Article
Chemistry, Physical
Jyoti Rani, Varun K. Kushwaha, Piyush K. Patel, C. Tomy
Summary: The lead-free (BZT-0.5BCT)/CFO/(BZT-0.5BCT) trilayer thin film with strong ME coupling at room temperature exhibited excellent dielectric and magnetoelectric properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Suk-Young Jung, Gwangseop Lee, Tae-wan Kim, Sung-Jin Kim, Jung-Hyuk Koh
Summary: In this study, the characteristics of the lead-free piezoelectric ceramic 0.5BZT-0.5BCT were investigated for its potential use in piezoelectric transformers. The addition of a suitable dopant resulted in a piezoelectric transformer with improved output characteristics. Simulation and experimental results were compared and analyzed to validate the step-up amplification properties of the piezoelectric transformer at the vibrational frequency.
Article
Materials Science, Multidisciplinary
Sasmita Otta, Laxman Kand, Rajat Kumar Das, Viswa Ranjan Mohanta, Binod Kumar Roul, Bibuti Bhusan Dash, Bhagaban Kisan
Summary: The single-phase solid solution of 0.5 {Ba (Zr0.2Ti0.8) O-3}_ 0.5 {(Ba0.7Ca0.3) TiO3} ceramic sample was prepared using solid state method. The X-ray diffraction analysis confirmed the presence of tetragonal and rhombohedral crystal structures. Scanning electron microscopy showed well-defined grains with an average size of 4.2 μm. The sample exhibited a band gap of 2.8 eV and a phase transition from tetragonal to cubic phase.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Shivam Dubey, Akshay Gaur, Awad A. Ibraheem, Rahul Vaish, Anuruddh Kumar, Hyeong Kwang Benno Park, Yun Hwan Joo, Tae Hyun Sung
Summary: This study explores the use of BST-BZT ceramic composition in water cleaning applications through piezocatalysis, photocatalysis, and piezo-photocatalysis processes. The composition was synthesized and characterized by various techniques. The degradation of a representative organic pollutant, Methylene Blue, was observed in these processes, with the highest degradation in the piezo-photocatalysis process. The ceramic composition's photocatalytic activity was also evaluated under solar light irradiation, and its phytotoxicity level was examined.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Moolchand Sharma, Satyanarayan Patel, A. Arockiarajan, Rahul Vaish
Summary: The study conducted creep and fatigue characterization on BZT-BCT bulk ferroelectric ceramics, finding that the material is stable below 75 degrees Celsius and can withstand high cycle fatigue loads, showing promise for potential applications.
FUNCTIONAL MATERIALS LETTERS
(2021)
Article
Chemistry, Physical
Chhavi Mitharwal, Geetanjali, Shilpa Malhotra, Anshika Bagla, Manish Kumar Srivastava, Surya Mohan Gupta, Chandra Mohan Singh Negi, Epsita Kar, Ajit R. Kulkarni, Supratim Mitra
Summary: The dopamine-modified filler incorporated PVDF composite shows potential for flexible energy storage and harvesting applications. The composite exhibits improved filler dispersion and dielectric properties, leading to enhanced energy harvesting and storage capabilities. Different filler contents result in varying energy storage density and energy harvesting performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Vladimir Lucian Ene, Valentin Razvan Lupu, Claudiu Vasile Condor, Roxana Elena Patru, Luminita Mirela Hrib, Luminita Amarande, Adrian Ionut Nicoara, Lucian Pintilie, Adelina-Carmen Ianculescu
Summary: Fine-tuning of grain sizes can greatly affect the interaction between different dielectric phenomena, allowing the development of materials with tailored dielectric responses. Understanding the relationship between grain size and dielectric properties can lead to the design and optimization of materials for specific applications.
Article
Chemistry, Physical
Jose P. B. Silva, Katarzyna Gwozdz, Luis S. Marques, Mario Pereira, Maria J. M. Gomes, Judith L. MacManus-Driscoll, Robert L. Z. Hoye
Summary: Combining the ferroelectric, pyroelectric, and photovoltaic properties in one material is a new way to enhance photodetector performance. By using the triple multifunctionality of 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 (BCZT) in an Al/Si/SiOx/BCZT/ITO thin-film device, a metal-ferroelectric-insulator-semiconductor heterostructure is formed. The device exhibits a photo-response that is independent of the chopper frequency due to the pyro-phototronic effect, which combines the pyroelectric and photovoltaic responses. However, the presence of ferroelectricity significantly improves the photodetector performance by four times compared to solely relying on the pyro-phototronic effect.
Article
Physics, Condensed Matter
Feng-chao Su, Xiao-bin Guo, Xiao-ling Lu, Zheng Su, Wen-hai Qiu, Xin-gui Tang, Shui-feng Li, Wen-hua Li
Summary: 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BCZT) ceramics with average grain sizes ranging from 3.26 to 18.15 μm were synthesized by adjusting the sintering temperature. The effects of grain size on the dielectric, ferroelectric, and impedance properties of BCZT ceramics were investigated, and the presence of liquid phase in the grain boundary was observed. The competition between grain size effect and liquid phase in the grain boundary morphology significantly influenced the maximum dielectric constant and loss tangent. The improved compactness and hindered grain boundary conduction led to an increase in energy storage efficiency and a decrease in energy density. The quantitative analysis of different grain boundary morphologies on the electrical properties of BCZT ceramics was obtained through high-temperature impedance patterns and DC conductivity fluctuations. These findings are important for the design and preparation of targeted functional ceramics with specific microstructures.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Charles McLouth Culbertson, Alicia Manjon-Sanz, Marcos Lucero, Zhenxing Feng, Michelle R. Dolgos
Summary: Neutron total scattering and multi-edge X-ray absorption analyses were performed on a powder sample consisting of 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3. The results showed distorted titanium in a BaTiO3-like chemical and bonding environment, and cubic symmetry for zirconium in ZrO6 octahedra. Combining different phases models were needed to better describe the local structure.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Engineering, Electrical & Electronic
Khadijah Mohammedsaleh Katubi, Shivam Dubey, Akshay Gaur, Rahul Vaish, Norah Salem Alsaiari, Imen Kebaili, Imed Boukhris, Fatimah Mohammed A. Alzahrani, M. S. Al-Buriahi
Summary: A porous BST-BZT ceramic with increased surface area was successfully synthesized using a solid-state reaction route and PMMA porogen. The porous ceramic exhibited enhanced degradation of MB dye due to the increased porosity.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Amir Mahdi Molavi, Parvin Alizadeh
Summary: Multiferroic composite materials with one-dimensional core-shell structure were successfully synthesized by electrospinning for the first time, and the influence of different synthesis routes on the properties of the composite fibers was investigated, with the second method showing higher saturation magnetization and dielectric constant.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Sujata Swain, Rakesh Bhaskar, Balaram Mishra, Mukesh Kumar Gupta, Sonia Sudip Dasgupta, Pawan Kumar
Summary: This study investigated the mechanical, electrical and bio properties of xHAp/(1-x)BZT-BCT composites. It was found that the addition of BZT-BCT improved the mechanical and electrical properties of HAp, leading to increased proliferation of human osteogenic cells.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Applied
Xijie Jiang, Christian Dietz, Na Liu, Virginia Rojas, Robert W. Stark
Summary: The study using piezoresponse force microscopy revealed the evolution of domain structures in BZT-0.5BCT ceramics at micrometer and nanometer scales, showing the coexistence of wedge-shaped and lamellar domains at room temperature, with transitional domain structures appearing in both thermal and poling cycles. Additionally, the electric-field-dependent domain structure evolution demonstrated better reversibility at high temperatures, highlighting the superior stability of BZT-0.5BCT ceramics at medium temperatures for applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Nicholas Cucciniello, Alessandro R. Mazza, Pinku Roy, Sundar Kunwar, Di Zhang, Henry Y. Feng, Katrina Arsky, Aiping Chen, Quanxi Jia
Summary: With the anticipated doubling of energy demand in the next three decades, there is a pressing need to advance the technology of energy harvesting and storage for renewable energy. This study focuses on a specific subset of dielectric materials, ferroelectrics, for energy storage. By exploring the influence of crystallographic orientation on the microstructure and properties, the research offers insights into enhancing energy storage performance.
Article
Engineering, Biomedical
Joana Baltazar, Manuel Fellipe Rodrigues Pais Alves, Manuel A. Martins, Paula M. C. Torres, Claudinei Santos, Susana Olhero
Summary: The study found that with the increase of extrusion nozzle diameter, the flexural strength of 3Y-TZP bioceramics gradually decreased, while the relative density and linear shrinkage showed no significant differences. X-ray diffraction analysis revealed that the samples are mainly composed of 79-81% tetragonal phase and 19-21% cubic phase.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Materials Science, Biomaterials
P. M. C. Torres, N. Ribeiro, C. M. M. Nunes, A. F. M. Rodrigues, A. Sousa, S. M. Olhero
Summary: This study focuses on the production of composite bioceramic scaffolds using robocasting, without the need for sintering. The addition of silk fibroin to a chitosan matrix significantly improves the mechanical performance of the scaffolds. The degradation rate of the scaffolds is influenced by the composition of the polymers used.
BIOMATERIALS ADVANCES
(2022)
Article
Chemistry, Physical
Ricardo Bento, Anuraag Gaddam, Parastu Oskoei, Helena Oliveira, Jose M. F. Ferreira
Summary: This study focuses on the sol-gel synthesis of an alkali-free bioactive glass and its application in robocasting for fabricating porous scaffolds. By adjusting milling procedures and heat treatment temperature, milling efficiency was improved and mesoporous powders' surface area was affected. Rheological tests were conducted on robocasting inks with 35 vol.% solids, and a customizable CAD scaffold geometry script was developed. The printing process was optimized for higher resolution, while the mechanical properties of the scaffolds were evaluated through compressive strength tests. The scaffolds showed good biomineralization activity and biocompatibility with human keratinocytes, indicating their potential for biomedical applications.
Article
Chemistry, Multidisciplinary
Bruna L. Correia, Ana T. P. C. Gomes, Rita Noites, Jose M. F. Ferreira, Ana S. Duarte
Summary: Endodontic treatment aims to preserve teeth by removing infected tissue, disinfecting, and filling/sealing the root canal. The removal of microorganisms is crucial to prevent reinfection and tooth loss. Due to drug resistance, alternative procedures are needed. This study suggests using bioactive glass as an intracanal medication, which has been found to inhibit the growth of oral pathogens and greatly impact the success of endodontic treatments.
Review
Chemistry, Multidisciplinary
Natacha Rosa, Marcelo F. S. F. Moura, Susana Olhero, Ricardo Simoes, Fernao D. Magalhaes, Antonio Torres Marques, Joao P. S. Ferreira, Ana Rita Reis, Mariana Carvalho, Marco Parente
Summary: Bone is a well-designed composite with unique mechanical properties and adaptive abilities, making it an innovative model for synthetic biomimetic composites. This article describes the hierarchical organization of bone and presents the fundamental concepts for understanding its mechanical properties and structural behavior. The importance of better understanding bone's complex structure is emphasized.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
P. Vineetha, Roshan Jose, Ammu Vijay, Charan S. Prasanth, Saravanan K. Venkata
Summary: The microstructure, dielectric properties, relaxor behavior, and energy storage efficiency of un-substituted and niobium (Nb) substituted (Ba-0.85 Ca-0.15)(Zr-0.1 Ti-0.9) (1-x) NbxO3 samples prepared by the solid-state reaction method were studied. The addition of niobium was found to inhibit grain growth and induce structural and phase changes. The Nb substituted samples exhibited relaxor behavior and higher energy storage efficiency, making them promising materials for energy storage applications.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Claudinei Santos, Joana Baltazar, Manuel F. R. P. Alves, Susana M. Olhero
Summary: Partially translucent zirconia for dental applications was developed using robocasting technique. The sintered samples showed high relative density and good mechanical properties. The transparency of the material is influenced by material thickness, relative density, and microstructure.
Article
Biochemistry & Molecular Biology
Helena Salgado, Ana T. P. C. Gomes, Ana S. Duarte, Jose M. F. Ferreira, Carlos Fernandes, Maria Helena Figueiral, Pedro Mesquita
Summary: This study tested the antimicrobial activity and surface roughness of a graphene-enhanced dental resin against Candida albicans and Streptococcus mutans. The increase in graphene concentration resulted in increased surface roughness. Graphene was effective in inhibiting the growth and adhesion of C. albicans and S. mutans.
Article
Green & Sustainable Science & Technology
Nuno P. F. Goncalves, Susana M. Olhero, Joao A. Labrincha, Rui M. Novais
Summary: This study presents a new management strategy for bauxite residue or red mud (RM), a hazardous waste derived from the alumina industry. Porous structures containing RM were prepared for the extraction of methylene blue (MB) from synthetic wastewater. The structures exhibited high compressive strength, high open porosity, large specific surface area, and excellent stability. Batch adsorption tests showed that the RM/MK-based structures had a high MB uptake, ranking them among the best performing geopolymer adsorbents. Furthermore, the structures were successfully regenerated and reused without compromising their performance.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Materials Science, Multidisciplinary
Tania S. S. Carvalho, Nilza Ribeiro, Paula M. C. Torres, Jose C. Almeida, Joao H. Belo, J. P. Araujo, Antonio Ramos, Monica Oliveira, Susana M. Olhero
Summary: This study aims to enhance the magnetic susceptibility of PLA-based biocomposites by incorporating 5 wt% of iron doped biphasic calcium phosphate (FeBCP) powders into the PLA matrix, avoiding the use of magnetic nanoparticles with unclear long-term side effects. The FeBCP composites showed ferromagnetic-like behavior, superior tensile strength, and cytocompatibility compared to PLA or non-doped composites. This proof of concept opens up possibilities for future development of biomedical applications utilizing magnetic PLA-based biocomposites.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Liviu Nedelcu, Jose M. F. Ferreira, Adrian-Claudiu Popa, Luminita Amarande, Bo Nan, Liliana-Marinela Balescu, Cezar Dragos Geambasu, Marius-Cristian Cioangher, Lucia Leonat, Mihai Grigoroscuta, Daniel Cristea, Hermine Stroescu, Robert Catalin Ciocoiu, George E. Stan
Summary: This study conducted a comparative analysis of various sintered piezoceramic materials using multi-parametric unitary methods. The aim was to identify the most promising biocompatible piezoelectric material for use in 3D printed macro-porous ceramic scaffolds. The results showed that the BCTZ solid solution had the best combination of functional properties and compatibility with osteoblast cell cultures. Using the selected piezoceramic as a base material, 3D macro-porous scaffolds with promising compressive strength and excellent cell colonization capability were fabricated.
Article
Materials Science, Ceramics
M. S. Faria, M. F. R. P. Alves, R. Cintra, F. J. Oliveira, C. M. Fernandes, D. Figueiredo, S. M. Olhero
Summary: The conventional methods face challenges in fabricating complex shaped Si3N4 parts due to their high hardness and mechanical strength. Additive manufacturing (AM) has emerged as a competitive and cost-effective approach to achieve three-dimensional complexity. However, limitations in producing high dense ceramics still exist in most AM technologies, mainly attributed to difficulties in developing suitable feedstock. This study demonstrates the fabrication of dense silicon nitride-based ceramics using an extrusion based additive manufacturing technique (direct ink writing, or robocasting) and cold isostatic pressing (CIP) as a post processing step. The use of CIP helps in reducing or eliminating defects and porosity, leading to improved mechanical performance of the final parts. The relative density, microhardness, and flexural strength of the parts increase with higher solids loading in the inks and are further enhanced by CIP pressing. Parts produced by robocasting with 39 vol% ink and cold isostatic pressed at 200 MPa exhibit comparable properties to conventionally processed silicon nitride ceramics, with an average relative density of around 99%, a microhardness value of 1475 HV2, and a flexural strength of 650 MPa.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Natacha Rosa, Maria Vila Pouca, P. M. C. Torres, Susana M. Olhero, Renato Natal Jorge, Marco Parente
Summary: This paper presents a methodology to predict the potential behavior of bioceramic-based composite scaffolds for bone engineering applications. The results show that scaffolds with a regular structure and 500μm filament distance or irregular architecture demonstrate better performance in cell adhesion and migration, nutrient and oxygen flow, vascularization, mechanical capacity, and initial bone formation.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Biomedical
Cristina Besleaga, Bo Nan, Adrian-Claudiu Popa, Liliana Marinela Balescu, Liviu Nedelcu, Ana Sofia Neto, Iuliana Pasuk, Lucia Leonat, Gianina Popescu-Pelin, Jose M. F. Ferreira, George E. Stan
Summary: Bi-phasic calcium phosphates (BCPs) are promising materials for bone graft substitutes. This study investigates the structural role of supplemental cation-doping in BCPs and its influence on biological effects. The results show that double Mg-Sr doping in BCPs leads to the highest β-TCP/hydroxyapatite mass concentration ratio.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2022)
Article
Materials Science, Ceramics
Joana Baltazar, Manuel Fellipe Rodrigues Pais Alves, Claudinei dos Santos, Susana Olhero
Summary: The main goal of this work was to obtain dense Al2O3-Y3Al5O12 ceramic composites using direct ink writing of three-dimensional samples. The printed samples were sintered at different temperatures and characterized for density, phase composition, microstructure, and hardness. The study successfully achieved dense ceramic composites with desired properties for potential applications.
CERAMICS-SWITZERLAND
(2022)
