A New Type of Potassium Niobate Crystal: Utilizing the Potassium Sites (Preprint)

Abstract

Darker regions (perturbed Fe- FeNb near a AgK) in the crystal exhibit strong contra-directional-TBC. There is a similar affect for interchanging NiNb for FeNb and RbK for AgK. AuK should work as well, but there's no evidence yet. The presence of Ag changes the local environment, perturbing the other impurities (i.e. Oh-), and the phonon/Raman modes are strongly affected. Ag was then purposely used as a codopant KNbO3:Fe, Ag and is responsible for: An enhanced visible/OH- absorption. A stronger PV field. The strong affect on the Raman scatter. A possible increase in trap density (undetermined). Codoping with Ag is better than Rb in terms of speed, there's no significant difference in AOD. Singly doped Ag and unperturbed Fe are hole conducting, whereas perturbed Fe is electron conducting.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2006
Accession Number
ADA473932

Entities

People

  • Dean R. Evans

Organizations

  • Air Force Research Laboratory

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  • Air Platforms
  • Sensors

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  • Absorption
  • Absorption Spectra
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  • Electrons
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  • Piezoceramics
  • Potassium
  • Regions
  • Space Charge

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  • Physics

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  • Microelectronics