Low temperature structural characterisation of nickel and copper hexa-ammineammonia storage materials
We are applying for three days of beamtime to investigate the low temperature structures of the three potential ammonia storage materials [Ni(NH3)6]Cl2, [Ni(NH3)6](NO3)2 and Cu(NH3)6-x]Cl2 (resp. their deuterium analogues). The room temperature structures are of high symmetry (Fm-3m for the Ni compounds and I4/mmm for the Cu compound) and show considerable disorder with respect to the ammonia position (and nitrate for [Ni(NH3)6](NO3)2). The low temperature phase transitions are suspected to be due to ordering of the ammonia groups and are therefore best studied with neutron diffraction. Additionally, the multiple low temperature phases of nitrate have only been partially explored in previous studies. We aim to gain a deeper insight into the structure property relationships in metal ammines in order to tune their characteristics when employed as ammonia storage material.
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GREGORY Duncan; BRETERNITZ Joachim and Thomas C. Hansen. (2015). Low temperature structural characterisation of nickel and copper hexa-ammineammonia storage materials. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-571
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