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Low Temperature Phase Diagram of NH3BH3

Published online by Cambridge University Press:  08 March 2011

Bertil Sundqvist ,
Ove Andersson ,
Issam Quwar  and
Alexandr Talyzin
Bertil Sundqvist
Affiliation:
Department of Physics, Umeå University, SE-90187 Umeå, Sweden
Ove Andersson
Affiliation:
Department of Physics, Umeå University, SE-90187 Umeå, Sweden
Issam Quwar
Affiliation:
Department of Physics, Umeå University, SE-90187 Umeå, Sweden
Alexandr Talyzin
Affiliation:
Department of Physics, Umeå University, SE-90187 Umeå, Sweden
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Abstract

The pressure-temperature (p-T) phase diagram of NH3BH3 has been investigated by thermal conductivity measurements up to 1.5 GPa at temperatures between 100 and 300 K, and the phase boundaries between the three known structural phases have been identified. The transformation between the room temperature tetragonal I4mm phase and the low temperature orthorhombic Pmn21 phase (Tc = 218 K at p = 0) shows only a small hysteresis. The transformation into the high pressure orthorhombic Cmc21 phase (at 1.0 GPa near 292 K) has a very strong hysteresis, up to Δp = 0.5 GPa, and below 230 K a fraction of this phase is metastable even at atmospheric pressure.

Keywords

phase transformationenergy storagethermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1309: Symposium EE – Solid-State Chemistry of Inorganic Materials VIII , 2011 , mrsf10-1309-ee06-25
Copyright
Copyright © Materials Research Society 2011

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References

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