Preparation, crystal structure, dielectric properties, and magnetic behavior of Ba2Fe2Ti4O13

T. A. Vanderah, Q. Huang, W. Wong-Ng, B. C. Chakoumakos, J. Baker-Jarvis, R. S. Roth, A. Santoro

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6 Scopus citations

Abstract

The preparation, crystal structure, dielectric properties, and magnetic behavior of the new compound Ba2Fe2Ti4O13 are reported. Structural studies carried out by single-crystal X-ray diffraction and neutron powder diffraction show that this phase is isostructural with K2Ti6O13 and Ba2ZnTi5O13 (C2/m (No. 12); a = 15.216(1), b = 3.8979(3), c = 9.1350(6) Å, β = 98.460(7)°; V = 535.90(8) Å3; Z = 2). The cations Fe3+ and Ti4+ are partially ordered among distorted octahedral sites with Ba2+ occupying eleven-coordinated polyhedra. Ba2Fe2Ti4O13 exhibits TE0 resonance near 10 GHz with a dielectric constant of ∼28 and a dielectric loss tangent of 2 × 10-3. The compound displays complex paramagnetic behavior with marked field dependence; the magnetization at 80 kA/m is several orders of magnitude smaller than that of most ferrites. Spin-glass effects have not been observed; however, weak collective interactions are clearly present. No magnetic ordering has been detected by neutron diffraction down to 13 K.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalJournal of Solid State Chemistry
Volume120
Issue number1
DOIs
StatePublished - Nov 15 1995

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