Crystal Structure and Optical Characterization of Pure and Nd-Substituted Type III KGd(PO3)4

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• 作者：I. Parreu ; J. J. Carvajal ; X. Solans ; F. Dí ; az ; and M. Aguil&oacute
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：January 10, 2006
• 年：2006
• 卷：18
• 期：1
• 页码：221 - 228
• 全文大小：272K
• 年卷期：v.18,no.1(January 10, 2006)
• ISSN：1520-5002

文摘

The crystal structure of type III KGd(PO₃)₄ has been solved, and the related data are presented in thispaper. KGd(PO₃)₄ (KGP) is monoclinic and has P2₁ as space group. Its cell parameters are a = 7.255(4)Å, b = 8.356(5) Å, c = 7.934(5) Å, mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle"> = 91.68(5)mages/entities/deg.gif">, and Z = 2. KGP is characterized by infinitepolyphosphate long chains, which run along the [100] direction and are linked through gadoliniumpolyhedra. We determined the crystallization region of KGd_0.47Nd_0.53(PO₃)₄, and compared it to those ofKGP and KNd(PO₃)₄ (KNP). The isotherms of the saturation temperature and four neighboring phaseswere also determined. Small Nd-substituted KGP single crystals free of macroscopic defects weresuccessfully grown under conditions similar to those used to grow KGP and KNP crystals. Nd substitutionon the structure was efficient, and its effect was analyzed. We determined the transparency windows ofboth KGP and KNP crystals, and evaluated the optical tensors at room temperature and 632.5 nm. Finally,we used the Kurtz method to qualitatively measure the second harmonic efficiencies of Nd-substitutedKGP crystals. The values obtained for all substitutions were similar to those showed by KGP and KNPand at least to that of H₂PO₄ (KDP).