Morphology evolution of $CaMoO_4$ crystals

$CaMoO_4$ 결정 형태의 전개

  • Published : 2008.10.31

Abstract

$CaMoO_4$ crystals with ellipsoid, peanut, dumbbell, and notched sphere shapes were synthesized using a simple precipitation reaction. The morphology of $CaMoO_4$ crystals evolved from ellipsoids, through peanut-like structures and dumbbells, to notched spheres with increasing the concentration of $Ca^{2+}$ and $MoO_4^{2-}$ ions. This morphology evolution of $CaMoO_4$ crystals is attributed to a fractal mechanism. Branched crystal growth started at both ends of the ellipsoids. The peanut-like and dumbbell morphologies were formed by the first and second fractal growths, respectively. Finally, the notched spheres were formed by further fractal growth of dumbbells.

단순 침전법으로 타원, 땅콩, 아령, 바디가 있는 구형 모양의 $CaMoO_4$ 결정을 합성하였다. $Ca^{2+}$ 이온과 $MoO_4^{2-}$ 이온 농도가 증가함에 따라서 $CaMoO_4$의 형태는 차원형에서 땅콩 모양과 아령 모양을 거쳐서 마디가 있는 구형 모양으로 전개됨을 확인하였다. 이러한 $CaMoO_4$ 결정의 형태의 전개는 프랙탈 메커니즘에 기인한다. 타원형의 양 끝 부분에서부터 가지를 치면서 결정 성장이 시작된다. 1차와 2차 프랙탈 성장에 의해서 땅콩 모양과 아령 모양이 각각 형성되었다. 아령 모양에서 더 프랙탈 성장을 하여 최종적으로 마디가 있는 구형이 형성되었다.

Keywords

References

  1. T.T. Basiev, A.A. Sobol, P.G. Zverev, L.I. Ivleva, V.V. Osiko and R.C. Powell, "Raman spectroscopy of crystals for stimulated Raman scattering", Opt. Mater. 11(4) (1999) 307 https://doi.org/10.1016/S0925-3467(98)00030-5
  2. T.T. Basiev, A.A. Sobol, Y.K. Voronko and P.G. Zverev, "Spontaneous Raman spectroscopy of tungstate and molybdate crystals for Raman lasers", Opt. Mater. 15(3) (2000) 205 https://doi.org/10.1016/S0925-3467(00)00037-9
  3. A.B. Campos, A.Z. Simoes, E. Longo, J.A. Varela, V.M. Longo, A.T. de Figueiredo, F.S. de Vincente and A.C. Hermandes, "Mechanism behind blue, green, and red photoluminescence emissions in $CaWO_4$ and $CaMoO_4$ powders", Appl. Phys. Lett. 91(5) (2007) 051923 https://doi.org/10.1063/1.2766856
  4. A.P. de Marques. V.M. Longo, D.M.A. de Melo, P.S. Pizani, E.R. Leite, J.A. Varela and E. Longo, "Shape controlled synthesis of $CaMoO_4$ thin films and their photoluminescence property", J. Solid St. Chem. 181(5) (2008) 1249 https://doi.org/10.1016/j.jssc.2008.01.051
  5. F. Lei and B. Yan, "Hydrothermal synthesis and luminescence of $CaMO_4$ : $RE^{3+}$ (M =W, Mo; RE = Eu, Tb) submicro-phosphors", J. Solid St. Chem. 181(4) (2008) 855 https://doi.org/10.1016/j.jssc.2008.01.033
  6. Y. Jin, J. Zhang, S. Lu, H. Zhao, X. Zhang and X.J. Wang, "Fabrication of $Eu^{3+}$and $Sm^{3+}$ codoped micro/nanosized $MMoO_4$ (M = Ca, Ba, and Sr) via facile hydrothermal method and their photoluminescence properties through energy transfer", J. Phys. Chem. C 112(15) (2008) 5860 https://doi.org/10.1021/jp800559f
  7. S. Yu, Z. Lin, L. Zhang and G. Wang, "Preparation of monodispersed $Eu^{3+} : $CaMoO_4$ nanocrystals with single quasihexagon", Cryst. Growth Des. 7(12) (2007) 2397 https://doi.org/10.1021/cg060611o
  8. J.H. Ryu, J.W. Yoon, C.S. Lim, W.C. Oh and K.B. Shim, "Microwave-assisted synthesis of $CaMoO_4$ nanopowders by a citrate complex method and its photoluminescence property", J. Alloy Compd. 390(1-2) (2005) 245 https://doi.org/10.1016/j.jallcom.2004.07.064
  9. T. Thongtem, A. Phuruangrat and S. Thongtem, "Characterization of $MMoO_4$ (M = Ba, Sr and Ca) with different morphologies prepared using a cyclic microwave radiation", Mater. Lett. 62(3) (2008) 454 https://doi.org/10.1016/j.matlet.2007.05.059
  10. Y. Wang, J. Ma, J. Tao, X. Zhu, J. Zhou, Z. Zhao, L. Xie and H. Tian, "Low temperature synthesis of $CaMoO_4$ nanoparticles", Ceram. Int. 33(4) (2007) 693 https://doi.org/10.1016/j.ceramint.2005.11.003
  11. D. Chen, K. Tang, F. Li and H. Zheng, "A simple aqueous mineralization process to synthesize tetragonal molybdate microcrystallites", Cryst. Growth Des. 6(1) (2006) 247 https://doi.org/10.1021/cg0503189
  12. Y. Liang, X. Han, Z. Yi, W. Tang, L. Zhou, J. Sun, S. Yang and Y. Zhou, "Synthesis, characterization and lithium- intercalation properties of rod-like $CaMoO_4$ nanocrystals", J. Solid St. Electrochem. 11(8) (2007) 1127 https://doi.org/10.1007/s10008-006-0249-1
  13. Q. Gong, X. Qian, X. Ma and Z. Zhu, "Large-scale fabrication of novel hierarchical 3D $CaMoO_4$ and $SrMoO_4$ mesocrystals via a microemulsion-mediated route", Cryst. Growth Des. 6(8) (2006) 1821 https://doi.org/10.1021/cg060133h
  14. S.H. Yu, H. Colfen and M. Antonietti, "Polymer-controlled morphosynthesis and mineralization of metal carbonate", J. Phys. Chem. B 107(30) (2003) 7396 https://doi.org/10.1021/jp034009+
  15. S. Busch, H. Dolhaine, A. DuChesne, S. Heinz, O. Hochrein, F. Laeri, O. Podebrad, U. Vietze, T. Weiland and R. Kniep, "Biomimetic morphogenesis of fluorapatite- gelatin composites: fractal growth, the question of intrinsic electric fields, core/shell assemblies, hollow spheres and reorganization of denatured collagen", Eur. J. Inorg. Chem. 1999(10) (1999) 1643 https://doi.org/10.1002/(SICI)1099-0682(199910)1999:10<1643::AID-EJIC1643>3.0.CO;2-J