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In situ Transmission Electron Microscopy Observation of Multiple Phase Transition in BaGd 2 Mn 2 O 7
Author(s) -
Nakano Hiromi,
Ishizawa Nobuo,
Kamegashira Naoki,
Yashima Masatomo
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01314.x
Subject(s) - tetragonal crystal system , monoclinic crystal system , transmission electron microscopy , orthorhombic crystal system , phase transition , crystallography , phase (matter) , materials science , analytical chemistry (journal) , chemistry , condensed matter physics , crystal structure , nanotechnology , physics , organic chemistry , chromatography
In situ transmission electron microscopy observation revealed that BaGd 2 Mn 2 O 7 undergoes several phase transitions upon heating. The orthorhombic Pnnm phase (I) at room temperature was transformed into a tetragonal P 4 2 / mnm (II) at around 420 K via an intermediate phase. On further heating, the other phase (III) nucleated in the phase II matrix at 623 K and grew until covering the whole inspected region by 723 K. Phase III has a 1.5% lattice mismatch along c compared with phase II, and presumably has a monoclinic symmetry. The transition between II and III was of the first order.
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