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Registration Number

0211U013373, 0111U009740 , R & D reports

Title

Microwave tunable materials, composites, and devices - 984091

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Head

Belous Anatolii,

Registration Date

26-12-2011

Organization

V.I.Vernadskii Institute of General and Inorganic Chemistry NASU

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Report on the 1st stage of R&D. 29 pp., 13 fig., 1 table., Object of investigation - policrystalline materials based on the solid solutions Ag(Nb1-xTax)O3 (ANT) with the perovskite structure The objective of R&D - development of new tunabe microwave materials, composite structures and microwave components with low dielectric loss and high sensitivity to the applied voltages. In the consequence of the stage 1 of R&D, tunable materials based on the solid solutions Ag(Nb1-xTax)O3 (ANT) with the perovskite structure have been investigated, and the chemical transformations occurring during their synthesis have been examined. The effect of the addition of low-melting dopants Zn2TiO4 and ZnB2O4 on sintering temperature of the ANT ceramics, their phase composition and microstructure have been determined. For the first time, due to the addition of low-melting dopants Zn2TiO4 and ZnB2O4 into the material's composition, a dense single-phase ceramics have been obtained after sintering in air, which demonstrated high level of dielectric properties including high permittivity (400-470) and low dielectric loss (tg d - 10-3). It has been determined that when ANT is doped with 1 wt. % Zn2TiO4 the relative coefficient of tunability nR in a material is as high as 10-15 % under relatively low sterngh of electric field (Е = 3 MV/м). Obtained results denote a promising application of the developed tunable dielectric materials in the voltage tunable components for the modern communication technique. As a result of the project activities, science-technical cooperation between scientists from Ukraine, Slovenia, and UK has been established. OXIDES, FERROELECTRICS, TUNABLE MATERIALS, PEROVSKITES

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В'юнов Олег Іванович
Дурилін Дмитро Олександрович
Коваленко Леонід Леонідович
Овчар Олег Вікторович
Пашкова Олена Володимирівна
Плутенко Тетяна Олександрівна
Солопан Сергій Олександрович
Ступін Юрій Дмитрович
Суслов Олександр Миколайович
Хоменко Борис Семенович