Marmara Positron / Positronium Research and Service Laboratory (MARPOS)

Marmara Positron/Positronium Laboratory (MARPOS)

The Marmara Positron/Positronium Laboratory (MARPOS) was established to investigate the structural features of materials, particularly hole defects and free volumes at the atomic scale. The laboratory employs Positron Annihilation Lifetime Spectroscopy (PALS) and Doppler Broadening Annihilation Spectroscopy (DBS)—unique techniques capable of identifying structural holes in the range of 1 to 10 Å.

Founded within the Department of Physics at Marmara University, MARPOS has been supported by the State Planning Organization (DPT, now the Ministry of Development), TÜBİTAK, and Marmara University BAPKO. The laboratory actively participates in both national and international collaborations, conducting research on bulk and thin-film materials.

Research Focus

Bulk Materials

• Elucidation of conduction mechanisms in Li-batteries through structural hole analysis

• Correlation of free volume and characterization in composite materials (e.g., PU, PMMA, PE, and PS)

• Structural investigation of nano-doped polymers (e.g., PMMA) via free volume models

• Analysis of structural cavities in PAMAM dendrimers

Thin Films and Coatings

• Surface depth profiling of radiation-exposed materials (α, β, γ, and neutron irradiation)

• Characterization of materials through surface defect profiles as a function of film thickness

• Depth defect profiling of lanthanum-based perovskite thin films on glass and silicon substrates