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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 53  1994
Niobium-Doped Barium Titanate -A Chemically Processed Material with High Dielectric Constant
B. K. GUHA AND B. N. SAMADDAR
Pages : 33-38
DOI :10.1080/0371750X.1994.10804627
Abstract
Various mol% of Nb20 5 were incorporated into BaTi03 during its preparati~n in the form of BaTiO(C20 4)z.4H20. For a critical concentration of 0.25 mol% Nb20 5, the dielectric constant of the material was· found to increase drastically to a value of 80,000 at room temperature at 1 KHz frequency. On adding 2 mol% excess Ti to the calcined powder, the dielectric constant reached a value of 6.5 x 105 • The Curie point of the critically doped samples was ll6°C, i.e. l2°C below that of undoped samples. No change in dielectric constant or Curie point compared to undoped samples was observed if the excess Ti was incorporated during precipitation. The high effe(·tive value of the dielectric constant is possibly indicative of a grain boundary harrier layer capacitive effect.
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