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structure of type kalium-tungsten6po ι∣ 3i> ι

One of the most widespread types oxygen-oktaedrnyh structures of a ferroelectric material, after structure perovskita, javlja¾tsjastruktura type of tungsten bronze. Such linkings are spread not only for the tungsten, all these structures have an oxygen deficit.

Their blanket formula looks like AsBkO χ. The sizes of an ion And and value h spot symmetry of a crystal which can concern to cubic, hexagonal, tetragonal, or monoclinic singonii [18 21J.

The majority known segnetoellektrikov, with structure of type of tungsten bronze otnosjatsja to tetragonal singonii [18-21]. All of them javljajutsja the firm solutions, at least two builder. Their blanket formula (And 1) 2 (A2) 4C. ∣ B10O3 ∩ or (Al) 2 (A2) 4B10O30. For this structure integrating of oxygen octahedrons related by vertexes among themselves with difficulty, such is characteristic, that they form three types of open channels:
Pentagonal, square and triangular |21 24 |. Usually two of these types of channels contain cations А1 and А2, as pokazanno in drawing 1.4. Positions А1, А2 and With can be engaged in various cations. The position In more often is occupied with ions Nb3 "or Та3", which, as a rule, raspologajutsja in oxygen octahedrons. pololzhenie With can be engaged only in ions of small radius, therefore it is not occupied more often. The blanket formula niobatov with type structure tetroganalnyh tungsten bronz accordingly looks like (Al) 2 (A2) 4C4Nb1oO3о [24].

Fig. 1.4. A projection of structure of type teteragonalnoj tungsten bronze on an axis (001 [22].

1.3.

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A source: Lisitsyn Vladimir Sergeevich. PYROELECTRIC PROPERTIES And the STATE of POLARIZATION of MONOCRYSTALS of FIRM SOLUTIONS NIOBATA of BARIUM of STRONTIUM And NIOBATA CALCIUM BARIUM. The dissertation on competition of a scientific degree of the candidate of physical and mathematical sciences. Tver - 2015. 2015

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