Dielectric spectroscopy of Dy{sub 2}O{sub 3} doped (K{sub 0.5}Na{sub 0.5})NbO{sub 3} piezoelectric ceramics

Journal Article · Thu Apr 24 00:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4872502· OSTI ID:22271056

Mahesh, P., E-mail: [e-mail]; Subhash, T., E-mail: [e-mail]; Pamu, D., E-mail: [e-mail] ^[1]

---

1. Department of Physics, Indian Institute of Technology, Guwahati-781039 (India)

We report the dielectric properties of (K{sub 0.5}Na{sub 0.5})NbO{sub 3} ceramics doped with x wt% of Dy{sub 2}O{sub 3} (x= 0.0-1.5 wt%) using the broadband dielectric spectroscopy. The X-ray diffraction studies showed the formation of perovskite structure signifying that Dy{sub 2}O{sub 3} diffuse into the KNN lattice. Samples doped with x > 0.5 wt% exhibit smaller grain size and lower relative densities. The dielectric properties of KNN ceramics doped with Dy{sub 2}O{sub 3} are enhanced by increasing the Dy{sup 3+} content; among the compositions studied, x = 0.5 wt% exhibited the highest dielectric constant and lowest loss at 1MHz over the temperature range of 30°C to 400°C. All the samples exhibit maximum dielectric constant at the Curie temperature (∼ 326°C) and a small peak in the dielectric constant at around 165°C is due to a structural phase transition.

• OSTI ID: 22271056
• Journal Information: AIP Conference Proceedings, Vol. 1591, Issue 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
CURIE POINT
DOPED MATERIALS
DYSPROSIUM IONS
DYSPROSIUM OXIDES
GRAIN SIZE
NIOBATES
PERMITTIVITY
PHASE TRANSFORMATIONS
PIEZOELECTRICITY
POTASSIUM COMPOUNDS
RELAXATION LOSSES
SODIUM COMPOUNDS
SPECTROSCOPY
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION