EPR Investigation on the Phase Transition of Mn-Doped BaTiO3 PTCR Ceramics

Journal of Inorganic Materials

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EPR Investigation on the Phase Transition of Mn-Doped BaTiO₃ PTCR Ceramics

QIAN Chen¹; LI Yong²; TANG Xiao-Feng¹; TANG Zi-Long¹; QIAN Jin¹; ZHOU Zhi-Gang ¹

1.State Key Laboratory of New Ceramics and Fine Processing; Department of Materials Science & Engineering; Tsinghua University; Beijing 100084; China; 2.Department of Chemistry; Tsinghua University, Beijing 100084, China

Received:2000-06-13 Revised:2000-08-07 Published:2001-07-20 Online:2001-07-20

Abstract

Abstract: The EPR (Electron Paramagnetic Resonance) spectra of Mn-doped BaTiO₃ PTCR ceramics measured at 120~450K were studied. The signal intensity, the g factors and the hyperfine splitting constants |A| of Mn²⁺ at different temperatures were calculated. The results show that these parameters obviously correspond to the different phases of BaTiO₃ based PTCR ceramics. This research indicates that EPR method can provide a new way to study upon mechanism of phase transition for PTCR ceramics.

Key words: BaTiO₃ PTCR ceramics, phase transition, EPR, Mn²⁺ signal, g factor, hyperfine splitting constants

CLC Number:

TN304

QIAN Chen,LI Yong,TANG Xiao-Feng,TANG Zi-Long,QIAN Jin,ZHOU Zhi-Gang. EPR Investigation on the Phase Transition of Mn-Doped BaTiO₃ PTCR Ceramics[J]. Journal of Inorganic Materials.

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EPR Investigation on the Phase Transition of Mn-Doped BaTiO₃ PTCR Ceramics

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