Structure and microwave dielectric characteristics of lithium-excess Ca{sub 0.6}Nd{sub 0.8/3}TiO{sub 3}/(Li{sub 0.5}Nd{sub 0.5})TiO{sub 3} ceramics

Journal Article · Fri Nov 15 04:00:00 EST 2013 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2013.07.025· OSTI ID:22285226

Zhou, Changrong ^[1]; Chen, Guohua ^[1]; Cen, Zhenyong; Yuan, Changlai; Yang, Yun ^[1]; Li, Weizhou ^[2]

---

1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, Guangxi 541004 (China)
2. School of Materials Science and Engineering, Guangxi University, Nanning, Guangxi 530004 (China)

Graphical abstract: - Highlights: • Dense ceramics were fabricated by the conventional solid-state route. • Excess-Li addition lowers sintering temperature. • Excess-Li addition improves the relative density and microwave dielectric properties. - Abstract: Compositions based on (1−x)Ca{sub 0.6}Nd{sub 8/3}TiO{sub 3}−x(Li{sub 1/2}Nd{sub 1/2})TiO{sub 3} + yLi (CNLNTx + yLi, x = 0.30–0.60, y = 0–0.05), suitable for microwave applications have been developed by systematically adding excess lithium in order to tune the microwave dielectric properties and lower sintering temperature. Addition of 0.03 excess-Li simultaneously reduced the sintering temperature and improved the relative density of sintered CNLNTx ceramics. The excess Li addition can compensate the evaporation of Li during sintering process and decrease the secondary phase content. The CNLNTx (x = 0.45) ceramics with 0.03 Li excess sintered at 1190 °C have single phase orthorhombic perovskite structure, together with the optimum combination of microwave dielectric properties of ε{sub r} = 129, Q × f = 3600 GHz, τ{sub f} = 38 ppm/°C. Obviously, excess-Li addition can efficiently decrease the sintering temperature and improve the microwave dielectric properties. The high permittivity and relatively low sintering temperatures of lithium-excess Ca{sub 0.6}Nd{sub 0.8/3}TiO{sub 3}/(Li{sub 0.5}Nd{sub 0.5})TiO{sub 3} ceramics are ideal for the development of low cost ultra-small dielectric loaded antenna.

• OSTI ID: 22285226
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 48; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
DIELECTRIC MATERIALS
LITHIUM
MICROSTRUCTURE
MICROWAVE RADIATION
ORTHORHOMBIC LATTICES
PERMITTIVITY
PEROVSKITE
TITANIUM OXIDES
X-RAY DIFFRACTION