Patent · US Expired

Gas discharge lamp having ferroelectric ceramic electrodes

US6417621B1 · kind B1 · utility

0Cited by

3References

4Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Detlev Hennings · Aachen, DE
Oliver Steigelmann · Aachen, DE

Key dates

Filing date	Apr 7, 2000
Grant date	Jul 9, 2002
Priority date	—
Expiry date	Apr 7, 2020

Classification

Technology area (CPC H)Electricity
CPC primaryH01J2261/02
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A gas discharge lamp has electrodes of Ba(Ti1−xZrx)O3 with donor/acceptor dopants. Specific donor/acceptor combinations, an optimized content of zirconium and an optimized atomic ratio between the cations leads to ferroelectric ceramic exhibiting high values of the remnant polarization Pr and the dielectric constant &ggr;r, as well as rectangular hysteresis loop and low coercive field strengths Ec. When an alternating voltage is applied to the ferroelectric electrodes, the non-linear properties of the electrodes bring about the ignition of the lamp as well as the continuous operation thereof.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.