Stable cubic spinels in the Zn-Mn-O system in air |
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Authors: | J. Blasco,J. Garcí a |
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Affiliation: | Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Departamento de Física de la Materia Condensada, Pedro Cerbuna 12, 50009 Zaragoza, Spain |
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Abstract: | A part of the Zn-Mn-O phase diagram has been studied by using soft synthetic conditions and highly reactive precursors. This procedure allowed us to find and to isolate new single phases in the Zn-rich region. The new compounds are cubic spinels with a nominal composition Mn3−xZnxO4 with x=1.6 and 1.7. These spinels decompose upon heating giving rise to tetragonal distorted spinels. This survey is focused on the low-temperature region (T?700 °C) completing previous reports on the Zn-Mn-O phase diagram.We also report the magnetic properties of the new cubic spinels. These samples behave as paramagnets obeying a Curie-Weiss law in a broad temperature range. The effective paramagnetic moment agrees with the nominal mixture of Mn3+ and Mn4+ ions. However, randomness and competitive interactions give rise to the formation of spin-glass phases at very low temperature. |
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Keywords: | 61.10.Nz 81.30.Dz 75.50.Pp 75.50.Lk 75.50.Tt |
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