Synthesis, Structural Characterization, and Electrical Properties of New Oxygen-Deficient Tetragonal Tungsten Bronzes Ba2NdTi2+xNb3–xO15–x/2
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Altres documents de l'autoria: Prades Tena, Marta; Masó, Nahum; Beltrán Mir, Héctor; Cordoncillo, Eloisa; West, Anthony R.
Metadades
Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
comunitat-uji-handle4:
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http://dx.doi.org/10.1021/ic301156c |
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Títol
Synthesis, Structural Characterization, and Electrical Properties of New Oxygen-Deficient Tetragonal Tungsten Bronzes Ba2NdTi2+xNb3–xO15–x/2Data de publicació
2013Editor
American Chemical SocietyISSN
0020-1669; 1520-510XCita bibliogràfica
Inorg. Chem., 2013, 52 (4), pp 1729–1736Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/abs/10.1021/ic301156cParaules clau / Matèries
Resum
Oxygen-deficient tetragonal tungsten bronzes ceramics with general formula Ba2NdTi2+xNb3–xO15–x/2 (0 ≤ x ≤ 1) have been prepared by low temperature solvothermal synthesis with final firing of ceramics at 1100–1300 °C ... [+]
Oxygen-deficient tetragonal tungsten bronzes ceramics with general formula Ba2NdTi2+xNb3–xO15–x/2 (0 ≤ x ≤ 1) have been prepared by low temperature solvothermal synthesis with final firing of ceramics at 1100–1300 °C in air. Rietveld refinement of X-ray powder diffraction (XRD) and neutron powder diffraction (ND) data at room temperature of Ba2NdTi3Nb2O14.5 shows that Ba and Nd are ordered on the 15-coordinate and 12-coordinate sites, respectively, Ti and Nb are disordered nonrandomly over the two octahedral sites, and oxygen vacancies locate preferentially in the coordination sphere of Nd and Ti/Nb(2) atoms. Variable frequency impedance measurements show that samples are poor electronic conductors with activation energies 0.8–1.7 eV, conductivities 1 × 10–5 S cm–1 at 725 °C and with some evidence of oxide ion conduction at high x values. Composition dependence of the dielectric properties shows a transition from classic ferroelectric behavior with Ba2NdTi2Nb3O15 to a relaxor-like behavior with Ba2NdTi3Nb2O14.5. At intermediate compositions, both a first-order phase transition and relaxor-like behavior are observed. [-]
Publicat a
Inorganic Chemistry, 2013, vol. 52, no 4Drets d'accés
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