National Institute Of Materials Physics - Romania

Atomic Structures and Defects in Advanced Materials Laboratory

About us

The lab has been created on January 1-st 2010 after the internal re-organisation of NIMP, by grouping scientists with related fields of interest and expertise in solid state physics and materials science.
Our research activity concerns mainly the physical properties – such as structure, optical, electrical properties – in advanced materials, resulting either as size effects (nanostructures, thin films) or by engineering of structural defects. Although the size scale available through our investigation techniques spans from bulk to nanometric and atomic structures, our research is mainly directed towards the discovery, investigation and manipulation of physical properties at nanometric and atomic scale for the development and characterisation of new materials (dielectrics, semiconductors, alloys, ceramics) to be used in various applications (semiconductor technology, gas sensing, radiation detectors, telecommunications).

 Among the approached topics, we mention:

  • Investigations down to atomic scale by microstructural (TEM/HRTEM/STEM, XRD), spectroscopic (EPR, Mossbauer spectroscopy, EELS, EDS) and optical methods of native and induced defects in bulk and nanostructured solid materials.
  • Investigations of material properties by using paramagnetic point defects as atomic probes.
  • Investigations of the changes induced by defects in ordered and partially disordered solids.
  • Synthesis of oxide semiconducting or magnetic nanostructures for applications in gas sensing, catalysis and photocatalysis.
  • Hyperfine interactions in solids.
  • Modelling of order-disorder transformations in crystalline media and transient phenomena in condensed matter.

A wide variety of investigation techniques and state-of-the-art equipments for materials synthesis, processing and characterization are available in our laboratory:

     Structural methods

  • Analytical Transmission Electron Microscopy (TEM/HRTEM, STEM, EFTEM, EELS, EDS).
  • Analytical Scanning Electron Microscopy and Focused Ion Beam (SEM-FIB, EDS, EBSD).
  • Powder, thin film and single crystal X-ray diffraction (XRD).

     Spectroscopic methods

  • Multifrequency Electron Spin/Paramagnetic Resonance (ESR/EPR) spectroscopy.
  • Mössbauer spectroscopy (57Fe, 151Eu, 119Sn, TMS, SMS and CEMS) techniques.
  • Optical spectroscopy (absorption and emission).

     Gas-sensing measurements

  • Complex electrical measurements under controlled gas atmosphere for gas sensing (Gas Mixing Station).
  • Gas-mixing installation.
  • Catalytic investigations (Photo-acoustic gas analyzer).
  • Relative work function investigations (Kelvin Probe).

     Materials synthesis

  • Single-crystal growth from melt (Czochralski, Bridgman).
  • Preparation of nanocrystalline materials by co-precipitation, solvothermal method and high energy ball milling.

Latest Publications

Grain size-driven effect on the functional properties in Ba0.6Sr0.4TiO3 ceramics consolidated by spark plasma sintering
Authors: Patru, RE; Stanciu, CA; Soare, EM; Surdu, VA; Trusca, RD; Nicoara, AI; Vasile, BS; Boni, G; Amarande, L; Horchidan, N; Curecheriu, LP; Mitoseriu, L; Pintilie, L; Pintilie, I; Ianculescu, AC

Published: JUL 2023, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 43, DOI: 10.1016/j.jeurceramsoc.2023.02.013

Carbon-based heterostructure from multi-photo-active nanobuilding blocks SrTiO3@NiFe2O4@Fe0@Ni0@CNTs with derived nanoreaction metallic clusters for enhanced solar light-driven photodegradation of harmful antibiotics
Authors: Borhan, AI; Ghemes, AI; Husanu, MA; Popescu, DG; Borca, CN; Huthwelker, T; Radu, I; Dirtu, AC; Dirtu, D; Bulai, G; Lupu, N; Palamaru, MN; Iordan, AR; Gherca, D

Published: JUN 15 2023, APPLIED SURFACE SCIENCE, 622, 156987, DOI: 10.1016/j.apsusc.2023.156987

Thermoelectric properties of p-type Mg2Si0.3Sn0.7 doped with silver and gallium
Authors: Assahsahi, I; Popescu, B; El Bouayadi, R; Zejli, D; Enculescu, M; Galatanu, A

Published: MAY 25 2023, JOURNAL OF ALLOYS AND COMPOUNDS, 944, 169270, DOI: 10.1016/j.jallcom.2023.169270

Development of ceramic coatings on titanium alloy substrate by laser cladding with pre-placed natural derived-slurry: Influence of hydroxyapatite ratio and beam power
Authors: Mocanu, AC; Miculescu, F; Stan, GE; Tite, T; Miculescu, M; Tierean, MH; Pascu, A; Ciocoiu, RC; Butte, TM; Ciocan, LT

Published: APR 1 2023, CERAMICS INTERNATIONAL, 49, DOI: 10.1016/j.ceramint.2022.11.227

An improved balanced replicated sampling design for preliminary screening of the tailings ponds aiming at zero-waste valorization. A Romanian case study
Authors: Pencea, I; Turcu, RN; Popescu-Arges, AC; Timis, AL; Priceputu, A; Ungureanu, C; Matei, E; Nedelcu, L; Petrescu, MI; Niculescu, F

Published: APR 1 2023, JOURNAL OF ENVIRONMENTAL MANAGEMENT, 331, 117260, DOI: 10.1016/j.jenvman.2023.117260

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