Get access
Advertisement

Microwave and Infrared Dielectric Response of Temperature Stable (1−x)BaMoO4xTiO2 Composite Ceramics

Authors

  • Jing Guo,

    1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    2. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author
  • Di Zhou,

    1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    2. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author
  • Hong Wang,

    Corresponding author
    1. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    • Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author
  • Yuehua Chen,

    1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    2. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author
  • Yi Zeng,

    1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    2. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author
  • Feng Xiang,

    1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    2. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author
  • Ying Wu,

    1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    2. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author
  • Xi Yao

    1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an, China
    2. International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, China
    Search for more papers by this author

  • This work was supported by the National 973-project of China (2009CB623302), NSFC projects of China (61025002, 109790365), and National Project of International Science and Technology Collaboration (2009DFA51820).

Author to whom correspondence should be addressed. e-mail: hwang@mail.xjtu.edu.cn

Abstract

The (1−x)BaMoO4xTiO2 (= 0.0, 0.2, 0.3, 0.338, 0.4, 0.5, 0.66) ceramics were synthesized by the conventional mixed-oxide process. The sintering behaviors, phase composition, chemical compatibility with silver, and microwave dielectric properties of pure (1−x)BaMoO4xTiO2 ceramics and 0.662BaMoO4–0.338TiO2 ceramic with H3BO3CuO addition were studied. Infrared reflectivity spectra of (1−x)BaMoO4xTiO2 (0.2 ≤ x ≤ 0.4) composites were measured in the range of 50–4500 cm−1 at room temperature. X-ray diffraction analysis reveals that scheelite BaMoO4 and rutile TiO2 phase coexist with each other at 1275°C and both of them do not react with silver (Ag) at 850°C. When the mole fraction of TiO2 (x value) is 0.4, a temperature stable microwave dielectric material is obtained, with εr = 13.8, Q × f = 40 500 GHz (f = 8.02 G), and τf = −6.13 ppm/°C. Complex dielectric spectra gained from the infrared spectra were extrapolated down to microwave range, and they were in good agreement with the measured microwave permittivity and dielectric losses. With 5 wt% H3BO3 and 1 wt% CuO addition, the 0.662BaMoO4–0.338TiO2 ceramics can be sintered well below 900°C, and possess good microwave dielectric properties with εr = 14, Q × f = 48 360 GHz, and τf  = +13.9 ppm/°C.

Get access to the full text of this article

Ancillary