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3+ valence states of the ceramics. Impedance spectroscopy of the ceramics has been performed in the frequency range of 10 Hz to 3 GHz by low frequency and microwave impedance spectrometers. Two- and four-probe methods were used for measurements at low frequencies. The LiFePO 4 /C composite was investigated in nitrogen gas, and the measurements of LiFePO 4 were conducted in air. The measurements of the electrical properties of the ceramics were carried out in the temperature interval of 300–500 K.

SEM/EDX, XPS, and impedance spectroscopy of LiFePO<sub>4</sub> and LiFePO<sub>4</sub>/C ceramics