Abstract
BaTi4O9 powder prepared by calcining BaCO3 and TiO2 powders was sintered to over 97% of theoretical density. Less than 5% Ba2Ti9O20 occurred as a second phase in “pure” BaTi4O9, and Al2O3 impurities from processing formed isolated hollandite (∼BaAl2Ti6O16) grains, which were identified by fringes in bright‐field TEM images. For pure BaTi4O9 at 1 MHz, a dielectric loss (tan δ) of 5 × 10−4 and dielectric constant of 39 were recorded. Hollandite impurities were found to increase tan δ by 2 orders of magnitude, whereas firing in oxygen decreased tan δ by an order of magnitude.
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