Calcination - Dielectric properties of solids - Grain size and shape - Lead compounds - Niobium compounds - Scanning electron microscopy - Sintering - Thermal effects - X ray analysis;
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摘要:
Pyrochlore-free lead magnesium niobate ceramics produced by a modified two-stage calcination process are studied. One calcination step of the two-stage calcination process was omitted in this method. Without calcining, columbite MgNb2O6 and PbO were sintered directly to form pyrochlore-free and dense Pb(Mg1/3Nb2/3)O3 ceramics. The grain size is about 6 μm and the dielectric constant reaches 17000 at -9 °C under 1 kHz. An increase in sintering temperature resulted in an increase in maximum dielectric constant.
机构:
Alexandru Ioan Cuza Univ, Dept Solid State & Theoret Phys, Iasi 700506, RomaniaAlexandru Ioan Cuza Univ, Dept Solid State & Theoret Phys, Iasi 700506, Romania
Curecheriu, Lavinia P.
Ianculescu, Adelina
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Univ Politehn Bucuresti, Bucharest 011061, RomaniaAlexandru Ioan Cuza Univ, Dept Solid State & Theoret Phys, Iasi 700506, Romania