Phase evolution and Sn-substitution in LiMn2O4 thin films prepared by pulsed laser deposition

Dong Wook Shin, Ji Won Choi, Yong Soo Cho, Seok Jin Yoon

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

LiMn2O4 thin films prepared on a Pt/Ti/SiO 2/Si(100) substrate by pulsed laser deposition were studied with focusing on the effects of different processing conditions and Sn substitution on phase evolvement and surface microstructure. Major experimental parameters include substrate temperature up to 770 °C and working oxygen pressure of 50-250 mTorr. LiMn2O4 thin films became highly crystallized with increased grain sizes as the substrate temperature increased. Second phases such as LiMnO2 and Li2Mn2O 4 were found at the temperature of 300 and 770 °C, respectively. As an optimum condition, films grown at 450 °C showed a homogeneous spinel phase with well-defined crystallinity and smooth surface. A high pressure of oxygen tended to promote crystallization and grain growth. Working pressure did not affect significantly the phase formation of the thin films except that unexpected LiMn3O4 phase formed at the lowest oxygen pressure of 50 mTorr. Tin-substituted thin films showed lower Mn-O stretching vibrations, which suggests that more Li-ions can be inserted into vacant octahedral sites of the spinel structure.

Original languageEnglish
Pages (from-to)200-205
Number of pages6
JournalJournal of Electroceramics
Volume23
Issue number2-4
DOIs
Publication statusPublished - 2009 Oct 1

Fingerprint

Pulsed laser deposition
pulsed laser deposition
Substitution reactions
substitutes
Thin films
Oxygen
thin films
spinel
oxygen
Substrates
Tin
Crystallization
Grain growth
Temperature
Stretching
temperature
crystallinity
tin
grain size
Ions

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Mechanics of Materials

Cite this

Shin, Dong Wook ; Choi, Ji Won ; Cho, Yong Soo ; Yoon, Seok Jin. / Phase evolution and Sn-substitution in LiMn2O4 thin films prepared by pulsed laser deposition. In: Journal of Electroceramics. 2009 ; Vol. 23, No. 2-4. pp. 200-205.
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Phase evolution and Sn-substitution in LiMn2O4 thin films prepared by pulsed laser deposition. / Shin, Dong Wook; Choi, Ji Won; Cho, Yong Soo; Yoon, Seok Jin.

In: Journal of Electroceramics, Vol. 23, No. 2-4, 01.10.2009, p. 200-205.

Research output: Contribution to journalArticle

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