Abstract
Correlations of dielectric properties with electronic structure and phonon vibration of Ba0.4Sr0.6Ti1-y MnyO3 (y = 0.00-0.20) ceramics were studied by using spectroscopic techniques. High level of Mn substitution prevented the reduction of Ti4+ and enhanced the charge ordering of Ti3+/Ti4+, leading to materials with high Q values. An increase in the concentration of Mn resulted in hardening of the softest mode, which led to a reduction in relative permittivity, dielectric loss, and tunability with increasing y. Raman spectra revealed that higher vibration frequency of Ti-O bonds was related to lower relative permittivity, and narrower width of Mn-O stretching corresponded to a higher Q × f.
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