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Preparation ofα-MnO2with an Open Tunnel

✍ Scribed by Yuji Muraoka; Hiroshi Chiba; Toshiyuki Atou; Masae Kikuchi; Kenji Hiraga; Yasuhiko Syono; Shoko Sugiyama; Sadaaki Yamamoto; Jean-Claude Grenier

Book ID
102607984
Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
268 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

A single-phase -MnO 2 without any large stabilizing cations was successfully prepared by starting from hollandite-type (NH 4 ) x Mn 8 O 16 and quenching from 440°C during heating in flowing Ar. The unit-cell dimension was determined by XRD analysis to be a ‫؍‬ 10.308(2) A s and c ‫؍‬ 2.854(1) A s . In comparison with that of the starting material (a ‫؍‬ 9.896(1) A s and c ‫؍‬ 2.859(1) A s ), the a dimension increased while the c dimension changed little. No presence of ammonium ions in the structure of this specimen was shown by IR spectroscopy, the Kjeldahl analysis, or temperature-programmed-desorption (TPD) measurement. The structural change from the hollandite phase to Mn 2 O 3 was observed at 540°C. TPD analysis indicates the presence of nitrogen other than ammonium ions in the hollandite material we prepared, and also suggests that this nitrogen might have a strong chemical interaction to the hollandite structure. 1999 Academic Press

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two typographical errors were inadvertently introduced by the publisher: On page 96, left-hand column, line 10 should read &&the concentration of O was 135 mg/l'' instead of &&the concentration of O was 135 l3.'' On page 102, right-hand column, the journal name in Reference 9 should read &&Prog. Bat