Preparation and characterization of two new dielectric ceramics Ba4NdTiNb3O15 and Ba3Nd2Ti2Nb2O15

• Published in: Journal of materials science. Materials in electronics Vol. 15; no. 12; pp. 803 - 805
• Main Authors: LIANG FANG, DIAO, C. L, HUI ZHANG, YUAN, R. Z, DRONSKOWSKI, Richard, LIU, H. X
• Format: Journal Article
• Language: English
• Published: Norwell, MA Springer 01.12.2004; Springer Nature B.V
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Dielectric properties; Dielectric properties of solids and liquids; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Electron microscopes; Exact sciences and technology; Materials science; Materials synthesis; materials processing; Permittivity (dielectric function); Physics; Microwave radiation; Neodymium oxides; Phase analysis; Dielectric ceramics; Titanium oxides; Temperature coefficient; Electric resonance; Multi-element compounds; Powder technology; Quality factor; Barium oxides; Solid state reaction; Niobium oxides; Microstructure; Permittivity; Crystal structure
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1023/B:JMSE.0000045303.12402.08

Two new cation-deficient hexagonal perovskites Ba4NdTiNb3O15 and Ba3Nd2Ti2Nb2O15 were prepared in the BaO-Nd2O3-TiO2-Nb2O5 system by high temperature solid-state reaction. The phase and structure of the ceramics were characterised by XRD and SEM. The microwave dielectric properties of the ceramics were studied using a network analyser. Ba4NdTiNb3O15 had a dielectric constant of 38.15, a high quality factor (Qxf > 18700 at 5.4422 GHz), and a small temperature coefficient of resonant frequency (tauf +12 ppm/C) at room temperature; Ba3Nd2Ti2Nb2O15 had a higher dielectric constant of 46.83 with high quality factor (Qxf > 19500 at 5.0980 GHz), and tauf +28 ppm/C. 18 refs.