Potassium niobate
 | |
| Names | |
|---|---|
| IUPAC name
Potassium niobate | |
| Other names
niobate, niobium potassium oxide, potassium columbate | |
| Identifiers | |
| 12030-85-2 | |
| ECHA InfoCard | 100.031.573 |
| Properties | |
| KNbO3 | |
| Molar mass | 180.003 g·mol−1 |
| Appearance | White rhombohedral crystals |
| Density | 4.640 g/cm3 |
| Hazards | |
| Lethal dose or concentration (LD, LC): | |
| LD50 (median dose) |
3000 mg/kg (oral, rat) |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Potassium niobate (KNbO3) is a perovskite ferroelectric crystal. It has nonlinear optical coefficient properties, making it common in the manufacture of lasers.[1] Nanowires of potassium niobate have been used to produce tunable coherent light. The LD50 for potassium niobate is 3000 mg/kg (oral, rat).
Crystal Structure
On cooling from high temperature, KNbO3 undergoes a series of structural phase transitions. At 435 °C, the crystal symmetry changes from cubic centrosymmetric (Pm3 ̅m) 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).
Use in research
Potassium niobate has been found useful in many different areas of materials science research,[2] including properties of lasers,[3] quantum teleportation,[4] and it has been used to study the optical properties of particulate composite materials.[5]
In addition to research in electronic memory storage,[2] potassium niobate is used in resonant doubling, a technique developed at the IBM Almaden Research Center.[3] 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.
References
- ↑ Palik, Edward D. (1998). Handbook of Optical Constants of Solids 3. Academic Press. p. 821. ISBN 978-0-12-544423-1. Retrieved 13 December 2012.
- 1 2 "In Science Fields". The Science News-Letter. 62 (17): 264–265. 1952-10-25. doi:10.2307/3931381. JSTOR 3931381. – via JSTOR (subscription required)
- 1 2 Regalado, Antonio (1995-03-31). "Blue-Light Special". Science. New Series. 267 (5206): 1920. doi:10.1126/science.267.5206.1920. JSTOR 2886437. – via JSTOR (subscription required)
- ↑ Furusawa, A.; J. L. Sørensen; S. L. Braunstein; C. A. Fuchs; H. J. Kimble; E. S. Polzik (1998-10-23). "Unconditional Quantum Teleportation". Science. New Series. 282 (5389): 706–709. doi:10.1126/science.282.5389.706. JSTOR 2899257. – via JSTOR (subscription required)
- ↑ Lakhtakia, Akhlesh; Tom G. Mackay (2007-02-08). "Electrical Control of the Linear Optical Properties of Particulate Composite Materials". Proceedings: Mathematical, Physical and Engineering Sciences. 463 (2078): 583–592. doi:10.1098/rspa.2006.1783. JSTOR 20209136. – via JSTOR (subscription required)