Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published September 2017 | Accepted Version
Journal Article Open

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

Files

jace14958.pdf
Files (1.3 MB)
Name Size Download all
md5:5e1193fac9017c1f8cb106de339a000d
1.3 MB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 25, 2023