BrainMap

Mrs. Mirela Airimioaei

Dr

Assistant Professor - UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI

Teaching staff

Curriculum Vitae (11/11/2022)

Expertise & keywords

A new material design paradigm in electroceramics: charged defects engineering Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente
PN-III-P1-1.1-TE-2019-1929 2020 - 2022

Role in this project:

Coordinating institution: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI

Project partners: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI (RO)

Affiliation: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI (RO)

Project website: https://stoner.phys.uaic.ro/projects/national-projects/electrochargeng-pniii-te.html

Abstract:

Since single-phase ferroelectric materials cannot accomplish all the technological requirements in applications, developing composite materials that combine the properties of the ferroelectrics with other constituent phases (linear dielectrics, magnetic materials or other conductive/ semiconductor components) is a commonly proposed solution. Recently, it has been shown that a major factor that influences the effective properties of composite materials is the local electric field inhomogeneity introduced by the interfaces between the phases with different permittivities. Based on this effect, we proposed, through a complex modeling / experimental approach, the concept of local field engineering, which involves the design of materials with controlled microstructures and, implicitly, an optimum inhomogeneity of the electric field in order to improve the functional properties. Another important factor that influences the functional properties of composites is the accumulation of free charges at interfaces, but this has been neglected so far in the local field engineering approaches proposed in literature because it involves important computational difficulties. In this project we propose to explore the influence of free electric charges on the effective dielectric properties of real composite systems (which exhibit dielectric losses) through a complex modeling/simulation and experimental validation approach for different types of composites (ferroelectric-semiconductor, magnetoelectric, porous ferroelectrics, etc.). After elucidating the mechanisms in which the free charges influence the functional properties of the composite systems, we propose to design and develop a dielectric-semiconductor composite material for energy storage applications. Within this project, the concept of charged defects engineering will be proposed as a generalization of the high impact idea of local field engineering, previously proposed by the research team.

Fundamental insights on scale-dependent phenomena in barium titanate-based ferroelectrics: critical grain size and effect of nanostructuring Call name: P 4 - Proiecte de Cercetare Exploratorie
PN-III-P4-ID-PCE-2016-0817 2017 - 2019

Role in this project: Key expert

Coordinating institution: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI

Project partners: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI (RO)

Affiliation: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI (RO)

Project website: http://stoner.phys.uaic.ro/projects/national-projects/ferroscale-pnii-idei.html

Abstract:

BaTiO3 is the prototype ferroelectric oxide, widely used in microelectronics due to its dielectric, piezo, pyro, ferroelectric and electro-optic properties, which can be tailored by substitutions and by microstructural factors (density, internal stress, morphology: size, shape, texture). In the last years, the miniaturization trend of the elements in microelectronics has imposed the need of developing new BaTiO3 based ceramics with reduced grain sizes towards few tenths of nanometers, which has opened a new fundamental research topic: the role of the grain size on the functional properties. Grain size is an important parameter to tailor the functional properties in BaTiO3 because around 1 micrometer some properties are maximized. However, for applications is essential to preserve high values for the material constants while reducing grain size at nanoscale. Understanding why enhanced properties are found at the critical grain size of 1 micrometer and extending to other systems the ways to reproduce such specific conditions to acquire enhanced properties is very challenging. The major goal of the present project is to clarify missing aspects concerning size-dependent phenomena in BT-based ferroelectrics by a novel experimental-modeling multiscale approach (macroscopic, mesoscopic and at nanoscale) and by a multidisciplinary study involving innovative chemistry for preparation, complex nano/microscale characterization, detailed investigation of the functional properties and multiscale complex modeling tools.

Magnetoelectric composites with emergent properties for wireless and sensing applications Call name: Joint Applied Research Projects - PCCA 2013 - call
PN-II-PT-PCCA-2013-4-1119 2014 - 2017

Role in this project: Key expert

Coordinating institution: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI

Project partners: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI (RO); GRADIENT S.R.L. (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA TEHNICA-IFT RA (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU TEHNOLOGII IZOTOPICE SI MOLECULARE I N C D T I M (RO)

Affiliation: UNIVERSITATEA "ALEXANDRU IOAN CUZA" IASI (RO)

Project website: http://stoner.phys.uaic.ro/projects/national-projects/213-mecomap-pnii-pt-ro.html

Abstract:

The aim of the present multidisciplinary project is to design by modeling&simulation, produce by innovative synthesis methods and various sintering strategies, to investigate the physico-chemical properties at various length scales of a few types of magnetoelectric composites with emergent properties in order to integrate them at industrial scale in a few types of new applications. Two types of devices based on magnetoelectric composites will be produced: (i) miniaturised magnetoelectric tunable reconfigurable antennas based on particulate ceramic composites; (ii) new types of sensors / transducers / actuators / harvesters based on layered magnetoelectric composites. The project will contribute to increase the consortium capacity to approach top research subjects in the field of smart multifunctional materials with high applicative potential. In terms of material science aspects, an important contribution will be given by a complex physico-chemical experimental – modeling approach for understanding the relationship between composition, micro/nanostructural parameters and functional properties of the magnetoelectric composites with different degrees of phase connectivity. The composition, phase interconnectivity and microstructures will be optimised and the best composite structures will be selected for the proposed applications. By considering the dielectric, ferro/piezoelectric and magnetoelectric properties of the produced composites, new magnetoelectric devices will be designed, realised, tested and optimised and the best solutions in terms of both technical parameters and cost efficiency will be implemented as prototypes by the industrial partner. The new devices are expected to contribute to the increase of the company performances by extending its production capacities, by extending the number of high specialised employees and the number of its beneficiaries. The overall scientific goal is to improve the knowledge in the field of multifunctional magnetoelectric composite structures at different levels (macroscopic, mesoscopic and at nanoscale) in order to generate properties beyond the present ones and to integrate them into new magnetoelectric devices with superior characteristics and low cost.

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects