25-27 November 2015
National Centre for Synchrotron Science
Australia/Melbourne timezone

Investigation of the Phase Transition of CuSb2O6 at High Temperatures by Synchrotron Powder Measurements

27 Nov 2015, 13:30
National Centre for Synchrotron Science

National Centre for Synchrotron Science

Australian Synchrotron 800 Blackburn Road Clayton VIC 3168
Board: AM-22
Poster Advanced Materials Poster Session 2


Hyung-Been Kang (The University of Auckland)


The phase transition of CuSb2O6 has been described previously as a transition from tetragonal trirutile to distorted monoclinic trirutile structure. Cu2+ as a d9 system forms the square lattice oxide layer, which leads to a second order phase transition (Jahn-Teller distortion) [1]. The systematic reduction in symmetry would require the existence of an orthorhombic modification between the two modifications, surpressed in many structures. From synchrotron high temperature measurements, the phase transition in CuSb2O6 can be clearly observed and a possible two modification model (orthorhombic modification (Pnnm) and tetragonal modification (P42/mnm)) can be refined from 200 °C to 900°C data. The direct phase transition from the monoclinic to the tetragonal modification is clearly surpressed over a large temperature range. The measurements show an unusual thermal behaviour. Some groups of diffraction peaks show an increase of the intensity as the temperature increases and others show a relative decrease of the intensity, but the thermal broadening decreases as the temperature increases. This is related to the ratio of the two high temperature modifications present at all temperature. The refined ratio of orthorhombic modification to tetragonal modification decreases from 200°C to 900°C but the phase transition is still not completed at 900°C. The refined lattice parameters indicate a normal thermal expansion of the unit cell, whereas the thermal broadening of the diffraction shows the opposite trend. [1] A.V. Prokofiev, F. Ritter, W. Assmus, B.J. Gibson and R.K. Kremer, J. Cryst. Growth. 247, 457 (2003).
Keywords Phase Transition, High Temperature, Solid State Chemistry, Synchrotron Powder Diffraction

Primary author

Hyung-Been Kang (The University of Auckland)


Prof. Chris Ling (University of Sydney) Dr Maxim Avdeev (ANSTO) Dr Qinfen Gu (Australian Synchrotron) Dr Ross Piltz (ANSTO) Dr Tilo Soehnel (The University of Auckland) Dr Trevor Finlayson (University of Melbourne)

Presentation Materials

There are no materials yet.
Your browser is out of date!

Update your browser to view this website correctly. Update my browser now