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High-pressure structural evolution of the perovskite NH4MnCl3

Abstract: The high-pressure evolution of the cubic perovskite NH4MnCl3 has been studied in the 0-6 GPa range by angle-dispersive x-ray diffraction. A structural phase transition has been found at low pressure (PC= 0.4 GPa), in agreement with previous reports. The high-pressure phase has been refined in the tetragonal P4/mbm and orthorhombic Pbnm space groups. In either case, the structure can be described in terms of a tilted perovskite model (one tilt a0a0c+and two tilts a+bb-, respectively). The average tilting under pressure has been estimated fromthe lattice parameters. The P-V relation has been fitted by a Murnaghan Equation-of-State with K0 =29(2) GPa and K?0 = 9(1).

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Authorship: Aguado F., Rodriguez F., Lennie R.,

Congress: International Conference on High Pressure Science and Technology, Joint AIRAPT-22 & HPCJ-50 (22º : 2009 : Tokio)

Publisher: Institute of Physics

Year of publication: 2010

No. of pages: 4

Publication type: Conference object

DOI: 10.1088/1742-6596/215/1/012009

ISSN: 1742-6588,1742-6596

Spanish project: MAT2008-06873-C02-01/MAT

Publication Url: https://doi.org/10.1088/1742-6596/215/1/012009

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Authorship

FERNANDO AGUADO MENENDEZ

FERNANDO RODRIGUEZ GONZALEZ

LENNIE, A. R.

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