Ion Jump Lengths Of MN-ZN-AL-FE And MG-ZN-CR-FE Nano-particles

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1 Inian Streams Research Journal Volume, Issue. 8, Sept 01 ISSN: ORIGINARTICLE Available online at Ion Jump Lengths Of MN-ZN-AL-FE An MG-ZN-CR-FE Nano-particles S. J. Haralkar, S. S. More, Sagar E. Shirsath, R. H. Kaam, D. R. Mane 1 Department of Physics, Kulswamini College, Tuljapur, Osmanaba MS, Inia Department of Physics, Yashwantrao Chavan Mahaviyalaya, Tuljapur, Osmanaba MS, Inia 3 Spin Device Technology Center, Faculty of Engineering, Shinshu University, Nagano , Japan. 4 Materials Research Laboratory, Srikrishna Mahaviyalaya Gunjoti, Omerga, Osmanaba: MS, Inia. 5 Dr. Babasaheb Ambekar Marathwaa University, Aurangaba MS, Inia. Abstract: Al substitute Mn-Zn-Fe with a chemical formula Mn0.5Zn0.5AlxFe-xO 4 an Cr substitute Mg-Zn-Fe with a chemical formula Mg0.5Zn0.5CrxFe-xO 4 were synthesize by sol-gel auto-combustion metho. The samples were obtaine by annealing at relatively low temperature at 600 ºC an characterize by X-ray iffraction (XRD). Lattice constant is ecrease in both the system with the increasing substitution of Al an Cr ions. Ion jump length foun to ecrease with the increase of Al in Mn-Zn- Fe, similar results were observe for Cr substitute Mg-Zn-Fe. All the allie parameters such as tetraheral bon (AX), octaheral bon (BX), tetra ege (AXE) an octaheral ege (BXE) shows ecreasing tren in both the Mn-Zn-Al-Fe an Mg- Zn-Cr-Fe systems. KEYWORDS: Ferrites; Sol-gel metho, Ion jump length. 1.INTRODUCTION Soft ferrites are wiely use in electronic equipment, an recently, the eman for highly inuctive materials has increase so as to lower prices. MgZn ferrite is use in large quantities because it is highly cost effective. In general, copper an manganese oxies are ae to MgZn ferrites in orer to achieve high quality [1-3]. The parameters relate to the ionic charge an raius, crystal fiels play an important role in the site preference of the cations. The effect of Cr substitution for Fe in spinel ferrites has been stuie extensively [4-6]. Though there is no reports are foun to us in which Cr is substitute in Mg-Zn ferrite. The Mn-Zn ferrites are preferre over other ferrites because of their high initial permeability, low losses, high saturation magnetization an relatively high Curie temperature [7]. These ceramics have spinel x 1-x structure base on a face-centere cubic lattice of oxygen ions with functional units of (Zn Fe )[Mn 1- xfe 1+x]O4 [8]. Mn-Zn ferrites have ifferent behaviors of saturation magnetization; the aition of nonmagnetic zinc ferrite to the inverse spinel manganese ferrite raises the saturation magnetization. Leaing to this non-magnetic substitution it coul be interesting to see the effect of Al ions in Mn-Zn ferrite. The aim of the present research report is to stuy the effect of Cr an Al substitution for Fe on Please cite this Article as : S. J. Haralkar, S. S. More, Sagar E. Shirsath, R. H. Kaam, D. R. Mane, Ion Jump Lengths Of MN-ZN-AL-FE An MG-ZN-CR-FE Nano-particles : Inian Streams Research Journal (Sept. ; 01)

2 the ion jump length an allie parameters of the Mg Zn Cr Fe O an Mn Zn Al Fe O spinel system x -x x -x 4.EXPERIMENTAL PROCEDURE The Analytical grae citric aci (C H O H O), manganese nitrate (Mn(NO ) 6H O), zinc nitrate (Zn(NO ) 6H O), aluminum nitrate (Al(NO ) 9H O) an iron nitrate (Fe(NO ) 9H O) were use to synthesize the Mn Zn AlxFe O (x = ) samples by sol-gel auto combustion metho. A series of x 4 Mg-Zn ferrite substitute by Cr, Mg Zn Cr Fe O (x = ) were prepare using the sol-gel auto x -x 4 combustion metho, in which high purity nitrates of A.R. grae citric aci (C H O H O), magnesium nitrate (Mg(NO ) 6H O), zinc nitrate (Zn(NO ) 6H O), chromium nitrate (Cr(NO ) 9H O) an iron nitrate (Fe(NO ) 9H O) were use. 3 3 The weighe amounts of these metal nitrates were completely issolve in istille water an the solution was stirre for half an hour. This solution was then ae to citric aci in such a way that in the final sample, the molar ratio these nitrates an citric aci become 1:3. A small amount of ammonia was ropwise ae to achieve ph of the solution 7 with stirring the solution simultaneously. The etail of sol-gel synthesis metho was reporte in our previous reports [9-11]. Using Cu-Kraiations with wavelength Å, X-ray iffraction investigations was analyze at room temperature to confirm the crystallographic phase formation of nanocrystalline ferrite material. 3.RESULTS AND DISCUSSION Figure 1 shows the X-ray iffraction (XRD) patterns of the typical samples of Mg-Zn-Cr-Fe an Mn-Zn-Al-Fe (x = 0.). Intensity (arb. unit) (0) (310) () (400) (4) (511) (311) (400) (533) Mg-Zn-Cr-Fe (egree) Mn-Zn-Al-Fe Figure 1. The XRD pattern of the typical samples (x = 0.) of Mg-Zn-Cr-Fe an Mn-Zn-Al-Fe The X-ray iffraction stuy has reveale the crystal structure to be cubic. The XRD pattern of the typical samples, showing well-efine reflections without any ambiguity, exhibits the formation of Mg0.5Zn0.5CrxFe-xO 4 an Mn0.5Zn0.5AlxFe-xO 4. The broa nature of the XRD shows the synthesize samples are in nanometer imensions. The lattice parameter was calculate using the following equation [1], h k l a sin where (hkl) are the Miller inices an is the iffraction angle corresponing to the (hkl) plane. Inian Streams Research Journal Volume Issue 8 Sept 01

3 3 It is observe that the unit cell parameter of the Al substitute Mn-Zn ferrite phase graually ecreases from to Å with increasing Al substitution in the composition obeying Vegar's law. The slow linear ecreasing tren in the lattice parameter is attribute to the replacement of Fe (0.67 Å) ion by Al, a smaller ion with the ionic raii of 0.51 Å. Similarly, lattice constant also ecrease from 8.41 to Å with the increase in Cr content x. The ecrease in the lattice constant is relate to the ifference in ionic raii of Fe an Cr. In the present ferrite system Fe ions (0.67Å) ions are replace by the relatively small Cr ions (0.64Å). Using the values of lattice constant, the istance between magnetic ions (jump lengths) available in tetraheral A-site an octaheral B-site i.e. 'LA' an 'LB' respectively was calculate by using the relations, LA = 3 /4 () LB = /4 (3) Figs. 3 an 4 shows the relation between the hopping lengths in octaheral (A) an tetraheral [B] sites Cr content x Figure : Variation of hopping lengths (LA an LB) with Cr content x. Hopping length LA an LB of Mg Zn Cr Fe O x -x 4 Comp. x Table 1 Hopping length The variation of ion jump lengths (LA an LB) as a function of Al an Cr content 'x' is shown in Inian Streams Research Journal Volume Issue 8 Sept 01

4 4 Figs. an 3 an the values are given in table 1 an, which shows that ion jump lengths ecrease with the increases in Al an Cr content. The results can be explaine by the variation in the lattice constant with increasing Al an Cr content Al content x Figure 3: Variation of hopping lengths (LA an L B) with Al content x. Hopping length LA an LB of Mn Zn Al Fe O x -x 4 Table Comp. Hopping length x The bon length of tetraheral A-site an octaheral B-site i.e. shortest istance between site cations an oxygen ions along with tetraheral ege, share an unshare octaheral ege, are calculate using the formulae given below [13] by inserting the values of lattice constant an oxygen position parameter in to these formulas. Inian Streams Research Journal Volume Issue 8 Sept 01

5 5 1 AX a 3 u (4) BX a 3u u (5) AE a u (6) BEshaire 1u a (7) 1 11 BEunshaire a4u 3u (8) 16 The variations of these structurally important parameters are shown in the Figs. 4 an A XE Allie paramters B X E B X E unshare Share B X A X Cr concentration 'x' Figure 4. Allie parameters with concentration 'x' for Mg Zn Cr Fe O x -x 4 It can be observe from Figs. 4 an 5 that the tetraheral bon ( AX), octaheral bon ( BX), tetra ege ( AXE) an octaheral ege ( BXE) in both the ferrite systems are ecrease with increase in Al an Cr substitution. Figs. 4 an 5 inicates that the tetraheral an octaheral bon lengths ecreases as Al an Cr ion substitution increases. The tetraheral ege an share an unshare octaheral eges ecrease as Al an Cr content increases. This tren coul be relate to the smaller raius of Al an Cr ions compare to Fe ions. Inian Streams Research Journal Volume Issue 8 Sept 01

6 6 3. AXE Allie paramters B XE unshare BXE Share BX AX Al Concentration 'x' Figure 6. Allie parameters with concentration 'x' for Mn Zn Al Fe O x -x 4 4.CONCLUSIONS Mn0.5Zn0.5AlxFe-xO 4 an Mg0.5Zn0.5CrxFe-xO4 were successfully synthesize by sol-gel metho. Lattice constant is ecrease with increasing Al an Cr substitution. Ion jump lengths are ecrease with increasing Al an Cr substitution, which suggests that the length between the magnetic particles of the constituent ions in the respective systems is ecreases. Allie parameters are also shows similar tren to that of lattice constant suggesting the strong relation of its variation with ionic raii of the substitute ion. REFERENCES [1] G. Joshi, S. Deshpane, A. Khot, S. Sawant, In. J Phys. A61 (1987) 51. [] S. Sawant an R. Patil, J Mater. Sci. 16 (1981) [3] M. El Hiti, A. El Shora, S. Hamma, Mater. Sci. Technol. 14 (1998) 65. [4] A.M. El-Saye, Mater. Chem. Phys. 8 (003) 583. [5]A. A. Birajar, Sagar E. Shirsath, R. H. Kaam, S. M. Patange, D. R. Mane, A. R. Shitre, Ceram. Intern. 38 (01) 963. [6]D. R. Mane, Swati Patil, D. D. Birajar, A. B. Kaam, Sagar E. Shirsath, R. H. Kaam, Mater. Chem. Phys. 16 (011) 755. [7]C.F. Zhang, X.C. Zhong, Y.H. Yu, Z.W. Liu, D.C. Zeng, Physica B 404 (009) [8]C. Rath, S. Anan, R.P. Das, K.K. Sahu, S.D. Kulkarni, S.K. Date, N.C. Mishra, J. Appl. Phys. 91 (00) [9]B. G. Toksha, Sagar E. Shirsath, M. L. Mane, S. M. Patange, S. S. Jahav, an K. M. Jahav, J. Phys. Chem. C, 115 (011) [10]D. R. Mane, D. D. Birajar, Swati Patil, Sagar E. Shirsath, an R. H. Kaam, J. Sol-Gel Sci. Technol. 58 (011) 70. [11]A.A. Birajar, Sagar E. Shirsath, R.H. Kaam, S.M. Patange, K.S. Lohar, D.R. Mane, an A.R. Shitre, J. Alloy. Comp. 51 (01) 316. [1]B. D. Cullity, Elements of X-ray iffraction, (Aison-Wesley, Lonon, 1959) [13]Santosh S Jahav, Sagar E. Shirsath, B. G. Toksha, S. M. Patange, S. J. Shukla, K. M. Jahav, Inter. J. Mo. Phys. B 3 (30) (009) Inian Streams Research Journal Volume Issue 8 Sept 01