Structural studies of ordering in the (Pb{sub 1{minus}x}Ba{sub x})(Mg{sub 1/3}Nb{sub 2/3})O{sub 3} crystalline solution series
Journal Article
·
· Journal of the American Ceramic Society
- Univ. of Illinois, Urbana, IL (United States)
The ordered structures of the (Pb{sub 1{minus}x}Ba{sub x})(Mg{sub 1/3}Nb{sub 2/3})O{sub 3} crystalline solution series were investigated by selected area electron diffraction (SAED) and high-resolution electron microscopy (HREM). At low Ba contents (e.g., x < 0.40), the ordered structure was found to be isostructural with Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}, with a doubled unit cell characterized by {1/2}{l_brace}111{r_brace} superlattice reflections. At higher Ba contents (e.g., x > 0.60), the ordered structure was characterized by 1/3{l_brace}111{r_brace} superlattice reflections. For intermediate Ba contents (e.g., x = 0.60), diffuse scattering along the {l_brace}111{r_brace} between diffuse {1/2}{l_brace}111{r_brace} and 1/3{l_brace}111{r_brace} reflections was observed. The ordering is attributed to the distribution of the B-site cations between multiple sublattices. Strong fluctuations in the B-site cation ratio between ordered and disordered regions are believed not to exist; however, the possibility of weak fluctuations is consistent with the observed lattice images.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-91ER45439
- OSTI ID:
- 116099
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 78; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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