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Modulation mechanism and disorder structure in hollandite-type crystals (1991)

Wu, X. J. ; Fujiki, Y. ; Ishigame, M. ; [et al.]

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 47 (1991), S. 405-413

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ISSN: 1600-5724

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: The structural modulation in some hollandite-type crystals is explained by a vacancy-displacive modulation model. In this model the large cations located in the tetragonal channels along the c axis deviate from the average position to form a modulation wave. Three types of disorder in the initial phase of the modulation wave have been introduced to interpret apparently different diffraction patterns in hollandite-type crystals. A mathematical analysis as well as optical diffraction give results similar to those experimentally observed. High-resolution transmission electron microscope images have been observed to confirm the discussion further.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0108767391001435

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