Title

Investigating the Thermodynamic and Magnetic Properties of the Systems Ca3Co2- xMnxO6 and Ca3Co2-yZnyO6

Document Type

Oral Presentation

Campus where you would like to present

Ellensburg

Event Website

https://digitalcommons.cwu.edu/source

Start Date

15-5-2019

End Date

15-5-2019

Abstract

The compound Ca3Co2O6 is known to exhibit an exotic one-dimensional magnetic structure at low temperature. Relatively isolated ferromagnetic chains of cobalt ions, separated by calcium ions, interact weakly with neighboring chains, producing this quasi-one-dimensional magnetic structure. In an effort to study this magnetic state, we investigated the effect of chemical substitution of manganese and zinc for cobalt. Samples were synthesized via solid state reaction and phase purity was verified via x-ray diffraction. X-ray diffraction also elucidated a solubility limit in Ca3Co2-yZnyO6. Heat capacity and magnetization versus temperature were measured for the resulting samples using a Physical Properties Measurement System. A transition from a ferromagnetic to an antiferromagnetic structure is observed in Ca3Co2-xMnxO6 somewhere between x = 0.5 and 0.7. A miscibility gap prevents us from preparing single-phase samples in this region and determining the exact manganese concentration where the magnetic structure change occurs. Zinc substitution weakens the interactions that give rise to ferromagnetic order as expected since zinc does not have a magnetic moment. Magnetization was also measured versus magnetic field in the magnetically-ordered state, revealing field-induced phase transitions into other magnetic structures. Measurements of heat capacity and magnetization as functions of temperature were used to construct a temperature vs. zinc concentration phase diagram for Ca3Co2-yZnyO6 and to update a similar phase diagram for Ca3Co2-xMnxO6.

Faculty Mentor(s)

Benjamin White

Department/Program

Chemistry

Mantilla, Alexander - SOURCE Presentation 2.7.pptx (6295 kB)
Slides for SOURCE 2019 presentation Mantilla

Additional Files

Mantilla, Alexander - SOURCE Presentation 2.7.pptx (6295 kB)
Slides for SOURCE 2019 presentation Mantilla

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May 15th, 12:00 AM May 15th, 12:00 AM

Investigating the Thermodynamic and Magnetic Properties of the Systems Ca3Co2- xMnxO6 and Ca3Co2-yZnyO6

Ellensburg

The compound Ca3Co2O6 is known to exhibit an exotic one-dimensional magnetic structure at low temperature. Relatively isolated ferromagnetic chains of cobalt ions, separated by calcium ions, interact weakly with neighboring chains, producing this quasi-one-dimensional magnetic structure. In an effort to study this magnetic state, we investigated the effect of chemical substitution of manganese and zinc for cobalt. Samples were synthesized via solid state reaction and phase purity was verified via x-ray diffraction. X-ray diffraction also elucidated a solubility limit in Ca3Co2-yZnyO6. Heat capacity and magnetization versus temperature were measured for the resulting samples using a Physical Properties Measurement System. A transition from a ferromagnetic to an antiferromagnetic structure is observed in Ca3Co2-xMnxO6 somewhere between x = 0.5 and 0.7. A miscibility gap prevents us from preparing single-phase samples in this region and determining the exact manganese concentration where the magnetic structure change occurs. Zinc substitution weakens the interactions that give rise to ferromagnetic order as expected since zinc does not have a magnetic moment. Magnetization was also measured versus magnetic field in the magnetically-ordered state, revealing field-induced phase transitions into other magnetic structures. Measurements of heat capacity and magnetization as functions of temperature were used to construct a temperature vs. zinc concentration phase diagram for Ca3Co2-yZnyO6 and to update a similar phase diagram for Ca3Co2-xMnxO6.

https://digitalcommons.cwu.edu/source/2019/Oralpres/80