caa a22 4500 388019387 CHVBK 20180307124919.0 cr unu---uuuuu 161130e199810 xx s 000 0 eng 10.1557/JMR.1998.0399 doi S0884291400046343 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0399 Crystallography and microstructural studies of phase transformations in the Dy2O3 system [Elektronische Daten] The crystallography, microstructures, and phase transformation mechanisms in dysprosia (Dy2O3) have been studied. The lattice parameters of B and C phases were refined by x-ray diffraction (XRD). The modulated structures and decomposed structures in the CaO-doped samples were characterized by transmission electron spectroscopy (TEM). A new twin was observed in the modulated B phase. Contrary to the previous studies, the B to C transformation was induced by grinding. The A to B transformation was considered to be ferroelastic and the spontaneous strain was calculated. The major driving force for the B (monoclinic) to C (cubic) transformation is suggested to be the release of lattice strains and cation charge repulsions in the B structure, which is analogous to the β (monoclinic) to γ (orthorhombic) transformation in Ca2SiO4. This transformation can be displacive, if some conditions are provided to overcome the bonding energy of the interlayer oxygens in the B structure. Copyright © Materials Research Society 1998 Kim Youn Joong Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 Kriven Waltraud M. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 Journal of Materials Research Cambridge University Press 13/10(1998-10), 2920-2931 0884-2914 13:10<2920 1998 13 JMR https://doi.org/10.1557/JMR.1998.0399 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0399 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Youn Joong Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 NATIONALLICENCE 700 1- Kriven Waltraud M. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/10(1998-10), 2920-2931 0884-2914 13:10<2920 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge