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Synthesis and structure analysis of a new sodium iron titanate Na2+xFexTi4−xO9 with x=0.65 by Junji Akimoto; Yasuhiko Takahashi; Norihito Kijima; Yoshito Gotoh is a Materials Science article available to read on EtoBox.

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A new member of sodium iron titanate compounds, Na 2 + x Fe x Ti 4 À x O 9 with x = 0.65 has been synthesized by heating a mixture of Na 2 CO 3 , Fe 2 O 3 and TiO 2 at 1273 K in air. It crystallizes in the monoclinic system, space group C2/m with a = 23.057(3) A ̊, b = 2.945(3) A ̊, c = 10.684(3) A ̊, b = 103.54(2)j, and V = 705.3(8) A ̊3. The structure was determined using single-crystal X-ray intensity data and refined to the conventional values R = 4.8% and wR = 4.7% for 1730 independent reflections. The basic units of the structure are built up from single, double and triple rutile-type (Ti,Fe)O 6 chains along the b-axis. Three types of sodium sites are located in the large tunnel space with the site occupancy values of 1.00(1) for Na1, 0.78(1) for Na2, and 0.87(1) for Na3, respectively. The disordering and deficiency of Na2 site is well consistent with those observed in the isostructural compounds, Na 2.

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Author

Junji Akimoto; Yasuhiko Takahashi; Norihito Kijima; Yoshito Gotoh

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-2738)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)