Site occupancy of Bi ions and microwave dielectric properties in Bi-doped Ba6-3xR8+2xTi18O54 (R = rare earth, x = 2/3) solid solutions

• Published in: Materials chemistry and physics Vol. 79; no. 2-3; pp. 199 - 203
• Main Authors: OKAWA, T, IMAEDA, M, OHSATO, H, HARADA, A
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Lausanne Elsevier 10-04-2003
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Physics; Site; Solid solutions; Microwave radiation; Rare earths; Dielectric properties; Doping; Ions
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/s0254-0584(02)00258-4

The tungsten bronze-type like Ba6-3xR8+2xTi18O54 (R = rare earth) solid solutions, which have excellent microwave dielectric properties, have been investigated about the effect of substituting Bi ions on the lattice parameters and the phase structure. The x-values for the Ba6-3x(R(8+2x)-yBiy)Ti18O54 formula were fixed at x = 2/3, and the y-values were varied from 0.0 to 0.3. In the case of La and Nd series which are widely used in the dielectric resonator applications, it seems that until y = 0.05 Bi ions substituted for Ba ions, and thereafter for La or Nd ions from y = 0.05 to 0.3. In the case of La and Nd series, the dielectric constant (sr) decreased in the early stage of O < y < 0.1 and O < y < 0.05.