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Structural and dielectric properties of ZrO2 added (Na1/2Bi1/2)TiO3 ceramic
Kumari,K.; Prasad,K.; Yadav,K.L.; Sen,S.Polycrystalline samples of ZrO2 added (Na1/2Bi1/2)TiO3 were prepared using high-temperature solid-state reaction method at 1050ºC and subsequent sintering at 1090ºC in air atmosphere. Rietveld analyses of XRD data indicated the formation of a single-phase hexagonal structure with R3c symmetry. Dielectric studies revealed the relaxor behaviour. The addition of ZrO2 to (Na1/2Bi1/2)TiO3 shifted phase transition te...
Bio and magnetostratigraphy of two Lower Miocene sections, Tagus basin (Portugal)
Sen, S.; Antunes, M. T.; Pais, João; Legoinha, P.The magnetostratigraphy of two sections in early Miocene marine deposits of the Tagus Basin is studied. Thermal demagnetization was used to isolate the primary component of magnetization for 45 samples from the Foz da Fonte section, and for 74 others from Trafaria section. The succession of the polarity zones found in these sections is tentatively correlated with the geomagnetic polarity time scale (GPTS) on th...
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