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Preparation of Ba2Ti9O20 from oxalates

M. CERNEA1,*

Affiliation

  1. National Institute for Materials Physics, PO BOX MG-7, Bucharest, RO-77125, Romania

Abstract

A barium titanate precursor with barium: titanium ratio of 2: 9 was prepared by coprecipitation of mixed barium and titanium chlorides with ammonium oxalate aqueous solution at pH 7-7.5. Single-phase of Ba2Ti9O20 crystallised in the triclinic system and dense ceramic are obtained by sintering at 1375 °C for 4-8.5 h. The grain size of the sintered ceramics is 3 to 5 μm. Dielectric properties of the sintered ceramics in the microwave frequency region were measured using the TE011 mode. Good microwave characteristics for Ba2Ti9O20 were found. At 5 GHz, the dielectric constant and the dielectric loss (tgδ) were 36 respectively, 0.6x10-3. The quality factor due to dielectric loss at 5 GHz was ~ 1 700..

Keywords

Ba2Ti9O20, coprecipitation, microwave dielectric properties.

Submitted at: April 2, 2007
Accepted at: July 15, 2007

Citation

M. CERNEA, Preparation of Ba2Ti9O20 from oxalates, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 7, pp. 2258-2261 (2007)