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Pressure-Induced Spin-Crossover Features at Variable Temperature Revealed by In Situ Synchrotron Powder X-ray
Elodie Tailleur1, Mathieu Marchivie1, Jean-Paul Itié2
1CNRS, Univ. Bordeaux, ICMCB, UMR 5026, 87 avenue du Dr A. Schweitzer, 33608, Pessac, France.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 18, 2018
Summary
This study reveals unprecedented details about spin-crossover (SCO) complexes under high pressure. Increasing temperature affects SCO transition pressure, abruptness, and bulk moduli, offering new insights into material behavior.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Spin-crossover (SCO) complexes exhibit distinct high-spin and low-spin states.
- Understanding the structural changes accompanying SCO is crucial for material applications.
Purpose of the Study:
- To deconvolve structural features of high-spin and low-spin phases in an SCO complex.
- To investigate the pressure and temperature dependence of SCO phenomena.
Main Methods:
- High-pressure X-ray diffraction on a powder sample of [Fe(PM-PeA)2(NCSe)2].
- Variable temperature and pressure measurements.
Main Results:
- Independent analysis of structural parameters for high-spin and low-spin phases.
- Pressure-induced SCO observed at 0.16 GPa.
- Temperature dependence of transition pressure, SCO abruptness, and bulk moduli determined.
Conclusions:
- Bulk moduli show similar temperature dependence for both spin phases.
- Increasing temperature leads to a linear increase in SCO transition pressure.
- SCO abruptness significantly increases with temperature, suggesting potential piezo-hysteresis.
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