44 Current news of Helmholtz-Zentrum Berlin für Materialien und Energie

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When vibrations increase on cooling: Anti-freezing observed

Completely unusual and never observed like this before

10-Aug-2021

An international team has observed an amazing phenomenon in a nickel oxide material during cooling: Instead of freezing, certain fluctuations actually increase as the temperature drops. Nickel oxide is a model system that is structurally similar to high-temperature superconductors. The experiment ...

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Water detected as a metal at BESSY II

02-Aug-2021

Under normal conditions, pure water is an almost perfect insulator. Water only develops metallic properties under extreme pressure, such as exists at most in the interior of large planets. Now, an international collaboration has used a completely different approach to produce metallic water and ...

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Perovskite Solar Cells: Insights into early stages of structure formation

Colloidal chemistry of perovskite precursor solutions investigated

25-Jun-2021

Using small-angle scattering at the PTB X-ray beamline of BESSY II, an HZB team was able to experimentally investigate the colloidal chemistry of perovskite precursor solutions used for solar cell production. The results contribute to the targeted and systematic optimization of the manufacturing ...

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New insights into switchable MOF structures

03-Jun-2021

Metal-organic framework compounds (MOFs) are widely used in gas storage, material separation, sensor technology or catalysis. A team led by Prof. Dr. Stefan Kaskel, TU Dresden, has now investigated a special class of these MOFs at the MX beamlines of BESSY II. These are "switchable" MOFs that can ...

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Solar cells: Losses made visible on the nanoscale

19-Mar-2021

Solar cells made of crystalline silicon achieve peak efficiencies, especially in combination with selective contacts made of amorphous silicon (a-Si:H). However, their efficiency is limited by losses in these contact layers. Now, for the first time, a team at Helmholtz-Zentrum Berlin (HZB) and ...

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An efficient tool to link X-ray experiments and ab initio theory

Results can even be calculated during the experiment

01-Feb-2021

The electronic structure of complex molecules and their chemical reactivity can be assessed by the method of resonant inelastic X-ray scattering (RIXS) at BESSY II. However, the evaluation of RIXS data has so far required very long computing times. A team at BESSY II has now developed a new ...

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Nanopatterns of proteins detected by cryo-electron microscopy

Nanostructures for electronics, catalysis, medicine

22-Oct-2020

A team from Helmholtz-Zentrum Berlin (HZB) used cryo electron microscopy to detect regular, two-dimensional structures in the form of Pascal triangles in a shock frozen protein material. The samples have been synthesized by a Chinese research group. The method of cryo electron microscopy has the ...

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Corona research at BESSY II: Two days of measuring operation to find the right key

03-Apr-2020

The Berlin Synchrotron Source BESSY II of the Helmholtz-Zentrum Berlin (HZB) will resume operation for two days. Scientists intend to use the intense X-ray radiation from BESSY II to search for active substances against the corona virus SARS-CoV2. Almost two hundred samples from an important ...

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Ultra-fast switching of helicity of circularly polarized light pulses

The ultra-fast change of light helicity is particularly interesting to observe processes in magnetic materials

03-Apr-2020

At the BESSY II storage ring, a joint team of accelerator physicists, undulator experts and experimenters has shown how the helicity of circularly polarized synchrotron radiation can be switched faster - up to a million times faster than before. They used an elliptical double-undulator developed ...

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Using neutrons and X-rays to analyse the ageing of lithium batteries

11-Feb-2020

An international team has used neutron and X-ray tomography to investigate the dynamic processes that lead to capacity degradation at the electrodes in lithium batteries. Using a new mathematical method, it was possible to virtually unwind electrodes that had been wound into the form of a compact ...

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