Ordering and microwave dielectric properties of Ba(Ni{sub 1/3}Nb{sub 2/3})O{sub 3} ceramics

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.1997.0074· OSTI ID:467277

Kim, I; Kim, Y ^[1]; Chung, S J ^[2]

---

1. Ceramics Division, Korea Institute of Science and Technology, P. O. Box 131, Cheongryang, Seoul (Korea)
2. Department of Inorganic Materials Engineering, Seoul National University, Seoul 151-742 (Korea)

Ordering and microwave dielectric properties of Ba(Ni{sub 1/3}Nb{sub 2/3})O{sub 3} have been investigated using x-ray diffraction, transmission electron microscopy, energy-dispersive spectroscopy, and a network analyzer. Samples sintered at 1400{degree}C for 2 h were disordered and showed the presence of Nb-rich liquid phase at grain boundary junctions. Degree of ordering increased with following annealing at 1300{degree}C. Growth of the ordered region during annealing process was discussed in terms of nucleation and growth. A long-range order parameter was calculated using structure factor. Measurements of microwave dielectric properties showed that permittivity and temperature coefficient of resonant frequency decreased with ordering, and quality factor increased with ordering. The correlation between microwave dielectric properties and ordering was discussed in terms of covalency of bonding, inhomogeneous charge distribution, and defects concentration. {copyright} {ital 1997 Materials Research Society.}

• OSTI ID: 467277
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 2 Vol. 12; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
BARIUM OXIDES
CERAMICS
CHARGE DISTRIBUTION
CRYSTAL DEFECTS
DIELECTRIC PROPERTIES
MICROWAVE RADIATION
NICKEL OXIDES
NIOBIUM OXIDES
ORDER PARAMETERS
PERMITTIVITY
STRUCTURE FACTORS
TEMPERATURE RANGE 1000-4000 K