Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Framework materials yield to pressure

11.06.2015

Pressure is a powerful thermodynamic variable that enables the structure, bonding and reactivity of matter to be altered. In materials science it has become an indispensable research tool in the quest for novel functional materials.

Materials scientists can exploit the effectiveness of pressure for probing and tuning structural, mechanical, electronic, magnetic and vibrational properties of materials in situ; crystallography plays a crucial role, enabling on the one hand the unravelling of structural phenomena through a better understanding of interactions, and on the other shedding light on the correlation of structure and properties [Fabbiani (2015), Acta Cryst. B71, 247-249; doi: 10.1107/S2052520615009427].


This is a cobalt II octahedral packing diagram as viewed in the (001) plane.

Credit: Yakovenko et al

With high pressure promoting effects such as magnetic crossover, spin transitions, negative linear compressibility, changes in proton conductivity, or even phase transitions that generate porous structures, high-pressure crystallographic studies on dense framework materials are on the rise.

More generally, coordination compounds are a fascinating class of materials for high-pressure crystallographic studies, compared with purely organic compounds; they have an inherent extra degree of flexibility for responding to moderate applied pressures, as the geometry at the metal centre can undergo marked changes, whereas other primary bond distances and angles remain largely unaffected.

A group of scientists [Yakovenko et al. (2015), Acta Cryst. B71, 252-257; doi: 10.1107/S2052520615005867] demonstrate that pressure offers a novel approach for generating new phases and exploring the structure-property relationships of molecular materials.

In their study the researchers present a high-pressure crystallographic study of α -Co(dca)2, including the structural determination of the high-pressure phase γ -Co(dca)2. The pressure-dependence of the atomic structure was probed within a diamond-anvil cell using synchrotron-based powder diffraction methods.

Future work from the group based at Argonne National Laboratory will involve investigations of the pressure-dependent structures of further transition metal dicyanamides, including members of the iso-structural α-MII(dca)2 family as well as other polymorphs, to uncover any universality or metal-ion dependence associated with the α?γ transition, and if other new phases can be generated.

Media Contact

Dr. Jonathan Agbenyega
ja@iucr.org
44-124-434-2878

 @iucr

http://www.iucr.org 

Dr. Jonathan Agbenyega | EurekAlert!

More articles from Materials Sciences:

nachricht Argon is not the 'dope' for metallic hydrogen
24.03.2017 | Carnegie Institution for Science

nachricht Researchers make flexible glass for tiny medical devices
24.03.2017 | Brigham Young University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>