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Presentation

The Advanced Materials Research (AMR) Group is formed with staff from CTN (also members of the Nuclear Physics Centre of the University of Lisbon). This group is responsible for the operation of the Laboratory of Accelerators and Radiation Tecnologies (LATR).

Major activities of the Group are focused on the processing and characterization of advanced materials using ion beam based techniques. The work carried out during the last decades allowed the group to achieve a large expertise on the field of ion beams. The recognition of the work done is well patented by the large number of National and International collaborations.

Lately, the research activities of the group were centered mainly in two kinds of materials: wide bandgap semiconductors and oxides. The group maintains a strong collaboration with both the Aveiro and Strachlyde universities for the study of low dimension quantum structures.

Besides these research activities the group as also strongly engaged in training graduate and undergraduate students, through the supervision and work of MSc and PhD students, final year degree thesis and Socrates Students as well.

1. Main Activities

Acelerador Van de Graaff (jpg, 186.18 KB)

The research activities of the group have been focused on the investigation of advanced materials using ion beam based techniques. Studies in semiconductors include the doping of GaN and ZnO with optically and electrically active ions. These two wide bandgap semiconductors are under intense research all over the world due to the possibility of developing optoelectronic devices working in the visible wavelength range of the electromagnetic spectrum and spintronic applications. Our activity aims at the optimization of the implantation conditions of the dopants. Other relevant research work is being carried out in quantum well structures. An intense study of the structural properties of GaN/InGaN structures is under way in collaboration with the University of Aveiro and Strathclyd.

The work in oxides is a continuation of ongoing projects or bilateral collaborations to modify the optical and electrical properties of Al2O3 and MgO with transition metals.

The activity in the technology programme of the European Fusion Development Agreement in association with the Centro de Fusão Nuclear of the Instituto Superior Técnico was pursued as a strategic effort to include CTN in the European Fusion activities. Deliverables in several tasks were obtained, namely the study of compatibility of SiC/SiCf with other structural materials, surface studies of Be pebbles and structural studies of the new Eurofer(ODS) steel.

Running Projects

  • Ion implantation doping of ZnO and GaN with rare earths and transition metals (spintronics).
  • Transition metal nanoprecipitates formed by ion implantations on sapphire and magnesium oxide.
  • Analysis of nuclear fusion reactor materials and mineralogical samples.
  • Study of oxynitride coating thin films deposited by reactive magnetron sputtering.
  • Study of multiple quantum wells and quantum dots.

2. Equipment and Infrastructures

The LATR is equipped with a 2,5 MV Van de Graff accelerator, a 3 MV Tandem accelerator and a 210 kV high fluence ion implanter [REEQ/814/CTM/2005].

Other equipment and infrastructures (see map) operated:

  • Ion microprobe with a lateral resolution of 1,5 mm and external capacity analysis.
  • Accelerator mass spectroscopy (AMS) system with a lateral resolution of 30 mm.
  • Annealing furnaces with controlled atmosphere.
  • Laboratory for surface preparation (mechanical and chemical polishing).
  • Data acquisition systems.

3. Technical Services

How to apply for beam time

  • Mail, fax or e-mail the person in charge (see contacts).
  • Beam time allocation is supervised by the LATR Coordinator Doctor Eduardo Alves, and occurs once a month.