A5006003753- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Advanced Antenna and Metasurface Technologies
- Perovskite Materials and Applications
- Microwave Dielectric Ceramics Synthesis
- Photonic and Optical Devices
- Electronic and Structural Properties of Oxides
- Antenna Design and Analysis
- RFID technology advancements
- ZnO doping and properties
- Iron oxide chemistry and applications
- Acoustic Wave Resonator Technologies
- Nanomaterials for catalytic reactions
- Quantum Dots Synthesis And Properties
- 3D Printing in Biomedical Research
- Nanoparticle-Based Drug Delivery
- Solid-state spectroscopy and crystallography
- Gold and Silver Nanoparticles Synthesis and Applications
- Semiconductor materials and devices
- Copper-based nanomaterials and applications
- Synthesis and properties of polymers
- Photonic Crystals and Applications
- Micro and Nano Robotics
University of Southampton
2016-2024
Foundation for Research and Technology Hellas
2010-2018
University of Crete
2010-2017
Astronomy and Space
2016
FORTH Institute of Electronic Structure and Laser
2011
We demonstrate that ethylammonium copper chloride, ${({\text{C}}_{2}{\text{H}}_{5}{\text{NH}}_{3})}_{2}{\text{CuCl}}_{4}$, a member of the hybrid perovskite family is an electrically polar and magnetic compound with dielectric anomaly around Curie point (247 K). have found large spontaneous electric polarization below this accompanied color change in sample. The system also ferroelectric, remnant $(37\text{ }\ensuremath{\mu}\text{C}/{\text{cm}}^{2})$ comparable to classical ferroelectric...
A method for water-soluble Mn doped iron oxide clusters and their magnetic properties.
New polymorphs of NaMnO2 have been observed using transmission electron microscopy and synchrotron X-ray powder diffraction. Coherent twin planes confined to the (NaMnO2) layers, parallel (101̅) crystallographic monoclinic layered rock-salt-type α-NaMnO2 (O3) structure, form quasi-periodic modulated sequences, with known α- β-NaMnO2 as two limiting cases. The energy difference between polymorphic forms, estimated a DFT-based structure relaxation, is on scale typical thermal energies that...
This paper presents a multibeam dual-circularly polarized (CP) reflectarray for connected and autonomous vehicles. The developed uses one aperture to realize dual-band operation. At each frequency band, there are two simultaneously shaped beams with different circular polarizations. Totally four obtained single feed of the can be independently controlled. A simple but effective polarization suppression technique is introduced suppress cross polarizations at large scan angles so CP beam...
Na(0.40(2))MnO(2) belongs to a family of mixed Mn(3+) and Mn(4+) porous oxides that contains both octahedral square pyramidal Mn-O units. Neutron synchrotron radiation studies identify the presence sodium ordering (T(Na) ≈ 310 K) Mn charge orbital ordering. Below T(Na), centrosymmetric Pbam structure adopts an (ab 4c) supercell Pnnm symmetry accommodates coupled commensurate modulation down c-axis channels Na position occupancy with valence.
The integration of lead zirconate titanate (Pb(ZrxTi1-x)O3) (PZT) compounds on Si substrates with a smooth surface would provide key technology for silicon photonic devices. quality the deposited thin film is critical in order to integrate Pb(ZrxTi1-x)O3 applications such as pyroelectric mid-infrared detectors or optical modulators. Here, we have applied physical vapour deposition technique using modified molecular beam epitaxy tool deposit perovskite and Pt substrates. We developed method...
Birnessite compounds are stable across a wide range of compositions that produces remarkable diversity in their physical, electrochemical, and functional properties. These hydrated analogs the magnetically frustrated, mixed-valent manganese oxide structures, with general formula, $\mathrm{N}{\mathrm{a}}_{x}\mathrm{Mn}{\mathrm{O}}_{2}$. Here we demonstrate direct hydration layered rock-salt type \ensuremath{\alpha}-$\mathrm{NaMn}{\mathrm{O}}_{2}$, geometrically frustrated triangular lattice...
(BaSr)/(TiMn)O<sub>3</sub> dielectric thin films prepared by combinatorial synthesis are used in tunable co-planar waveguides which allowed measurements at frequencies exceeding 10 GHz.
The layered $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{NaMn}{\mathrm{O}}_{2}$, a promising Na-ion energy-storage material, has been investigated for its triangular lattice capability to promote complex magnetic configurations that may release symmetry restrictions the coexistence of ferroelectric and orders. complexity neutron powder diffraction patterns underlines routinely adopted commensurate structural models are inadequate. Instead, single-phase superspace description is necessary,...
Barium strontium titanate (BSTO) thin films were deposited on Pt(111) by high throughput evaporative physical vapor deposition and then annealed at 650 \ifmmode^\circ\else\textdegree\fi{}C for 30 min under ${\mathrm{N}}_{2}$ atmosphere. Using advanced transmission electron microscopy, energy-dispersive x-ray spectroscopy energy-loss spectroscopy, we directly show that not only does N substitute O in the BSTO lattice but it also compensates $\mathrm{T}{\mathrm{i}}^{3+}$ ions, suppressing...
BaxSr1-xTiyMn1-yO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> BSTO thin films have been synthesized using a molecular beam epitaxy system. Novel coplanar waveguide tunable phase shifters developed these Mn-doped perovskite films. The presented operate with shift angle of 12 degrees at 10GHz. an applied bias 10V on area smaller than 1mm <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , Insertion loss ~3.2 dB is extracted from...
This paper presents a novel continuously beam-steering dual-band, dual circularly polarized (CP) reflectarray. The band operation of the reflectarray is obtained by using interleaved triangular patches as radiating elements. Each has two proximity feed lines that are electromagnetically coupled to branch line coupler, where phase shifters integrated. shifter realized new type high-frequency tunable dielectric materials, Lead Niobate Pyrochlores Pb <sub...
In this paper we present our recent studies on the crystal, magnetic and dielectric properties of β-NaMnO<sub>2</sub>. Experimental results neutron powder electron diffraction combined with measurements permittivity suggest that β-ΝaMnO2 is an excellent candidate for studying coupling between electric degrees freedom. Neutron data reveal existence a commensurate incommensurate structure at 200 K below 100 K, respectively. Dielectric anomalies which appear temperature regions where two...
The integration of Pb(ZrxTi1-x)O3 compounds on Si substrates with a smooth surface would provide key technology for silicon photonic devices. quality the deposited thin film is critical in order to integrate PZT films potential applications, such as pyroelectric sensors or optical waveguides. We have applied modified molecular beam epitaxy technique based combinatorial synthetic methodology fabricate perovskite and Pt substrates. Direct growth was achieved. situ attempted. However, method...