Abstract
FeBO3 and Fe3BO6 are antiferromagnets with TN ≈ 348 K and 508 K respectively. This work presents the results of the study of the thermal expansion and phase transitions occurring in these borates by hightemperature X-ray powder diffraction and Mossbauer spectroscopy in a wide temperature range. Unit cell parameters are refined by the Rietveld method at different temperatures. For both compounds an abrupt change in thermal expansion coefficients α is revealed near the magnetic antiferromagnet–paramagnet phase transition.
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