NDLI: Ferroelectric and optical properties of Ba$_{5}$Li$_{2}$Ti$_{2}$Nb$_{8}$O$_{30}$ ceramics potential for memory applications

Content Provider	Springer Nature Link
Author	Praveena, K. Varma, K. B. R.
Copyright Year	2014
Abstract	Giant grained (42 μm) translucent Ba$_{5}$Li$_{2}$Ti$_{2}$Nb$_{8}$O$_{30}$ ceramic was fabricated by conventional sintering technique using the powders obtained via solid state reaction route. These samples were confirmed to possess tetragonal tungsten bronze structure (P4bm) at room temperature. The scanning electron microscopy established the average grain size to be close to 20 μm. The photoluminescence studies carried out on these ceramics indicated sharp emission bands around 433 and 578 nm at an excitation wavelength of 350 nm which were attributed to band-edge emission as the band gap was 2.76 eV determined by Kubelka–Munk function. The dielectric properties of these ceramics were studied over wide frequency range (100–1 MHz) at room temperature. The decrease in dielectric constant with frequency could be explained on the basis of Koops theory. The dielectric constant and the loss were found to decrease with increasing frequency. The Curie temperature was confirmed to be ~370 °C based on the dielectric anomaly observed when these measurements were carried out over a temperature range of 30–500 °C. This shows a deviation from Curie–Weiss behaviour and hence an indicator of the occurrence of disordering in the system, the γ = 1.23 which confirms the diffuse ferroelectric transition. These ceramics at room temperature exhibited P–E hysteresis loops, though not well saturated akin to that of their single crystalline counterparts. These are the suitable properties for ferroelectric random access memory applications.
Starting Page	3103
Ending Page	3108
Page Count	6
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	25
Issue Number	7
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2014-05-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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