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• 作者：J. J. Carvajal ; J. L. Garcí ; a-Muñ ; oz ; R. Solé ; Jna. Gavaldà ; J. Massons ; X. Solans ; F. Dí ; az ; and M. Aguiló
• 刊名：Chemistry of Materials
• 出版年：2003
• 出版时间：June 17, 2003
• 年：2003
• 卷：15
• 期：12
• 页码：2338 - 2345
• 全文大小：183K
• 年卷期：v.15,no.12(June 17, 2003)
• ISSN：1520-5002

文摘

We used X-ray single-crystal diffraction (XRD) and high-resolution neutron powderdiffraction (NPD) and performed second-harmonic generation (SHG) measurements toinvestigate the structural details and nonlinear optical (NLO) properties of Rb_0.855Ti_0.955Nb_0.045OPO₄ and RbTi_0.927Nb_0.056Er_0.017OPO₄. We studied in detail the distribution of Nb⁵⁺and Er³⁺ doping cations among the different types of TiO₆ octahedra in the structure. Wefound that Nb cations exclusively occupied Ti(1) sites, but we did not observe a preferentialoccupation of the octahedra by Er. Our results established that, in Rb_0.855Ti_0.955Nb_0.045OPO₄,the substitution of Ti⁴⁺ by Nb⁵⁺ centers was compensated by the creation of Rb⁺ vacancies.The SHG measurements in these crystals reveal that these crystals are excellent nonlinearoptical materials and that the absorption of the generated green light by Er³⁺ in the RbTi_0.927Nb_0.056Er_0.017OPO₄ crystal is negligible.