Articles | Volume 32, issue 3
Eur. J. Mineral., 32, 347–354, 2020
https://doi.org/10.5194/ejm-32-347-2020
Eur. J. Mineral., 32, 347–354, 2020
https://doi.org/10.5194/ejm-32-347-2020

Research article 08 Jun 2020

Research article | 08 Jun 2020

Tancaite-(Ce), ideally FeCe(MoO4)3 3H2O: description and average crystal structure

Elena Bonaccorsi and Paolo Orlandi

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Short summary
Molybdates are of a great interest due to their ionic conductivity, negative thermal expansion, and immobilization of radionuclides. The new mineral tancaite-(Ce), FeCe(MoO4)3•3H2O, shows a new structure type never observed in natural and synthetic molybdates. Its cubic average structure may be described as a derivative of the perovskite structure, in which Fe-centred octahedra are linked through MoO4 groups. The ordering of Mo and O atoms results in one or more complex superstructures.