Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3490637
Keywords
antiphase boundaries; lattice constants; magnesium compounds; modulation; neodymium compounds; pattern formation; sodium compounds; stoichiometry; tungsten compounds
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357.]
- National Science Foundation [DMR0704255]
- MRSEC [DMR05-20020]
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Data is presented for a complex structural and compositional modulation in the perovskite (NaNd)(MgW)O-6. This modulation creates a large 14a(p)x14a(p)x2a(p) supercell (a(p)approximate to 3.9 angstrom is the lattice parameter of the cubic perovskite aristotype) containing ordered regions with doubled (110) d-spacings in the a-b plane separated by two-dimensional periodic antiphase boundaries and accompanied by a nanocheckerboard pattern. Faint periodic modulations in Z-contrast images suggest an associated periodic variation in composition. The presence of a sodium rich impurity implies the composition of the stable perovskite is nonstoichiometric. (C) 2010 American Institute of Physics. [doi:10.1063/1.3490637]
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