Mn-substituted spinel Li4Ti5O12 materials studied by multifrequency EPR spectroscopy

Kaftelen H., Tuncer M., Tu S., Repp S., Gocmez H., Thomann R., ...Daha Fazla

JOURNAL OF MATERIALS CHEMISTRY A, cilt.1, sa.34, ss.9973-9982, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1 Sayı: 34
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1039/c3ta11590a
  • Dergi Adı: JOURNAL OF MATERIALS CHEMISTRY A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.9973-9982
  • Karadeniz Teknik Üniversitesi Adresli: Hayır

Özet

In this contribution we report on the influence of Mn doping on various physical properties of Li4Ti5-xMnxO12 (x = 0, 0.005, 0.025, 0.01, 0.05, 0.075, 0.1 and 0.2). Spinel-type (space group Fd3m, a = 0.8358 nm) Li4Ti5-xMnxO12 was produced as highly uniform and polyhedral shaped powder in a size range between 200 and 400 nm. The crystal structure of Li4Ti5-xMnxO12, the morphology and the Mn-ion distribution have been investigated by X-ray diffraction (XRD) and scanning and transmission electron microscopies (SEM and TEM). The oxidation state of Mn and the conductivity behavior of Mn-substituted Li4Ti5-xMnxO12 samples have been studied using multi-frequency electron paramagnetic resonance (EPR). Mn is incorporated as Mn2+, and these ions increase the conductivity of Li4Ti5O12; a conductivity value of 0.48 x 10(-8) S cm(-1) was measured for Li4Ti5-xMnxO12 with x = 0.075, which is tenfold larger than that of undoped Li4Ti5O12.