Ferroelectrics and multiferroic ceramics and nanolayers
Synthesis of ferroelectrics/multiferroic ceramics and nanolayers for microwave and sensors applications
Tech Area / Field
- BIO-SFS/Biosafety and BioSecurity/Biotechnology
- INF-ELE/Microelectronics and Optoelectronics/Information and Communications
- INF-SIG/Sensors and Signal Processing/Information and Communications
- MAT-SYN/Materials Synthesis and Processing/Materials
3 Approved without Funding
National Polytechnical University of Armenia, Armenia, Yerevan
- University of Texas at Brownsville, Department of Physics and Astronomy, USA, TX, Brownsville\nSouth Dakota School of Mines and Technology, USA, SD, Rapid City\nKorea Institute of Science and Technology, Korea, Seoul\nChalmers University of Technology / Department of Microtechnology and Nanoscience, Sweden, Göteborg\nUniversity of Montreal, Canada, QC, Montreal\nFH Aachen/University of Applied Sciences/Institute of Nano- and Biotechnologies (INB), Germany, Jülich
Project summaryThe Project aim. The main objective of this project is to develop a self-propagating high-temperature synthesis (SHS) technology for fabrication of multiferroic and ferroelectric (i.e., Bi1-xYxMnO3, (1-x)BiFeO3-xBaTiO3, CuO-Ba1-xSrxTiO3, LuFe2O4, PbZr1-xTixO3, CuO-Ba1-xSrxTiO3, BiFe1-xMnxO3 and BaZr1-xYxO3) perovskite powders and ceramic targets. First, we plan to study the thermodynamic feasibility of the combustion synthesis and an experimental analysis of the combustion zone structure, the sequence of the chemical phase and structural transformations. The second approach is development of processes of fabrication of the nano-structured ferroelectric/multiferroic films on different substrates and buffer layers as well as field-effect based devices using pulsed laser deposition (PLD) and conventional silicon microtechnology. Third, an exploration of new magnetic, dielectric and acoustic phenomena of these multiferroics/ferroelectrics for possible applications in chemical, biomedical sensors and devices for communication systems is envisaged.
Current status. Multiferroics/ferroelectrics, as multifunctional materials, are extensively considered for applications in tunable microwave components, high-speed non-volatile memory devices, pyroelectric and piezoelectric devices, chemical and biosensors. The above mentioned composites have attracted tremendous interests due to their high dielectric constant, large spontaneous polarization, low losses and good piezoelectric properties. In addition, the integration of multiferroics as chemically and biologically active material together with metal-insulator-semiconductor capacitor and ferroelectric-gate field-effect transistors is one of the most attractive approaches of chemical sensors and biosensors.
Sensors with CuO-Ba1-xSrxTiO3 sensing films are attractive for measuring the CO2 concentration in the atmosphere, BaZr1-xYxO3 films are attractive for the detection of relative humidity. Field-effect sensors with BiFe1-xMnxO3 are appropriate for continuous controlling the composition of hazardous gases, e.g., for threat detection and identification within enclosed spaces.
The project’ influence on progress in this area. The ferroelectric-insulator-semiconductor structures have a rich variety of physical properties that are used and/or considered for application in sensor technology, and information sector as well (i.e., memory cells, piezotransducers, agile microwave and acoustic components). The syntheses of peroxide compositions based on traditional methods are costly and often not environmentally friendly. The main advantages of the proposed SHS technology are very low energy consumption, since the combustion provides all the energy needed to carry out the reaction, and high quality products. This new technology drastically increases the productivity, decreases the processing time and working areas, finally resulting in large total savings. The SHS technology is easy to perform; for it only simple production facilities are required. Thus, the SHS technology can be easily automated and implemented industrially in Armenia (in other countries as well) and might have substantial impact on the industry of Armenia.
The success of the project fulfillment will have a positive and helpful impact on fields of other ceramic materials applications, especially in automotive, machine tool, health care, and micro-mechanic ones. The fundamental knowledge generated will be useful in the future SHS development of other functional oxide materials (such as SOFC, piezoelectric, toners, superconductor, etc.). The project will allow the participation of students that will improve the research infrastructure in the State Engineering University of Armenia (SEUA).
Participants’ expertise. The Department of Microelectronics and Biomedical Devices at SEUA is equipped with the basic facilities for SHS studies and fabrication targets for thin-film deposition. The research team has many years of experience in developing the SHS process and batch syntheses of different compounds (La1-xSrxMnO3, LaCr1-xMgxO3, LaxSr1-xCrO3 Mg0.5-xMnxZn0.5Fe2O4, MnxZn1-xFe2O4, Ni1-xMnxFe2O4, Ni0.46Zn0.42Cu0.12Fe2O4 , SiC/Ge, SiC/Si, PZT, BaTiO3, SrTiO3 as well as theoretical and experimental investigations of semiconductor and ferroelectric ceramics and thin films based active and passive components.
The available experimental facilities will be used for the successful completion of the proposed project. Apart from senior researchers, master degree and post-graduate students will be involved in the project.
Meeting the ISTC goals and objectives. The project will allow reorientation of high-qualified scientific staff, engineers and technical workers, being previously engaged in the sphere of armament, provision of them with an alternative job for solving peace problems.
The fundamental knowledge generated will be useful for future SHS development of other functional oxide materials (like solid oxide fuel cells components, toners, superconductor, etc.). The research results will be included into lecture materials for the students at the Department of Microelectronics and Biomedical Devices (SEUA), Radiophysics (Yerevan State University), Technical Physics (Russian-Armenian University) as well as reported at international conferences and disseminated through technical papers in scientific journals. Young scientists under 35 years and students will participate in the proposed project.
Scope of activities. The actual tasks include:
1. To study and establish the combustion law for the multi-component systems, to solve the problems associated with the control of combustion temperature, speed of propagation front and to control the conversion degree;
2. Investigation of the physical-chemical conversion mechanisms and the influence of technological processes on the electrical and conversional properties of the synthesized oxide structures;
3. Development of the theoretical model for description of the conversion steps in the systems studied;
4. Study of the optimal condition for treatment of the combustion products into sintered ceramic articles (targets ) and investigations of their electro-physical and conventional-sensorial properties; these investigations will include the determination of optimal grinding regimes, sintering or growth conditions;
5. It is planned to fabricate:
perovskite-oxide thin-films of different thickness and composition using pulsed laser deposition;
field-effect capacitive sensors with ferroelectric-insulator-semiconductor structures of different thickness and composition using conventional silicon microtechnology;
FBARs for microwave and liquid sensor applications
6. Investigation of physical, electrochemical, electrical and dielectric characterization of the complex metal-oxide thin films and impedance-spectroscopy measurements; determination of hysteresis, stability and response time of the samples;
7. Evaluation of the obtained results and modeling the equivalent circuit of the EFIS structure; development of some recommendations for the optimization of material composition and technological conditions in terms of high sensor performance characteristics.
Role of foreign collaborators / partners. Six foreign collaborators with complementing expertise are involved in the project.
The research interests of the group of Microtechnology and Nanoscience (Chalmers University of Technology, Sweden), led by Prof. Dr. Spartak S. Gevorgian, are: physics, design and experimental investigation of microwave devices and components. The main activities are aimed to applications of new materials (ferroelectrics, superconductors, semiconductors) and physical phenomena in components for advanced microwave/mobile communications systems. The list of components developed in recent years includes tunable and switchable FBARs, ferroelectrics varactors, tunable filters, delay lines, phase shifters, silicon monolithic microwave integrated circuits and photonic devices.
The group in Germany at the Institute of Nano- and Biotechnologies (INB) at Aachen University of Applied Sciences (Prof. Dr. Michael J. Schöning, Prof. Dr. Arshak Poghossian) and the Research Centre Jülich conducts both basic- and application-oriented research in the fields of sensor and thin-film technology, micro- and (nano-)biotechnology. In the frame of the planned project all necessary equipment for the fabrication and physical/electrochemical characterization of the sensor chips are available. Some selected examples include: Clean-room facilities, AFM, TEM, SEM, ellipsometer, 3-D-video microscope, impedance analyzer, HP semiconductor parameter analyzer, home-made equipments for EIS, ISFET and LAPS characterization, different electrochemical equipments, etc.
The Korea Institute of Science and Technology (KIST) interested (particularly) to manufacturing for the commercialization of CuO-Ba1-xSrxTiO3, BiFe1-xMnxO3 and BaZr1-xYxO ceramics as a high quality CO2 and Humidity sensors and also assist of the commercialization of the obtained results.
The USA research group at the University of Texas at Brownsville lead by Prof. Karen Martirosyan is conducting cutting edge research focusing on the design and fabrication of a novel advanced multifunctional nano-tailored materials and devices for energy, environmental and biomedical applications. The efforts are directed towards understanding of kinetics and mechanism of structure formation and prediction of their functional physical-chemical properties. As a collaborator USA group will help to guide the development of novel ferroelectric and multiferroic materials and provide research tools to conduct thermodynamic analyses and determine properties of synthesized materials.
The partners are ready to participate in measurements of different properties and parameters of fabricated samples, as well as in the investigations of its structural, functional, and new chemical (biological) sensorial properties.
At the end of each year’s work the project presupposes organization of joint seminars - meetings of the executors, partner and collaborators for the discussion of most important fundamental results and applied researches. With the partner joint publications and patents will be made out. They may also assist the commercialization of the obtained results and their advance to the market.
Technical approach and methodology. There are several methods suitable for the fabrication of the ferroelectric and multiferroic thin films: sol-gel, metal organic deposition (MOD), chemical vapour deposition (CVD), and sputtering by rf magnetron. In this project laser ablation and rf sputtering will be used for deposition of the films; for this, they require high density ceramic targets including adequate dopants. However, the technological development of ceramic targets has been progressing slowly, and existing prolonged furnace or wet-chemical methods for producing these materials require high-energy consumption and are quite expensive. Therefore, the development of the suggested new method of producing ferroelectric targets by means of SHS is important. This might significantly decrease the costs of ferroelectric components (thereby, the cost of microwave devices, chemical sensors, biosensors, too) and accelerate their commercial use.
Our previous thermodynamic predictions and experiments show that CuO-Ba1-xSrxTiO3, BiFe1-xMnxO3 and BaZr1-xYxO3 ceramics can be prepared via the SHS method. The SHS technique is a relatively novel and simple route for the synthesis of a variety of advanced materials. The main advantages of it are the high efficiency, simplicity, safety, ecological cleanliness, low energy consumption, low cost, possibilities to raise the chemical cleanliness of fabricated materials and much lower production of pollutants.
The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.
ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.