Abstract
Ca9A(VO4)7 (A = La, Pr, Nd and Sm) ceramics have been prepared by conventional solid state ceramic route. The phase purity of the samples was confirmed by powder X-ray diffraction technique. Raman spectroscopic studies confirm the existence of (VO4)3− vibrational groups in Ca9A(VO4)7 ceramics. Ca9A(VO4)7 (A = La, Pr, Nd and Sm) ceramics exhibit microwave dielectric properties of εr = 9.8 to 10.4, Qxf = 4500 to 14,900 GHz and low temperature coefficient of resonant frequency τf = −3.8 to −10.2 ppm/°C. Ca9A(VO4)7 ceramics with A = La, Nd and Sm show good chemical compatibility with Ag electrode and can be used as candidate materials for LTCC applications.
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Acknowledgements
The authors are thankful to Dr. N. Raghu, Director, C-MET, Thrissur for extending the facilities to carry out the work. The authors are also thankful to the Board of Research in Nuclear Sciences, Mumbai for financial support under grant number 34/15/01/2014-BRNS/0906. One of the authors, E.K.Suresh is grateful to the Council of Scientific and Industrial Research (CSIR), India for the award of Senior Research Fellowship.
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Naveenraj, R., Unnimaya, A.N., Suresh, E.K. et al. Structure and microwave dielectric properties of double vanadate Ca9A(VO4)7 (A= La, Pr, Nd and Sm) ceramics for LTCC applications. J Electroceram 44, 59–67 (2020). https://doi.org/10.1007/s10832-019-00192-5
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DOI: https://doi.org/10.1007/s10832-019-00192-5