2004
DOI: 10.1007/bf02705264
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Far-infrared spectral studies of magnesium and aluminum co-substituted lithium ferrites

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Cited by 29 publications
(12 citation statements)
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“…[13,14] are consistent with those given in [12], it should be stressed that the compositional formulas of the materials investigated in both studies indicate the presence of O 2À vacancies or Al 3+ impurities that lead to defect structures that are completely different from the one expected for Li 0.5À0.5x Mg x Fe 2.5À0.5x O 4 which is the material of interest in this work. While the conflicting experimental reports on the magnetisation of Li 0.5À0.5x Mg x Fe 2.5À0.5x O 4 and the relative intensities (areas) of Mö ssbauer spectral components due to Fe 3+ in the A-and B-sites [9,12] could reflect inaccurate measurements or Mö ssbauer fitting schemes, they could really be genuine reflecting a complex microstructure.…”
Section: Introductionsupporting
confidence: 61%
See 1 more Smart Citation
“…[13,14] are consistent with those given in [12], it should be stressed that the compositional formulas of the materials investigated in both studies indicate the presence of O 2À vacancies or Al 3+ impurities that lead to defect structures that are completely different from the one expected for Li 0.5À0.5x Mg x Fe 2.5À0.5x O 4 which is the material of interest in this work. While the conflicting experimental reports on the magnetisation of Li 0.5À0.5x Mg x Fe 2.5À0.5x O 4 and the relative intensities (areas) of Mö ssbauer spectral components due to Fe 3+ in the A-and B-sites [9,12] could reflect inaccurate measurements or Mö ssbauer fitting schemes, they could really be genuine reflecting a complex microstructure.…”
Section: Introductionsupporting
confidence: 61%
“…At temperatures above 735-755 8C the materials crystallizes in the b-phase which has a similar structure to the a-phase except that the Li + and Fe 3+ ions are randomly distributed over the octahedral B-interstices and the space group is Fd3m [6,7]. The material is extensively studied due to its technologically desirable electric and magnetic properties that are susceptible to modification by introducing suitable cationic substitutes for the Fe 3+ ions at the A-or/and B-sub-lattice and/or by controlling the preparative conditions [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. For instance, as the magnetic moments on the A-and B-sites are antiparallel with the dominant contribution to net magnetisation coming from the Fe 3+ at the octahedral B-sites according to the Né el's collinear model of ferrimagnetism, the magnetic properties of Li 0.5 Fe 2.5 O 4 can be modified by substituting Fe 3+ ions by different magnetic/diamagnetic ions on either or both of the A-and Bsublattices, thus allowing the magnetisation to be tailored for specific applications of the ferrite [1,4,5].…”
Section: Introductionmentioning
confidence: 99%
“…For the spinel ferrite system, elastic constant and the Debye temperature can be calculated using IR data using the relation discussed elsewhere [13,14]. The stiffness constant C 11 was calculated using the following relation [15]:…”
Section: Elastic Propertiesmentioning
confidence: 99%
“…[23] The shifting of primary absorption bands towards lower frequency with increasing In 3C ions is attributed to increase in unit cell dimensions and substitution of larger In 3C for Fe 3C in the system. [24] Further, the redistribution of cations on account of nanoscale nature of particles and the increased covalent character of the spinel ferrites due to increased incorporation of In 3C ions caused the observed variation in the intensity and the peak positions of absorption bands. The position of absorption bands and their shift with variation in composition reveals distortion of bonds due to the behavior of neighboring ions of a particular site.…”
Section: Characterizationmentioning
confidence: 97%