Subsolidus solution and ionic conductivity of rock-salt structured Li_3+5xTa_1−xO₄ electroceramics

• Autorzy: Shari S. , Tan K. B. , Khaw C. C. , Zainal Z. , Lee O. J. , Chen S. K.

Identyfikatory

DOI

10.2478/msp-2020-0047

• Języki publikacji: EN

Abstrakty

EN

Lithium tantalate solid solution, Li_3+5xTa_1−xO₄ was prepared by conventional solid-state reaction at 925 °C for 48 h. The XRD analysis confirmed that these materials crystallized in a monoclinic symmetry, space group C2/C and Z = 8, which was similar to the reported International Crystal Database (ICDD), No. 98-006-7675. The host structure, β-Li₃TaO₄ had a rock-salt structure with a cationic order of Li⁺:Ta⁵⁺ = 3:1 over the octahedral sites. A rather narrow subsolidus solution range, i.e. Li_3+5xTa_1−xO₄ (0 ⩽ x ⩽ 0.059) was determined and the formation mechanism was proposed as a replacement of Ta⁵⁺ by excessive Li⁺, i.e. Ta⁵⁺ ↔ 5Li⁺. Both Scherrer and Williamson-Hall (W-H) methods indicated the average crystallite sizes in the range of 31 nm to 51 nm. Two secondary phases, Li₄TaO_4.5 and LiTaO3 were observed at x = 0.070 and x = −0:013, respectively. These materials were moderate lithium ionic conductors with the highest conductivity of ~2.5 × 10^-3 Ω ^-1∙cm^-1 at x = 0, at 0 °C and 850 °C; the activation energies were found in the range of 0.63 eV to 0.68 eV.

Słowa kluczowe

EN

ionic conductivity; subsolidus solution; b-Li3TaO4; electrical properties

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2020
• Tom: Vol. 38, No. 3
• Strony: 465--474
• Opis fizyczny: Bibliogr. 29 poz., rys., tab.

Twórcy

autor

Shari S.

• Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia

autor

Tan K. B.

• Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia

autor

Khaw C. C.

• Department of Mechanical and Material Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, 43000 Bandar Sg Long Cheras, Malaysia

autor

Zainal Z.

• Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia

autor

Lee O. J.

• School of Fundamental Science, Universiti Malaysia Terengganu, 21300 Kuala Terengganu, Terengganu, Malaysia

autor

Chen S. K.

• Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia

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