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Structural and Transport Properties of Mg1−xMnxMn2O4±δ Spinels

✍ Scribed by Lorenzo Malavasi; Paolo Ghigna; Gaetano Chiodelli; Giorgio Maggi; Giorgio Flor

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
180 KB
Volume
166
Category
Article
ISSN
0022-4596

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✦ Synopsis

The synthesis and structural properties of Mg 1؊x Mn 2؉x O 4 , for 04x41 are described. Complete miscibility in the solid state exists for this system. For the material with the correct stoichiometry, i.e. MgMn 2 O 4 , the e4ect of temperature on the cation distribution was investigated: above 6003C the inversion degree (m) starts increasing. The electrical conductivity shows a small dependence on P(O 2 ) which is consistent with the small oxygen non-stoichiometry determined by means of thermogravimetry. The main contribution to the transport properties arises from the inversion equilibrium. Two distinct conductivity regimes, below and above the inversion threshold, can be assumed to explain the electrical conductivity and thermoelectric power results.

2002 Elsevier Science (USA)

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