Microwave Dielectric Properties of (1-x)Ba_(3.75)Nd_(9.5)Cr_(0.25)Nb_(0.25)Ti_(17.5)O_(54)-x NdAlO_3 Ceramics
Abstract
This study presents the microwave dielectric properties calculation of (1-x)Ba_(3.75)Nd_(9.5)Cr_(0.25)Nb_(0.25)Ti_(17.5)O_(54)–xNdAlO_3 ceramics where x denotes the volume molar fraction. From X-ray diffraction results, the solid solution limit is calculated to be about 0.76, where it forms a single BaNd_2Ti_4O_(12) phase in Region I (0≤x<0.76), and both BaNd_2Ti_4O_(12) and NdAlO_3 coexist in Region II (0.76≤x<1). The solid solution limit is confirmed by independently calculating it from the dielectric constant data. There is less than 4% deviation between the measured dielectric constant (εr) and the one calculated from the Maxwell-Wagner formula. The total quality factor (Q) remains almost constant in Region I and increases rapidly with the volume molar fraction of NdAlO_3 in Region II. The measured Q×f, where f is the resonant frequency, is also consistent with the calculated value in both regions. The temperature coefficient at the resonant frequency is −1.4 ppm/°C, which agrees well with the calculated value of 0 ppm/°C. In addition, we observed a close correlation between the bulk density and the phase evolution.
Additional Information
© 2017 The American Ceramic Society. Issue online: 5 September 2017; Version of record online: 22 May 2017; Accepted manuscript online: 2 May 2017; Manuscript Accepted: 25 April 2017; Manuscript Received: 9 November 2016. Hetuo Chen gratefully acknowledges support from the China Scholarship Council (CSC, 201506070064) during a visit to the California Institute of Technology. This work is supported by the Open Foundation of National Engineering Research Center of Electromagnetic Radiation Control Materials (ZYGX2014K003-6) and the National Natural Science Foundation of China (Grant No. 51672038 and 51402039). The authors also acknowledge St. Germaine-Fuller, James F. and Wei, Xiaoming revising the language of the paper.Attached Files
Accepted Version - jace14958.pdf
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Additional details
- Alternative title
- Microwave Dielectric Properties of (1-x)Ba3.75Nd9.5Cr0.25Nb0.25Ti17.5O54-x NdAlO3 Ceramics
- Eprint ID
- 77138
- DOI
- 10.1111/jace.14958
- Resolver ID
- CaltechAUTHORS:20170503-085855044
- 201506070064
- China Scholarship Council
- ZYGX2014K003-6
- Open Foundation of National Engineering Research
- 51672038
- National Natural Science Foundation of China
- 51402039
- National Natural Science Foundation of China
- Created
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2017-05-03Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field