Abstract
Sr 2MgTeO 6 powders and pellets were prepared by a solid-state ceramic route. The structure and microstructure were investigated using x-ray diffraction, transmission electron microscopy, and scanning electron microscopy methods. A structural inconsistency was discovered between the pseudocubic tetragonal structure (I4/m) and the pseudotetragonal monoclinic P2 1/n structure of Ca 2MgTeO 6, both of which have previously been reported. Rather than undergoing an antiphase-to-in-phase tilt transition along the long axis, a more probable untilted-to-in-phase tilt transition was found, lowering the symmetry of Sr 2MgTeO 6 to monoclinic, I2/m. Additionally, slight breaks in the fourfold symmetry expected in the <001> (tetragonal) orientations observed in electron diffraction patterns support the lowering of symmetry.
Original language | English |
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Pages (from-to) | 49-56 |
Number of pages | 8 |
Journal | Journal of the Australian Ceramic Society |
Volume | 47 |
Issue number | 2 |
State | Published - 2011 |
Keywords
- Electroceramics
- Electron microscopy
- Perovskite