Subscribe to our free daily newsletters
  Space Industry and Business News  




Subscribe to our free daily newsletters



Argonne Scientists Discover New Class Of Glassy Material

Common window glass.
by Staff Writers
Argonne IL (SPX) Aug 05, 2008
Scientists at U.S. Department of Energy's Argonne National Laboratory are dealing with an entirely new type of frustration, but it's not stressing them out.

Dynamic frustration has been found to be the cause of glassy behavior in materials that previously had none of the features of a normal glass.

"This has been a puzzle for 10 years now," Argonne physicist Raymond Osborn said.

Conventional wisdom states that glassy materials, such as common window glass, result when frustration prevents the atoms from forming a well-ordered crystal structure, and the material freezes into a disordered state like a frozen liquid.

In spin glasses, it is the magnetic moments on each atom, rather than the atoms themselves, that freeze into a disordered state at low temperatures, so that they point in random directions. However, there has to be some disorder in the atomic structure and some frustration in the magnetic interactions which prevents the magnetic moments from ordering so that they can freeze into spin glasses.

Scientists have struggled for more than a decade to understand why PrAu2Si2 is a spin glass. There is no sign of atomic disorder in the compound and, no reason for the magnetic interactions to be frustrated.

Using the results of neutron scattering experiments, Osborn and his collaborators concluded the frustration results from temporal or dynamic frustration rather static frustration.

Although PrAu2Si2 seems to have an ordered structure, by delving deeper, Osborn found that the magnetic moments are continually fluctuating in magnitude causing the equivalent of temporal potholes that appear and then disappear long enough to disrupt the magnetic alignment.

These fluctuations occur because the magnetic moments in this material are unstable and can be destroyed temporarily by electrons scattering off the atoms.

"The discovery of dynamic frustration reveals a whole new class of glassy materials whose behavior is governed by dynamic rather than static disorder," Osborn said.

This discovery may allow scientists to tune the degree of frustration and therefore develop a better understanding of how glasses are formed in nature.

Related Links
DOE/Argonne National Laboratory
Space Technology News - Applications and Research



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


Scientist says feathers are future of Asia construction
Manila (AFP) Aug 3, 2008
A Filipino scientist says he has created a new composite building board made of chicken feathers that could be a major breakthrough for the construction industry in Asia.







  • Yahoo board re-elected after blasting by shareholders
  • China has 'nothing to fear' from Internet: White House
  • Internet Addiction Growing Around The World
  • Ex-Google workers launch Internet search rival Cuil

  • Proton Launch With Inmarsat Satellite Delayed
  • SpaceX Conducts Full Thrust Firing Of Falcon 9 Rocket
  • Superbird 7 Is Readied For Ariane 5's August Mission
  • IBEX Satellite Ready For Integration With Pegasus Launch Vehicle

  • NASA evaluates new wing sensor
  • Russia And China May Co-Design New Passenger Plane
  • China Southern Airlines managers take paycut due to oil prices
  • British PM blasts polluting 'ghost' flights

  • Defense Support Program Satellite Decommissioned
  • Raytheon Bids For USAF Command And Control Contract
  • Northrop Grumman Demonstrates Multi-Function Electronic Warfare System
  • New Military Communications System Progressing At Lockheed Martin

  • Argonne Scientists Discover New Class Of Glassy Material
  • Satgate Contracts Four Transponders At New SES ASTRA Orbital Position
  • Scientist says feathers are future of Asia construction
  • Seanodes Computing Solution In The Stars For NASA Astrophysics Group

  • Edwin Miller Leads Reusable Solid Rocket Booster Project
  • Raytheon Network Centric Systems Names Green VP Joint Operations And Integration
  • NASA Names Strain New Goddard Space Flight Center Director
  • Raytheon IDS Names Del Checcolo Vice President, Engineering

  • ESA Meets Increasing Demand For Earth Observation Data
  • Tropical Storm Edouard Steams Toward Texas And Louisiana
  • Global Air Quality Checks Delivered Hourly From Space
  • Ocean Surface Topography Mission/Jason 2 Begins Mapping Oceans

  • Mobile Social Networking Global Revenues Over 3 Billion Dollars By 2013
  • GyPSii Social Networking Goes Mobile In China On Ramar Phones
  • First-Ever Free-Swimming Leatherback Turtles In New England Tagged
  • India To Soon Get Global Navigation System

  • The content herein, unless otherwise known to be public domain, are Copyright Space.TV Corporation. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space.TV Corp on any Web page published or hosted by Space.TV Corp. Privacy Statement