Microwave dielectric properties of (Pb{sub 1-3x/2}La{sub x})(Mg{sub 1/2}W{sub 1/2})O{sub 3}

Journal Article · Tue Nov 02 04:00:00 EST 2004 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2004.06.006· OSTI ID:20883059

Jianjiang, Bian ^[1]; Gaohong, Bo ^[1]; Xiaowu, Wang ^[1]

---

1. Department of Inorganic Materials, Shanghai University, 149 Yanchang Road, Zhabei District, Shanghai 200072 (China)

La modified Pb(Mg{sub 1/2}W{sub 1/2})O{sub 3} were prepared by solid-state reaction process, and the sintering behavior, microstructure and microwave dielectric properties were investigated by X-ray powder diffraction (XRD), Raman scattering and HP network analyzer in this paper. A series of single phase perovskite type solid solutions with A-site vacancies (Pb{sub 1-3x/2}La{sub x}(Mg{sub 1/2}W{sub 1/2})O{sub 3} (0 {<=} x {<=} 2/3)) were formed. The solid solution took cubic perovskite type structure (Fm3m) with random distribution of A-site vacancies when 0 < x < 0.5, and tetragonal or orthorhombic structure with the ordering of A-site vacancies when 0.5 {<=} x {<=} 2/3. The dielectric constant and temperature coefficient of resonant frequency decrease with increasing La content. Relatively good combination microwave dielectric properties were obtained for x = 0.56: {epsilon}{sub r} = 28.7; Q x f = 18098; and {tau}{sub f} = -5.8 ppm/ deg. C.

• OSTI ID: 20883059
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 13 Vol. 39; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
FCC LATTICES
LANTHANUM OXIDES
LEAD OXIDES
MANGANESE OXIDES
MICROSTRUCTURE
MICROWAVE RADIATION
ORTHORHOMBIC LATTICES
PERMITTIVITY
PEROVSKITE
RAMAN EFFECT
SINTERING
SOLID SOLUTIONS
TEMPERATURE COEFFICIENT
VACANCIES
X-RAY DIFFRACTION