Enhanced intrinsic permittivity and bulk response in Y2/3Cu3Ti4+O12 ceramics

Field-enhanced bulk conductivity and resistive-switching in Ca-doped BiFeO3 ceramics.

The bulk conductivity at room temperature of Ca-doped BiFeO3 ceramics is p-type and increases reversibly by up to 3 orders of magnitude under the influence of a small dc bias voltage in the range ∼3 to 20 V mm(-1). The effect occurs in both grain and grain boundary regions, is isotropic and does not involve creation of filamentary conduction pathways. It is proposed that, by means of capacitive...

NDE for Bulk Defects in Ceramics

A 50 MHz C-scan imaging system is used to find defects in ceramics. The imaging system consists of a microcomputer-controlled scanner for data acquisition and signal conditioning. Synthetic aperture imaging at 50 MHz is carried out to obtain 3-D images of flaws. Image reconstruction is accomplished digitally on a minicomputer. A square synthetic aperture is used to image flaws in flat disc samp...

Intrinsic optical properties and enhanced plasmonic response of epitaxial silver.

Using atomically smooth epitaxial silver films, new optical permittivity highlighting significant loss reduction in the visible frequency range is extracted. Largely enhanced propagation distances of surface plasmon polaritons are measured, confirming the low intrinsic loss in silver. The new permittivity is free of extrinsic spectral features associated with grain boundaries and localized plas...

Piezoelectricity in Lead-Zirconate-Titanate Ceramics – Extrinsic and Intrinsic Contributions

Unipolar memristive Switching in Bulk Negative Temperature Coefficient Thermosensitive Ceramics

A memristive phenomenon was observed in macroscopic bulk negative temperature coefficient nickel monoxide (NiO) ceramic material. Current-voltage characteristics of memristors, pinched hysteretic loops were systematically observed in the Ag/NiO/Ag cell. A thermistor-based model for materials with negative temperature coefficient was proposed to explain the mechanism of the experimental phenomen...