Lead iron tungstate capacitive transducer, relaxor material...

Details Lead iron tungstate capacitive transducer, relaxor material... Lead iron tungstate capacitive transducer, relaxor material...

2008-04-08

2008-04-08

Bos, Steven (Department: 1793)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S594900, C423S594130, C423S061000

Reexamination Certificate

active

10319601

ABSTRACT:
The present invention discloses a relaxor material lead iron tungstate which has been synthesized in doped and undoped conditions by single and two step heat treatment. The relaxor material is seen to exhibit almost negligible hysteresis and a transducer made thereby shows pressure measurement capability over a wide range from 0.5 MPa to 415 MPa with accuracy of ±0.05%.

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Kumar Y et al: “A capacitive pressure gauge as a reliable transfer pressure standard” Sensors and Actuators B, Elsevier Sequoia S. A., Lausanne, CH, vol. 55, No. 2-3, May 11, 1999, pp. 217-221, XP004363529 ISSN: 0925-4005.
Valarinho P M et al: “Effect of excess of iron oxide and lead oxide on the microstructure and dielectric properties of lead-iron tungstate ceramics” Journal of the European Ceramic Society, 1993, UK, vol. 11, No. 5, pp. 407-415, XP009002666 ISSN: 0955-2219.
Zhou L et al: “Synthesis and characterization of lead iron tungstate ceramics obtained by two preparation methods” Mater Res Bull; Materials Research Bulletin Nov. 1994, vol. 29, No. 11 Nov. 1994, pp. 1193-1201, XP009002667.
International Search Report for PCT/IN 02/00078 dated Jan. 2, 2003.

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