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Effect of pressure on phase transitions in K1−xNaxMnF3 (x = 0.04) by S. Åsbrink; A. Waśkowska; H. G. Krane; L. Gerward; J. Staun Olsen is a Materials Science article available to read on EtoBox.

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The pressure-induced phase transition sequence in the title compound, potassium sodium ̄uoromanganate, has been investigated by single-crystal X-ray diffraction using synchrotron radiation and a diamond anvil pressure cell. Na ions at 4% of the K sites shift the ferrodistortive phase transition to the lower pressure P c1 of 2.75 (5) GPa compared to 3.12 GPa in the parent compound KMnF 3 . The transition is illustrated by the critical behaviour of the unit-cell dimensions, the pressure-dependent evolution of the MnF À 6 octahedral rotation and related macroscopic spontaneous strain. As far as precision of the present experiment allows, the observations show that the 4% of Na admixture at the K sites does not substantially change the nature of the transition at P c1 . The main effect of pressure is to stabilize the tetragonal phase II. The expected further evolution of the MnF À 6 octahedral tiltings, leading to the orthorhombic and monoclinic phases, has not been observed up to 8.33 GPa.

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Author

S. Åsbrink; A. Waśkowska; H. G. Krane; L. Gerward; J. Staun Olsen

Publisher

International Union of Crystallography; Blackwell Publishing Inc.; International Union of Crystallography (IUCr) (ISSN 0021-8898)

Published

1999

Language

EN

Field

Materials Science (Physical Sciences)