On polymorphism and morphotropism of rare earth sesquioxides

@article{Fedorov2002OnPA,
  title={On polymorphism and morphotropism of rare earth sesquioxides},
  author={Pavel P. Fedorov and Mikhail V. Nazarkin and R. M. Zakalyukin},
  journal={Crystallography Reports},
  year={2002},
  volume={47},
  pages={281-286}
}
The data on the phase transitions in the series of rare earth sesquioxides are considered in terms of the thermodynamic theory of morphotropism. It is shown that the scheme of polymorphism and morphotropism suggested by V.V. Glushkova is the most adequate. The derivatographic dehydration of lanthanum and neodymium oxide hydrates is performed. The transition of the cubic C modification into the hexagonal A modification of neodymium oxide is accompanied by the removal of volatile impurities and… 
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References

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Under equilibrium conditions the polymorphic forms of the rare earth sesquioxides transform reversibly from onen form to the other. The sesquioxides of the largest ions, La, Ce, and Pr, exhibit the
Crystallographic shear relations between the structure types α‐UO3, CaF2, La2O3 and NaCl and a correlation of some lanthanide and actinide oxide structures
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When the α-UO3, La2O3 and NaCl structure types are idealized by a topological distortion involving only an extension or contraction of the hexagonal c axis (cubic [111]) it is clear that they are
Beiträge zur Polymorphie der Sesquioxide der Seltenen Erden
An den Sesquioxiden von Samarium, Europium und Gadolinium wird die Umwandlung von Modifikation C in Modifikation B untersucht. Die Minimaltemperatur fur den Umwandlungsbeginn und die Geschwindigkeit
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