Nanoparticles of neodymium orthophosphate (NdPO4) were prepared through a facile wet co-precipitation technique. The X-ray diffraction (XRD) studies revealed the material belonging to monoclinic monazite phase with crystallite size of 30.8 nm. Scanning electron microscopic studies showed that the material was composed of a large number of agglomerated spherical particles having grain size of 92 nm. Thermogravimetric analysis suggested that the structural phase transition was seen above 800 °C. The spectroscopic investigations were carried out using Fourier transform infrared spectroscopy (FTIR). UV-VIS-NIR ab-sorption spectrophotometer showed various transitions from the ground state 4I9/2 to various excited states within the 4f shell and the optical band gap came out to be 3.3 eV. The dielectric constant (ε′), dielectric loss (tanδ) and ac conductivity ln(σac) were measured in the frequency range of 5 kHz to 1 MHz and in the temperature range of 40 to 500 °C. The dielectric measurement suggested that there was a shift in the value of transition temperature (Tc), thereby indicating relaxor behaviour of the material. The activation energy value decreased with increase in frequency, thereby suggesting the role of mixed ionic-polaronic conduc-tivity.
参考文献
| [1] | Blasse G, Bril A. Luminescence of phosphors based on host lattices ABO4(A is Sc, In;B is P, V, Nb). J. Chem. Phys., 1969, 50:2974.,1969. |
| [2] | Kaya C, Butler E G, Selcuk A, Boccaccinni A R, Lewis M H. Mullite(NextelTM 720)fibre-reinforced mullite matrix composites exhibiting favourable thermomechanical prop-erties. J. Eur. Ceram. Soc., 2002, 22:2333.,2002. |
| [3] | Sanker S, Warrier K G, Komban R. High surface area neodymium phosphate nano particles by modified aqueous sol-gel method. Mater. Res. Bull., 2011, 46:2373.,2011. |
| [4] | Boatner L A, Beall G W, Abraham M M, Finch C B, Huray P G, Pappaz M. Monazite and other Lanthanide or-thophosphates as alternate actinide waste form. Adv. Nucl. Sci. Tech., 1980, 14:289.,1980. |
| [5] | Meldrum A, Boatner L A, Ewing R C. Displacive radia-tion effects in the monzite-and zircon-structure ortho-phosphate. Phys. Rev. B, 1997, 56:13805.,1997. |
| [6] | Kijkowska R, Cholewka E, Duszak B. X-ray diffraction and IR-absorption characteristics of lanthanide orthophos-phate obtained by crystallization from phosphoric acid. J. Mater. Sci., 2003, 38:223.,2003. |
| [7] | Onoda H, Nariai H, Maki H, Motooka I. Synthesis of various rare earth phosphates from some rare earth com-pounds. Mater. Chem. Phys., 2002, 73:19.,2002. |
| [8] | Sheng Q L, Luo K, Li L, Zheng J B. Direct electrochemis-try of glucose oxidase immobilized on NdPO4 nanoparti-cles/chitosan composite film on glassy carbon electrodes and its biosensing application. Bioelectrochem., 2009, 74:246.,2009. |
| [9] | Poitrasson F, Oelkers E, Schott J, Montel A M. Experimental determination of synthetic NdPO4 monazite end-member solubility in water from 21°C to 300 °C:im-plications for rare earth element mobility in crustal fluids. Geochim. Cosmochim. Acta, 2004, 68:2207.,2004. |
| [10] | Yan Z G, Zhang Y W, You L P, Si R, Yan C H. General synthesis and characterization of monocrystalline 1D-nanomaterials of hexagonal and orthorhombic lanthanide orthophosphate hydrate. J. Cryst. Growth, 2004, 262:408.,2004. |
| [11] | Patra C R, Alexandra G, Patra S, Jacob D S, Gedanker A, Landau A, Gofer Y. Microwave approach for the synthesis of rhabdophane-type lanthanide orthophosphate(Ln=La, Ce, Nd, Sm, Eu, Gd and Tb)nanorods under solvothermal conditions. New J. Chem., 2005, 29:733.,2005. |
| [12] | Guan H M, Zhang Y J. Hydrothermal synthesis and char-acterization of hexagonal and monoclinic neodymium or-thophosphate single-crystal nanowires. J. Solid State Chem., 2004, 177:781.,2004. |
| [13] | Wang Y Z, Li J, Wang J Y, Han S J, Guo Y J. Flux growth and characterizations of NdPO4 single crystals. J. Cryst. Growth, 2010, 312:2779.,2010. |
| [14] | Gruber J B, Sardar D K, Allik T H, Zandi B. Spectra and energy levels of Nd3+(4f3)in stoichiometric NdP5O14. Opt. Mater., 2004, 27:351.,2004. |
| [15] | Nakano J, Yamada T, Miyazawa S. Top-seeded flux grown of LiNdP4O12 single crystals. J. Cryst. Growth, 1979, 47:693.,1979. |
| [16] | Nixon G J, Lingavay L S, Jasman R H. Properties of close-coupled, monolithic lithium neodymium tetraphosphate laser. SPIE Proc., 1989, 1104:107.,1989. |
| [17] | Chin S R, Hong H Y P. CW laser action in acentric NdAl3 (BO3)4 and KNdP4O12. Opt. Commun., 1976, 15:345.,1976. |
| [18] | Wong P S, Wan M H, Hussin R, Lintang H O, Endud S. Structural and luminescence studies of europium ions in lithium aluminium borophosphate glasses. J. Rare Earths, 2014, 32:585.,2014. |
| [19] | Jerbi H, Hidouri M, Ben Amara M. Synthesis and struc-tural characterization of new yttrium phosphate:Na2.5Y0.5Mg7(PO4)6 with fillowite-like structure. J. Rare Earths, 2010, 28:481.,2010. |
| [20] | Anfimova T, Li Q, Jenson J O, Bjerrum N J. Thermal sta-bility and proton conductivity of rare earth orthophosphate hydrates. Int. J. Electrochem. Sci., 2014, 9:2285.,2014. |
| [21] | Hazel A, Ross S D. Forbidden transitions in the infrared spectra of tetrahedral anions-III. Spectra-structure corre-lations in perchlorates, sulphates and phosphates of the formula MXO4, Spectrochim. Acta, 1966, 22:1949.,1966. |
| [22] | Ramteke D D, Annapurna K, Deshpande V K, Gedam R S. Effect of Nd3+on spectroscopic properties of lithium bo-rate glasses. J. Rare Earths, 2014, 32:1148.,2014. |
| [23] | Tauc J. Amorphous and Liquid Semiconductors. New York:Plenum, 1974.,1974. |
| [24] | Sharma Y K, Mathur S C, Dube D C, Tandon S P. Elec-trical and optical band gap studies in neodymium boro-phosphate glass. J. Mater. Sci., 1996, 15:1054.,1996. |
| [25] | Prasad K. Diffuse phase transition in perovskiteferroelectrics. Indian J. Eng. Mater. Sci., 2000, 7:446.,2000. |
| [26] | Schmidt G. Diffuse phase transition. Ferroelectrics, 1988, 78:99.,1988. |
| [27] | Maxwell J C. Electricity and Magnetism, Vol I. London:Oxford University Press, 1873. 828. |
| [28] | Dutta A, Sinha T P. Structural and dielectric properties of A(Fe1/2Ta1/2)O3 【A=Ba, Sr, Ca】. Mater. Res. Bull., 2011, 46:518.,2011. |
| [29] | Choudhary R N P, Choudhary B K. Structural and dielec-tric studies of GdAsO4. J. Mater. Sci. Lett., 1990, 9:394.,1990. |
| [30] | Hangloo V, Tickoo R, Bamzai K K, Kotru P N. Dielectric characteristics of mixed Gd-Ba molybdate crystals grown at ambient temperatures by the gel encapsulation technique. Mater. Chem. Phys., 2003, 81:152.,2003. |
| [31] | Pandita S, Tickoo R, Bamzai K K, Kotru P N. Dielectric characteristics of gel grown mixed rare earth(didymium)heptamolybdate crystals. Mater. Sci. Eng. B, 2001, 87:122.,2001. |
| [32] | Elliot S R. A.C conduction in amorphous chalcogenide and pnictide semiconductors. Adv. Phys., 1987, 36:135.,1987. |
| [33] | Molak A, Talik E, Kruczek, Plauch M, Ratuszna A, Ujma Z. Characterization of Pb(Mn1/3Nb2/3)O3 ceramics by SEM, XRD, XPS and dielectrics permittivity test. Mater. Sci. Eng. B, 2006, 128:16.,2006. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%