%0 Journal Article
%A Mondal, Anshuman
%A Husband, Rachel
%A Liermann, H.-P.
%A Sanchez-Valle, Carmen
%T Equation of state of ammonia dihydrate up to 112 GPa by static and dynamic compression experiments in diamond anvil cells
%J Physical review / B
%V 107
%N 22
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M PUBDB-2023-03914
%P 224108
%D 2023
%X Understanding the high-pressure behavior of ammonia hydrates is relevant for modeling the interior of solarand extrasolar icy bodies. We present here the results of high-pressure x-ray diffraction studies on ammonia-dihydrate (ADH) at room temperature (298 K) up to 112 GPa, employing both static and dynamic compressionexperiments performed in diamond anvil cells. The derived pressure-volume (P-V) compression curves arein excellent agreement regardless of the compression technique. In contrast to early theoretical predictions,our results indicate the stability of the disordered molecular alloy (DMA) phase, a body centered cubic (bcc)structure, and the absence of self-ionization in the investigated pressure range. By combining the P-V data fromseven different compression runs, we derive the first equation of state for ADH-DMA based on the third-orderBirch-Murnaghan formalism with best-fit parameters: V<sub>0</sub> = 23.96 ± 0.03 (Å<sup>3</sup> /molecule), B<sub>0</sub> = 9.95 ± 0.14 GPa,and B′<sub>0</sub> = 6.59 ± 0.03. The instantaneous bulk modulus directly derived from the quasicontinuous compressioncurves displays a smooth increase upon compression that further supports the absence of structural transitions.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001058029800001
%R 10.1103/PhysRevB.107.224108
%U https://bib-pubdb1.desy.de/record/586486