X-Ray Structural Determination of a Multilayered Magnetic Dielectric Ceramic Ba42Ti51Fe20O174 in the BaO–TiO2–Fe2O3 System
✍ Scribed by V.M. Nassif; R.E. Carbonio; J.L. Hodeau; E. Dooryhée
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 752 KB
- Volume
- 166
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Crystallographic studies and refinement of a native multilayered phase (Ba 42 Ti 51 Fe 20 O 174 ), occurring in the BaO-TiO 2 -Fe 2 O 3 system for a Ba:Ti:Fe composition close to 2:2:1, were undertaken using synchrotron X-ray powder diffraction. In this area of the BaO-TiO 2 -Fe 2 O 3 phase diagram, numerous ternary compounds were found for extremely close chemical and thermal conditions and multilayered phases were always prepared together with a few adjacent phases. The structure of the multilayered compound (Ba 42 Ti 51 Fe 20 O 174 : space group C2=m; a ¼ 9:9512ð2Þ ( A, b ¼ 17:2366ð4Þ ( A, c ¼ 42:5272ð2Þ ( A, a ¼ 901; b ¼ 94:4949ð5Þ1; c ¼ 901; V ¼ 7272:04 ( A 3 , q ¼ 5:62 g/cm 3 , Z ¼ 2) has been solved by Rietveld analysis of a multiphase pattern containing two other known phases (Ba 12 Ti 15 Fe 28 O 84 : space group C2=m; a ¼ 9:9792ð2Þ ( A, b ¼ 17:2883ð6Þ ( A, c ¼ 19:1714ð4Þ ( A, a ¼ 901; b ¼ 99:7253ð6Þ1; c ¼ 901; V ¼ 3260:04 (
A 3 , q ¼ 5:30 g/cm 3 , Z ¼ 2; and c-Ba-Ti 0.925 Fe 0.075 O 3 : space group Pm 3 3m; a ¼ 4:00779ð1Þ ( A, a ¼ b ¼ c ¼ 901; V ¼ 64:38 ( A 3 , q ¼ 6:04 g/cm 3 , Z ¼ 1). This multilayered structure adopts a 54-layer close-packed structure built with a (chcchhhhcchhhhcchc) 3 (Ba,O) stacking along the caxis to give rise to a very long (c rh ¼ 127:19 ( A) rhombohedral caxis. Octahedral sites are occupied by a mixture of Ti 4+ and Fe 3+ cations and tetrahedral ones by Fe 3+ cations. # 2002 Elsevier Science (USA)