Acoustic emissions from spin crossover complexes

Acoustic emission from the compounds [Fe(HB(tz) 3 ) 2 ] and [Fe(Htrz)(trz) 2 ]BF 4 was detected during the thermally induced spin transition and is correlated with simultaneously recorded calorimetric signals. We ascribe this phenomenon to elastic waves produced by microstructural and volume changes...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2024-04, Vol.12 (16), p.5757-5765
Main Authors: Kamel, Sarah M, Daróczi, Lajos, Tóth, László Z, Beke, Dezs L, Juárez, Gerardo Gutiérrez, Cobo, Saioa, Salmon, Lionel, Molnár, Gábor, Bousseksou, Azzedine
Format: Article
Language:English
Subjects:
Acoustic emission
Chemical Sciences
Chemistry
Distribution functions
Elastic waves
Energy distribution
or physical chemistry
Probability distribution functions
Spin transition
Theoretical and
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Summary:Acoustic emission from the compounds [Fe(HB(tz) 3 ) 2 ] and [Fe(Htrz)(trz) 2 ]BF 4 was detected during the thermally induced spin transition and is correlated with simultaneously recorded calorimetric signals. We ascribe this phenomenon to elastic waves produced by microstructural and volume changes accompanying the spin transition. Despite the perfect reversibility of the spin state switching (seen by the calorimeter), the acoustic emission activity decreases for successive thermal cycles, revealing thus irreversible microstructural evolution of the samples. The acoustic emission signal amplitude and energy probability distribution functions followed power-law behavior and the characteristic exponents were found to be similar for the two samples both on heating and cooling, indicating the universal character, which is further substantiated by the well scaled average temporal shapes of the avalanches. Listening to the acoustic noise emitted by molecular spin crossover materials reveals both reversible and irreversible microstructural phenomena associated with the spin transition, providing a simple tool to detect structural fatigability.
ISSN:2050-7526
2050-7534
DOI:10.1039/d4tc00495g