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SUMMARY:Hydrates under pressure – new insights from sulfuric acid hydrat
 es
DTSTART;VALUE=DATE-TIME:20160204T004500Z
DTEND;VALUE=DATE-TIME:20160204T010000Z
DTSTAMP;VALUE=DATE-TIME:20260809T075346Z
UID:indico-contribution-486@events01.synchrotron.org.au
DESCRIPTION:Speakers: Helen Maynard-Casely (Australian Nuclear Science and
  Technology Organisation)\nHydrates are a rich and diverse class of materi
 als that display a wide range of structures and properties – a feature t
 hat is only exaggerated when they are subjected to high-pressures.  Conseq
 uently\, these have implications on our understanding of many outer solar 
 system bodies\, where hydrates are amongst the dominant materials found th
 ere.  \n\nFor Europa and Ganymede\, two moons under intense investigation 
 from past and future space missions\, their surfaces seen to be mostly wat
 er-ice and hydrates.  Despite the apparent ‘simplicity’ of these mater
 ials\, we still observe very complex geological formations on these moons 
 – including subduction [1].  Hence\, we need to understand the transform
 ations of candidate surface materials under a range of pressure/temperatur
 e conditions in order to accurately explain the formations on these icy su
 rfaces. \n\nOne hydrate candidate material for the surfaces of these moons
  are sulfuric acid hydrates\, formed from radolytic sulfur (from Io) react
 ing with the surface ice.  Sulfuric acid hydrates have already been establ
 ished to have a complex phase diagram with composition [2].  \n\nWe have n
 ow used the Mito cell [3] at the PLANET instrument [4] to undertake the fi
 rst investigation of the high-pressure behavior of the water rich sulfuric
  acid hydrates.  Compressing at 100 K and 180 K we see that the hemitriska
 idekahydrate becomes the stable water-rich hydrate and observe some intere
 sting relaxation behaviour in this material at pressure\, which could have
  significant consequences for the interiors of Ganymede. \n\n1.    Kattenh
 orn\, S.A. and L.M. Prockter\, Evidence for subduction in the ice shell of
  Europa. Nature Geosci\, 2014. 7(10): p. 762-767.\n2.    Maynard-Casely\, 
 H.E.\, H.E.A. Brand\, and K.S. Wallwork\, Phase relations between the wate
 r-rich sulfuric acid hydrates\, potential markers of thermal history on Ju
 piter’s icy moons. Icarus\, 2014. 238(0): p. 59-65.\n3.    Komatsu\, K.\
 , et al.\, Development of a new P–T controlling system for neutron-scatt
 ering experiments. High Pressure Research\, 2013. 33(1): p. 208-213.\n4.  
   Hattori\, T.\, et al.\, Design and performance of high-pressure PLANET b
 eamline at pulsed neutron source at J-PARC. Nuclear Instruments and Method
 s in Physics Research Section A: Accelerators\, Spectrometers\, Detectors 
 and Associated Equipment\, 2015. 780(0): p. 55-67.\n\nhttps://events01.syn
 chrotron.org.au/event/19/contributions/486/
LOCATION:
URL:https://events01.synchrotron.org.au/event/19/contributions/486/
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