Structural characterization of dense reduced BaTiO3 and Ba0.95La0.05TiO3 nanoceramics showing colossal dielectric values

Abstract

Solids, doi:10.1016Solids, doi:10. /j.jpcs.2010 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Quasi-intrinsic colossal permittivity in Nb and In co-doped rutile TiO2nanoceramics synthesized through a oxalate chemical-solution route combined with spark plasma sintering

“…6(b) shows the dielectric properties of the n-NITO sample as a function of temperature (250-450 K) at different frequencies. 10,12,39 This might imply either that n-NITO ceramics may have electrically homogeneous microstructures enabling the dismissal of a typical IBLC effect, or that dipoles related with any space charges, such as electrons, oxygen vacancies, and point defects for compensating extrinsic dopants, are highly localized at the atomic level. 6(b), it can be seen that the dielectric properties of n-NITO show excellent temperature stability over the relatively wide range of temperatures at measured frequencies.…”

Elastic excitations in BaTiO3single crystals and ceramics: Mobile domain boundaries and polar nanoregions observed by resonant ultrasonic spectroscopy

“…It became also clear that nanostructured BaTiO 3 shows colossal dielectric responses. 14 The interfacial effects, such as grain boundaries and twin boundaries, were then shown to depend strongly on the chemical compositions of the samples. 15 Finally, twinning remained visible for nanocrystals of sizes well below 100 nm 16 so that it is not possible to correlate the nanoscale behavior of BaTiO 3 simply with the intrinsic bulk behavior modified by the surfaces 17 because mobile twin boundaries persist to the smallest-known grain size and modify the macroscopic behavior of the sample significantly.…”

Continuous BaTi1−yZryO3 (0≤y≤1) nanocrystals synthesis in supercritical fluids for nanostructured lead-free ferroelectric ceramics

“…The sintering temperature was set at 1200°C (heating rate of 100°C·min −1 ) for 3 min applying a uniaxial pressure of 90 MPa. Prior to any characterization, the ceramics were annealed 10 h at 1000°C to avoid detrimental conductivity arising from Ti 4+ reduction into Ti 3+ during the SPS step performed under low oxygen partial pressure [38][39][40][41][42].…”