xTbxTiO3 materials and analyzed their photoluminescence and dielectric properties, revealing that increasing terbium content reduces Curie temperature and increases phase transition diffuseness. UV-vis reflectance spectra showed a decrease in band gap energy with higher Tb content, while photoluminescence spectra demonstrated terbium enhances photoluminescence accompanied by self-trapped exciton emission.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Roxana-Elena Patru, Catalina Andreea Stanciu, Elena Mirabela Soare, Vasile-Adrian Surdu, Roxana Doina Trusca, Adrian Ionut Nicoara, Bogdan Stefan Vasile, Georgia Boni, Luminita Amarande, Nadejda Horchidan, Lavinia Petronela Curecheriu, Liliana Mitoseriu, Lucian Pintilie, Ioana Pintilie, Adelina-Carmen Ianculescu
Summary: Dense fine-grained Ba0.6Sr0.4TiO3 ceramics were prepared by sol-gel synthesized nanopowders and Spark Plasma Sintering consolidation. The grain size was reduced from 214 nm to 74 nm by changing the SPS parameters. Impedance Spectroscopy revealed diffuse ferroelectric-paraelectric phase transitions and low dielectric permittivity values (<1000) at the Curie temperature (T-C around 280 K) in all sintered ceramics. The reduction in grain size led to a gradual decrease in dielectric constant, tunability, polarization, and storage energy properties. Raman spectroscopy identified the presence of polar nanoclusters above T-C. The observed properties of Ba0.6Sr0.4TiO3 nanostructured ceramics were attributed to the interplay between grain size reduction, the role of low-permittivity grain boundaries, and the diffuse nature of the ferroelectric-to-paraelectric transformation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
S. F. Mansour, O. M. Hemeda, M. A. Abdo, W. A. Nada
JOURNAL OF MOLECULAR STRUCTURE
(2018)
Article
Physics, Applied
O. M. Hemeda, A. Tawfik, A. M. A. Henaish, B. I. Salem
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2018)
Article
Chemistry, Physical
Mohamed Gaber, Nadia El-Wakiel, Osama M. Hemeda
JOURNAL OF MOLECULAR STRUCTURE
(2019)
Article
Materials Science, Multidisciplinary
Osama M. Hemeda, A. Tawfik, A. M. Dorgham, Mahmoud A. Hamad
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Physics, Multidisciplinary
Adly H. El-Sayed, O. M. Hemeda, Mahmoud A. Hamad, Ashraf M. Mohamed
EUROPEAN PHYSICAL JOURNAL PLUS
(2019)
Article
Physics, Applied
Adly H. El-Sayed, O. M. Hemeda, Mahmoud A. Hamad, Ashraf M. Mohamed
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2020)
Article
Materials Science, Multidisciplinary
O. M. Hemeda, A. M. A. Henaish, S. F. Mansour, T. Sharshar, Mahmoud A. Hamad
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2020)
Article
Materials Science, Multidisciplinary
O. M. Hemeda, A. M. A. Henaish, B. I. Salem, F. S. El-Sbakhy, Mahmoud A. Hamad
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2020)
Article
Physics, Condensed Matter
O. M. Hemeda, B. Salem, H. Abdelfatah, G. Abdelsatar, M. Shihab
PHYSICA B-CONDENSED MATTER
(2019)
Article
Materials Science, Multidisciplinary
Badawi Anis, Hesham El Fllah, Tawfik Ismail, Wael M. Fathallah, A. S. G. Khalil, O. M. Hemeda, Yehia A. Badr
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
Article
Physics, Applied
Mahmoud A. Hamad, O. M. Hemeda, Ashraf M. Mohamed
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2020)
Article
Physics, Applied
Mahmoud A. Hamad, O. M. Hemeda, Ashraf M. Mohamed
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2020)
Article
Crystallography
A. M. A. Henaish, M. Mostafa, B. I. Salem, O. M. Hemeda
Article
Nanoscience & Nanotechnology
K. H. Omran, M. S. Abd El-sadek, M. Mostafa, O. M. Hemeda
APPLIED NANOSCIENCE
(2020)