Dielectric ceramic, methods for making and evaluating the same, and monolithic ceramic electronic component
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United States of America Patent
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Apr 29, 2003
Grant Date -
Feb 27, 2003
app pub date -
Mar 7, 2002
filing date -
Mar 19, 2001
priority date (Note) -
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Abstract
A dielectric ceramic has a ceramic structure of crystal grains and grain boundaries between the crystal grains. The crystal grains are of a main component represented by the formula ABO.sub.3 and an additive containing a rare earth element wherein A is at least one of barium, calcium, and strontium, barium being an essential element, and B is at least one of titanium, zirconium, and hafnium, titanium being an essential element. The average rare earth element concentration in the interior of the crystal grains is about 50% or less the average rare earth element concentration at the grain boundaries. Furthermore, about 20% to 70% of the crystal grains have a rare earth element concentration in the center of the crystal grain of at least about 1/50 the maximum rare earth element concentration in a region extending inward from the surface by a distance corresponding to about 5% of the diameter of the crystal grain.
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