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Potassium niobate

Potassium niobate

Potassium bromate Strontium barium niobate

Potassium niobate (KNbO3) is an inorganic compound with the formula KNbO3. A colorless solid, it is classified as a perovskite ferroelectric material. It exhibits nonlinear optical properties, and is a component of some lasers. Nanowires of potassium niobate have been used to produce tunable coherent light.

Structure

On cooling from high temperature, KNbO3 undergoes a series of structural phase transitions. At 435 °C, the crystal symmetry changes from cubic centrosymmetric (Pmm) to tetragonal non-centrosymmetric (P4mm). On further cooling, at 225 °C the crystal symmetry changes from tetragonal (P4mm) to orthorhombic (Amm2) and at −50 °C from orthorhombic (Amm2) to rhombohedral (R3m).

Crystal structure of Potassium Niobate

Applications and research

In addition to research in electronic memory storage, potassium niobate is used in resonant doubling. This technique allows small infrared lasers to convert output into blue light, a critical technology for the production of blue lasers and technology dependent upon them.

Potassium niobate has been found useful in many different areas of materials science,{{Cite journal and it has been used to study the optical properties of particulate composite materials.{{Cite journal

Safety

The for potassium niobate is 3000 mg/kg (oral, rat).

References

References

  1. CRC Handbook, 90th Edition (03 Jun 2009) {{ISBN. 1-4200-9084-4, section 4: Physical Constants of Inorganic Compounds, page 83
  2. Hewat, A W. (1973-03-28). "Soft modes and the structure, spontaneous polarization and Curie constants of perovskite ferroelectrics: tetragonal potassium niobate". Journal of Physics C: Solid State Physics.
  3. Palik, Edward D.. (1998). "Handbook of Optical Constants of Solids 3". Academic Press.
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potassium-compounds niobates nonlinear-optical-materials ferroelectric-materials perovskites piezoelectric-materials
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