Elsevier

Chemical Physics Letters

Volume 95, Issue 2, 25 February 1983, Pages 163-166
Chemical Physics Letters

The effect of low pressure on a high-spin—low-spin transition

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Abstract

The effect of low pressure (p = 150 bar) on the high-spin (HS)—low-spin (LS) transition in [FexZn1−x(2-pic)3]Cl2 · EtOH (x = 0.5, 1.0) was measured by Mössbauer spectroscopy and the results compared with theory. The linear dependence of the volume of the lattice on the HS fraction, which is the basic assumption of the theory, was proven by temperature dependent X-ray measurements.

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    High-pressure spectroscopic studies of Drickamer and colleagues and Ferraro and colleagues [2–20] in the 1960–1970 have already addressed the SCO phenomenon using Mössbauer, ultraviolet–visible (UV–vis) and infrared (IR) spectroscopies associated with either piston–cylinder or anvil-type pressure cells. High-pressure investigations (primarily using Mössbauer spectroscopic detection) were then taken up in the 1980s by various study groups [21–41]. There was a renaissance of interest in the effect of pressure on SCO compounds during the 1990s [42–77], involving studies using either clamp-type and helium gas cells coupled with magnetic susceptibility [26] and optical [49,60] detection methods or diamond anvil cells (DACs) in conjunction with X-ray spectroscopic [61,64,66,70] or X-ray diffraction (XRD) [68,78] techniques.

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In partial fulfilment of the Ph.D. thesis.

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