Thermal Expansion of Alkaline‐Doped Lanthanum Ferrite Near the Néel Temperature |
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| Authors: | Geoffrey L Beausoleil II Patrick Price David Thomsen Alex Punnoose Rick Ubic Scott Misture Darryl P Butt |
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| Affiliation: | 1. Department of Materials Science & Engineering, Boise State University, , Boise, Idaho, 83725;2. Department of Physics, Boise State University, , Boise, Idaho, 83725;3. Center for Advanced Energy Studies, , Idaho Falls, Idaho, 83401;4. Kazuo Inamori School of Engineering, Alfred University, , Alfred, New York, 14802 |
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| Abstract: | The thermal expansion and magnetic behaviors of divalent, alkaline‐doped lanthanum ferrites (La0.9M0.1FeO3, M=Ca, Sr, Ba) were assessed using a combination of dilatometry, magnetometry, time‐of‐flight neutron diffraction, and high‐temperature X‐ray diffraction. Néel temperatures were determined through vibrating sample magnetometry and correlated well with changes in thermal expansion behavior observed during both dilatometry and X‐ray diffraction. The Néel temperatures observed for pure, Ca‐doped, Sr‐doped, and Ba‐doped lanthanum ferrites were 471°C, 351°C, 465°C, and 466°C, respectively. The effect of divalent substitutions on the magnetic behavior are attributed to charge compensation mechanisms and structural changes in the material. |
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