MaMaSELF Status Meeting 2015

Session

Student Sessions

27 May 2015, 08:45

Main Lecture Hall (Hotel Rigi Kulm)

Conveners

Student Sessions: Early Morning Session Wednesday (I)

• Martin Meven (RWTH Aachen)

Student Sessions: Later Morning Session Wednesday (II)

• Werner Paulus (Université Montpellier 2)

Student Sessions: Early Afternoon Wednesday (III)

• Sergio Di Matteo (Université Rennes 1)

Student Sessions: Early Morning Session Thursday (IV)

• Sergio Di Matteo (Université Rennes 1)

Student Sessions: Later Morning Thursday (V)

• Werner Paulus

Student Sessions: Early Afternoon Thursday (VI)

• Juerg Schefer (Paul Scherrer Institut)

Student Sessions: Later Afternoon Session Wedneday (VII)

• Michal Banaszak (Adam Mickiewicz University)

60. Temperature dependent oxygen disorder in Pr(2-x)Sr(x) NiO(4+δ) by high-resolution single crystal neutron diffraction on HEIDI@MLZ

Mr Sumit Ranjan Maity (Technical university of Munich)

27/05/2015, 08:45

Mixed-ionic electronic conductors (MIEC) offer significant advantages over conventional cathodes especially in the intermediate temperature range for solid oxide fuel cell applications. In this context, Ruddlesden-Popper type layered oxides have taken much attention. Among them Pr2 NiO(4+δ) is a promising candidate as it offers high electronic conductivity similar to those conventional cathode...

48. Next Generation III-V Nanowire-based Heterostructure Solar Cells and Photodetectors Integrated on Silicon

Mr XiaoMo Xu (Walter-Schottky-Institut; MaMaSELF)

27/05/2015, 09:15

III-V based nanowire (NW) heterostructures are one of the most promising candidates for future opto-electronic devices like light emitters and detectors, particularly when integrated onto the well-developed Silicon (Si) platform. Using nano-imprint lithography (NIL) to prepattern Si (111) wafer, NW arrays with very high growth yield (>90%) can be achieved over large–scale areas. Developing a...

43. Power Die Embedding in a Power Electronics Converter

Mr RODRIGO LEITE PINTO (MaMaSELF)

27/05/2015, 09:45

This project, born from a partnership between Mitsubishi Electric R&D Centre Europe (MERCE) and the Ampère Laboratory in Lyon (France), consists in the enhancement of the design of conventional heat sinks, ubiquitous elements used in power electronics systems as heat dissipating units. The final goal of this project is to design, fabricate and validate a novel packaging solution that reduces...

59. High temperature chemical reactivity of potential SOFC materials in dry and wet gas atmospheres investigated by thermal analysis and in situ neutron powder diffraction

Mrs Tamara Mollon (Universitée Rennes 1)

27/05/2015, 10:45

Solid oxide fuel cells (SOFC) working around 900 ℃ have drawn a growing interest in the field of energy. Their operating temperature allows the use of complex combustible gases at the anode (natural gas, biomass gas). To prevent carbon deposition, contamination by sulfur and aging of the composite in the presence of water, one of the major challenges remains the replacement of the standard...

41. Developing High Entropy Alloys for High Temperature Applications

Mr Cagri Kiray (Mamaself)

27/05/2015, 11:15

High Entropy Alloys (HEAs) are defined as alloys consisting of five or more elements with concentration between 5 to 35 at%. Contrary to conventional alloys in which the main component provides a primary property and the alloying elements allocate secondary ones, HEAs involve usually 5 elements forming simple solid solutions rather than complex microstructures because of significant role of...

63. Interplay between structural complexity and magnetism in non-stoichiometric Pr2NiO(4+d) single crystals.

Mr Shantanu Mishra (Paul Scherrer Institut/Université Montpellier)

27/05/2015, 11:45

Non-stoichiometric Pr2NiO(4+d) has emerged as a model system for its application as oxygen conductor in solid oxide fuel cells due to ambient oxygen conductivity, thermal stability at higher temperatures, large oxygen solubility range and a large fully-reversible oxygen uptake window. It is also thought that introduction of interstitial oxygen activates specific low-energy phonon modes that...

55. "The electronic structure of luminescent centers in doped phosphors"

Ms Asmaa Ali (Egyptian)

27/05/2015, 14:00

Barium magnesium aluminates doped with europium and manganese (BaMgAl10O17 (BAM): Eu+2 (1%) and Mn+2 (1%)) is widely used as phosphors material in optics and electronics applications, e.g. PDPs (Plasma Display Panels), lamps, and LEDs (Light Emitting Diodes). Despite their widespread use the exact reason for the varying luminescent efficiency is not known and neither is the exact position of...

40. The combined effect of recycled aggregate implementation and cement overdosage on the durability properties of high performance concrete

Mr Theo Collin (mamaself)

27/05/2015, 14:30

Since awareness of sustainable development, the construction industry has been searching for a way to reuse their wastes. The use of recycled aggregates (RA) in concrete is an interesting alternative. RA are composed of natural aggregates (NA) surrounded by an old mortar, which makes them more porous, lighter and more water absorbing compare to NA. The substitution rate of NA by RA plays a...

45. Monte Carlo Simulation of Terahertz Quantum Cascade Lasers

Mr Ivan Ezhov (TU Munich)

27/05/2015, 15:00

Despite having multitude of potential applications as unique observations of characteristic vibrational and rotational molecular lines, non-ionizing bio-medical imaging, etc. the terahertz frequency range of the electromagnetic spectrum remains comparatively underdeveloped with respect to the nearby microwaves and infrared regions, mainly due to the lack of compact and efficient emission...

58. Magnetoresistance in electron under-doped cuprate superconductor Nd2-xCexCuO4

Mr Ahmed Alshemi (Master Student -Technical university of Munich)

27/05/2015, 15:30

High-temperature cuprate superconductors (HTSC) are materials that become superconducting at unusually high temperatures. The interplay between antiferromagnetic (AF) and superconductivity (SC) is one of the most fascinating phenomena in the HTSC . The parent compounds of all the high-Tc cuprates are AF Mott insulators. Upon doping the antiferromagnetism vanishes and superconductivity...

50. Tracking the photo-induced phase transition in breathing-crystals

Mr Sebastian Walfort (University of Rennes 1)

28/05/2015, 09:00

The concept of photo-induced phase transitions and of time-resolved experiments will be illustrated on the basis of photoswitchable copper-nitroxide molecular magnets. Molecular compounds with photoswitchable magnetic properties have been intensively investigated over the last decades due to their prospective applications in nanoelectronics, sensing and magnetic data storage. As a more recent...

49. Substrate-effect on Structural and Orientational properties of ZnO Thin Film-systems Grown by Pulsed Laser Deposition

Mr Pelle Garbus (MaMaSELF)

28/05/2015, 09:30

Ever since the discovery of GaN-based blue LED systems, renewed interests have sprouded around ZnO for similar applications. The arrival of blue LED has in turn facilitated the commercial availibility of white light LED. Then ZnO, a widebandgab and inexpensive semiconductor, has huge potential to catalyse a small energy-saving revolution in terms of making low-cost acquisition, highly...

54. CDW - MH phase transition in [Pd(cptn)2Br]Br2 studied by 3D-PDF

Mr Edoardo Zatterin (Univ. Rennes 1)

28/05/2015, 10:30

The occurrence of a Mott-Hubbard (MH) to Charge-Density-Wave (CDW) phase transition in the quasi-one-dimensional Bromo-bridged Pd compound [Pd(cptn)2Br]Br2 (cptn = (1R,2R)-trans-1,2-Cyclopentadiamine) was investigated by means of single crystal X-ray diffraction employing the novel 3D-∆PDF method. Raman and STM measurements indicate that the phase transition occurs slightly above 100K and that...

42. Synthesis and study of piezoelectric materials in α-quartz family

Mr Daniel Maslennikov (University Montpellier 2)

28/05/2015, 11:00

Piezoelectric materials which can be used at very high temperature without degradation are sought for the control system in severe environmental conditions. However, the use of a piezoelectric material at elevated temperature presents many challenges such as possible phase transition, chemical degradation or structural defect propagation which can cancel or drastically decrease the...

51. Investigating the magnetic structure of Ruthenium based 2H-perovskites.

Mr Simon Riberolles (Student)

28/05/2015, 11:30

We are currently investigating the magnetic behaviour of Sr3XRuO6 (X=Li, Na) [1], these compounds belong to the family of the hexagonal perovskite oxides A3A’BO6 [2]. Principal members of this family are Ca3Co2O6 [2,3], Sr3NiIrO6[4]; the most closely related member to the ones presented here is Ca3LiOsO6 [5]. These compounds are structurally characterized by infinite 1D chains of octahedra and...

44. Mechanical design and instrumentation of a tribology device

Mr Joseph Guyon Le Bouffy (MaMaSELF)

28/05/2015, 14:00

This work is part of the constant search of improvement for float glass manufacturing process (glazing for buildings or automobile). Nowadays, we have 2% of loss in the glass production due to flaws during the production. To solve that problem, we have to better understand the conditions in which we create defects. The float glass process requires the contact of hot glass with a colder metal...

52. Synthesis & Kinetics of Nanostructured Calcium Silicate Hydrates (C-S-H) with high Ca/Si ratio for applications in eco-friendly cement & concrete

Mr Bhuvanesh Srinivasan (EPFL Lausanne & LMU Munich)

28/05/2015, 14:30

Cement is one of the most widely used materials and its production is responsible for 5 - 8 % of yearly man-made global CO2 emissions. Calcium Silicate Hydrate (C-S-H) is the main product of the hydration of Portland cement and it’s the key for the strength in cement based materials. A better understanding of the kinetics and growth mechanism will throw us some light in arriving at a new...

38. Charge Density Wave Order in Doped Praseodymium Nickelate studied by Resonant Soft X-ray Scattering

Mr Francesco D'Acierno (MaMaSELF)

28/05/2015, 15:00

The solid oxide fuel cells (SOFCs) have attracted considerable attention due to their high energy conversion efficiency and lower production of pollutants. However, high temperature is needed creating issues related with compatibility, thermal expansion and stability. Therefore, oxide materials with high oxygen ion conductivity are of particular interest especially in their applications as...

53. Platinum Ruthenium Core-shell Nanoparticles for H2 oxidation kinetics in alkaline media

Ms Anqi Li (Lichtenbergstraße 4, 85748 Garching, Germany)

28/05/2015, 15:30

As people concern about environment and clean energy production, hydrogen-based fuel cell attracts more and more attention of scientists. However, the rate of the hydrogen oxidation reaction (HOR) in the alkaline media is usually slow which limits the development of this promising energy source. Recently, a new type of catalyst—Pt0.1Ru0.9 was found to give a high activity for the HOR, which is...

56. Hybrid Assemblies Based on Plasmonic Semiconductors

Mr Doruk Ergöçmen (Photonics and Optoelectronics Group, Ludwig-Maximilians-Universität München, Munich (Germany); Nanosystems Initiative Munich (NIM), Munich (Germany))

28/05/2015, 17:00

Research on nanomaterials is becoming more and more popular each day as they find applications in many fields ranging from catalysis to drug delivery. Nanomaterials based on noble metals are of special interest, due to the fact that they can hold the so-called localized surface plasmon resonances upon interaction with light.1 Plasmonic nanomaterials however, are not limited to noble metal...

47. Experimental setup of HHG-ARPES and first test measurement on Au (111)

Mr Junwen ZOU (LMU München, Faculty of Physics)

28/05/2015, 17:30

Angular resolved photoemission spectroscopy (ARPES) is known to be a probe a powerful method to characterize the electronic band structure dispersion of crystalline solids. With the recent availability of laboratory scaled laser drive High Harmonic Generation sources (HHG) in the extreme ultraviolet, ARPES experiments can be performed with (sub-) femtosecond pulse and thus prove the way to...