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Radiation Effects and Defects in Solids
Incorporating Plasma Science and Plasma Technology
Volume 174, 2019 - Issue 7-8
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Articles

Substitutional site of Mn4+ ion and local compressibility of this Mn4+ center in Mn4+-doped Sr4Al14 O25 crystal

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Pages 687-690 | Received 06 Dec 2018, Accepted 08 Jun 2019, Published online: 24 Jun 2019
 

ABSTRACT

The local compressibility of (MnO6)8− octahedral cluster for Mn4+ ion in the octahedral Al3+ site of Sr4Al14O25:Mn4+ crystal is investigated by analyzing the dominant pressure dependence of R-line position (i.e. 2E→4A2 transition). The obtained local compressibility is much greater than that in Al2O3: Mn4+ crystal, suggesting that the average Al3+–O2− distance R¯ of the replaced (AlO6)9− octahedron in Sr4Al14O25 is much greater than that in Al2O3. By comparing the average Al3+–O2− distances R¯ in the three octahedral Al3+ sites, Al4, Al5 and Al6, in Sr4Al14O25 crystal, we propose that the dominant substitutional site of Mn4+ ion is Al4 site which has the largest average Al3+–O2− distance. The results are discussed.

Disclosure statement

No potential conflict of interest was reported by the authors.

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