It is noticed that the appearance of dielectric permittivity undergoes a sharp increase in operating temperature only in the low-frequency zone (<10 kHz), but in the high-frequency zone (25 kHz ≤ dielectric permittivity ≤1000 kHz) an increasing trend is for it to be very slow for all temperatures and to remain almost constant.
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Structural, electrical, and multiferroic characteristics of lead-free multiferroic: Bi(Co<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>3</sub>-BiFeO<sub>3</sub> solid solution.
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The sentences
Such a decreasing trend of a real component of impedance with rising temperature in the low-frequency region reveals the negative temperature coefficient of resistance phenomenon.