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The role of porosity on the low and high field dielectric properties was studied in Ba0.70Sr0.30TiO3 ceramics with various porosity levels obtained by using lamellar graphite as sacrificial template. The permittivity decreases with increasing porosity, from around ε∼7690 (dense ceramic) down to 380 (ceramic with 29% porosity), while preserving the Curie temperature at about 35°C. The effective permittivity...
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