Mixed Anion Effect in a Cobalt Chromite Spinel Family
Disciplines
Inorganic Chemistry | Materials Chemistry | Other Chemistry | Physical Chemistry
Abstract (300 words maximum)
Spaniels, with the formula AM2X4 are a large family of materials that feature the pyrochlore lattice on the magnetic M site. Recent research has focused on investigating the magnetocaloric candidates within the chromite and ferrite spinel families. Selenide spinels contain a largest X2- anion, exhibiting competing antiferromagnetic and ferromagnetic orders due to stronger FM Cr-X-Cr super-exchange interactions the increasing lattice contains of the larger X2- anions making this effect more pronounced in selenides, while weaker in oxides. This allows us to explore a unique avenue to generate a large magnetocaloric effect (MCE) through the use of highly frustrated magnetic materials where the ground states are infinitely degenerate and the spins are field polarized under an applied magnetic field, resulting in a large magnetic entropy change. In this talk I will present the structural analysis and magnetic behavior of the mixed anion spinel materials CoCr2S4-xSex. These results provide insights into the effect of the magnetic behavior on the MCE in this chromite spinel family, and subsequently how the MCE can be further tailored through magnetic frustration.
Use of AI Disclaimer
no
Academic department under which the project should be listed
CSM – Chemistry and Biochemistry
Primary Investigator (PI) Name
Madalynn Marshall
Mixed Anion Effect in a Cobalt Chromite Spinel Family
Spaniels, with the formula AM2X4 are a large family of materials that feature the pyrochlore lattice on the magnetic M site. Recent research has focused on investigating the magnetocaloric candidates within the chromite and ferrite spinel families. Selenide spinels contain a largest X2- anion, exhibiting competing antiferromagnetic and ferromagnetic orders due to stronger FM Cr-X-Cr super-exchange interactions the increasing lattice contains of the larger X2- anions making this effect more pronounced in selenides, while weaker in oxides. This allows us to explore a unique avenue to generate a large magnetocaloric effect (MCE) through the use of highly frustrated magnetic materials where the ground states are infinitely degenerate and the spins are field polarized under an applied magnetic field, resulting in a large magnetic entropy change. In this talk I will present the structural analysis and magnetic behavior of the mixed anion spinel materials CoCr2S4-xSex. These results provide insights into the effect of the magnetic behavior on the MCE in this chromite spinel family, and subsequently how the MCE can be further tailored through magnetic frustration.