^<57>Fe Mossbauer and DTA study of R_2O・2FeO・V_2O_5・P_2O_5 glasses (R = Li, Na)

Hiroshi Kurimoto, Tetsuaki Nishida, Shigeto Okada, Jun-ichi Yamaki

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The <sup>57</sup>Fe Mössbauer spectra of <i>x</i>Li<sub>2</sub>O·2FeO·V<sub>2</sub>O<sub>5</sub>·P<sub>2</sub>O<sub>5</sub> and <i>x</i>Na<sub>2</sub>O·2FeO·V<sub>2</sub>O<sub>5</sub>·P<sub>2</sub>O<sub>5</sub> glasses (<i>x</i> = 0, 0.5, 1.0 and 1.5) consist of two doublets due to Fe<sup>II</sup> and Fe<sup>III</sup>. The isomer shift indicates that Fe<sup>III</sup> atoms form Fe<sup>III</sup>O<sub>4</sub> tetrahedra or Fe<sup>III</sup>O<sub>6</sub> octahedra, while Fe<sup>II</sup> atoms from Fe<sup>II</sup>O<sub>6</sub> octahedra. A liner relationship exists between the glass transition temperature, <i>T</i><sub>g</sub>, and the quadrupole splitting, Δ, of Fe<sup>III</sup> atoms in the Mössbauer spectra. Slopes of the straight lines were estimated to be 460 and 370°C (mm s<sup>-1</sup>)<sup>-1</sup> in <i>x</i>Li<sub>2</sub>O·2FeO·V<sub>2</sub>O<sub>5</sub>·P<sub>2</sub>O<sub>5</sub> and <i>x</i>Na<sub>2</sub>O·2FeO·V<sub>2</sub>O<sub>5</sub>·P<sub>2</sub>O<sub>5</sub> glasses, respectively. These results suggest that Fe<sup>III</sup> atoms form oxygenpolyhedra that are intermediate between Fe<sup>III</sup>O<sub>4</sub> tetrahedra and Fe<sup>III</sup>O<sub>6</sub> octahedra. The electric conductivity obtained by a dc four-probe method was of the order of 10<sup>-5</sup> to 10<sup>-6</sup> S cm<sup>-1</sup>.
Original languageEnglish
Pages (from-to)637-640
Number of pages4
JournalJournal of the Ceramic Society of Japan
Issue number1353
Publication statusPublished - May 1 2008


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