Journal
JOURNAL OF ELECTROCERAMICS
Volume 23, Issue 1, Pages 19-24Publisher
SPRINGER
DOI: 10.1007/s10832-008-9514-2
Keywords
TB; Dielectric relaxor; Disorder; Ceramics
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The replacement of sodium and niobium by lanthanum and iron in Pb(2)NaNb(5)O(15), have allowed to prepare the new solid state solution Pb(2)Na(1-x) La (x) Nb(5-x) Fe (x) 0(15) (0 a parts per thousand currency signaEuro parts per thousand x a parts per thousand currency signaEuro parts per thousand 1), crystallising with the tungsten bronze structure. The latter synthesized, in air, by solid state reaction, has been studied by means of X-ray and dielectric measurements. The composition dependencies of ferroelectric-paraelectric transition temperature and the lattice parameters are reported. The dielectric constants E >'(r) and E > aEuro(r)(3) have been also investigated as a function of temperature in the range 20A degrees aEuro700A degrees C, and as a function of frequency in the range 1 k-13 MHz. In the composition range 0 a parts per thousand currency signaEuro parts per thousand x a parts per thousand currency signaEuro parts per thousand 0.35, the materials exhibit a typical ferroelectric-paraelectric transition while, in the composition range 0.35 < x a parts per thousand currency signaEuro parts per thousand 1, a relaxor effect has been evidenced.
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