High-pressure structural evolution of the perovskite NH4MnCl3

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

Authors: Fernando Aguado (Universidad de Cantabria) , Fernando Rodriguez (Universidad de Cantabria) , Alistair Lennie (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: Joint AIRAPT-22 & PHCJ-50
Peer Reviewed: Yes

State: Published (Approved)
Published: March 2010

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 (P-C= 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 a(0)a(0)c(+) and two tilts a(+)b(-)b(-), respectively). The average tilting under pressure has been estimated from the lattice parameters. The P-V relation has been fitted by a Murnaghan Equation-of-State with K-0=29(2) GPa and K-0'=9(1).

Subject Areas: Chemistry, Materials

Facility: SRS Daresbury

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