Microwave dielectric properties of NaxNd(2-x)/3TiO3 solid solutions

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 55; no. 12; pp. 2582 - 2585
• Main Authors: Kagomiya, I., Yamada, Y., Kakimoto, K.-i., Ohsato, H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-12-2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Ceramics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric properties of solids and liquids; Dielectrics; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Lattices; Materials science and technology; Physics; Plugs; Reflection; Solids; Sparks; Disordered systems; Vacancies; Solid solutions; Quality factor; Microwave radiation; Dielectric losses; Dielectric properties; Tetragonal crystals; Perovskites; XRD; Orthorhombic crystals
• ISSN: 0885-3010; 1525-8955
• DOI: 10.1109/TUFFC.2008.974

Na x Nd (2-x)/3 TiO 3 solid solutions possess tetragonal or orthorhombic perovskite structure, where the A-sites are characterized by 2 kinds of cations (Na + , Nd 3+ ) and vacancies. We have measured microwave dielectric properties of Na x Nd (2-x)/3 TiO 3 solid solutions (x = 0.05 to 0.5) to investigate an effect of the compositional ordering in the A-sites of the perovskite structure. According to powder X-ray diffraction, the A-site is disordered in the composition range of x = 0.29 to 0.5. A compositional ordering (Na + , vacancy / Nd 3 + ) in Asites appeared when x = 0.05 to 0.2. The quality factor (Qmiddotf), where Q is the inverse of dielectric loss and f is frequency, was found to be slightly improved with decreasing Na content in the range of x = 0.05 to 0.2, suggesting that the Qmiddotf of the Na x Nd (2-x)/3 TiO 3 solid solutions depends on the compositional ordering in A-sites.