Electron microscopy and diffraction study of modulated structures in La1-xThxNbO4+=12x and LaNb1-xWxO4+=12x
β Scribed by A. Olsen; R.S. Roth
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 99 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0304-3991
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π SIMILAR VOLUMES
Single-phase perovskite-type reduced tantalates, Na 1 Ψ x Sr x TaO 3 with 0 < x40.4, have been synthesized by heating mixtures of NaTaO 3 , Sr 5 Ta 4 O 15 and Ta in sealed tantalum ampules at 14003C for 20+24 h. At Sr contents of 0.54x40.8 and above 14003C, polyphasic samples were obtained. X-ray po
The solid solutions Bi 2Ψx Sr 2Ψx Ti 1Ψx Nb 2Ψx O 12 (0 < x < 0.6). ( 1) and Bi 4Ψx La x Ti 3 O 12 (x β«Ψβ¬ 1 and 2) (2) have been analyzed in detail by a combination of powder X-ray and neutron di4raction. Both solid solutions adopt a tetragonal variant of the archetypal three-layer Aurivillius phase