New Structural Results for the High-Pressure Phases of InSb

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Abstract
A system for angle-dispersive powder diffraction at high pressure has been developed at the UK synchrotron source, SRS Daresbury, based on an image-plate detector. With careful collimation and shielding, coupled with full pattern integration, the system yields powder profiles with very high signal-to-noise. These techniques have been used to re-examine the structural phase transitions in InSb up to 5GPa at room temperature. Two distinct sequences of transitions are observed, involving four different structures: the cubic zincblende phase (P1), a tetragonal phase (P2), and two orthorhombic phases (P3 and P4). Either P1 transforms through P2 and P3 to P4 in the pressure range just above 2GPa, or there is a direct transition from P1 to P4 at about 3GPa. P2 is previously unobserved at room temperature: it has the β-tin structure, but it is not the InSb-II phase. It appears not to be long-range ordered. P3 is the InSb-II phase, which is now shown to be orthorhombic and site ordered. P4 is the InSb-IV phase, but it is shown to have a much more complicated structure than previously supposed. P4 is also site ordered.

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