High-Resolution Transmission Electron Microscopy Studies of Sol–Gel-Derived Cobalt-Substituted Barium Ferrite

Teh, Geok Bee; Jefferson, D. A.

doi:10.1006/jssc.2002.9659

Cited by 39 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a manner similar to the Jahn-Teller effect, the elongated distortion perturbed by doping is affected by the interaction of degenerate neighbouring holes. This is in agreement with the fact that doping changes the c-axis but not the a-axis length [33]. The increase in lattice parameter is shown in Table 1 for Co-Mn-Sn doping but was also noted for doping with Mn-Co-Zr [20], Mn-Cu-Zr [19], and Mn-Co, Co-Ti.…”

Section: Anisotropy and Dopingsupporting

confidence: 85%

Preparation and magnetic properties of barium ferrites substituted with manganese, cobalt, and tin

Liu

Drew

Liu

2011

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

Section: Anisotropy and Dopingsupporting

confidence: 85%

Preparation and magnetic properties of barium ferrites substituted with manganese, cobalt, and tin

Liu

Drew

Liu

2011

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

“…It is found that X=1.2 was the optimal parameters for LTCC inductor fabrication after compared the influences of different Co-Ti substitution on the magnetic and electronic performances [6].…”

Section: Methodsmentioning

confidence: 99%

A new embedded helix-type inductor using LTCC technology for high frequency applications

Liu

2009

2009 International Conference on Electronic Packaging Technology &Amp; High Density Packaging

View full text Add to dashboard Cite

A chip inductor based on the CoTi-substituted hexa ferrite BaFe 12 O 19 was designed by LTCC technology to realize the 0805 size of standard packaging and high frequency applications. Testing results show that the value of inductor is 2.45 µH and cut-off frequency is 508 MHz. And the measured results agree with the simulated data basically, which indicates that the samples can satisfy the need of high frequency inductors. The influences of each factor on the performances of inductor were also analyzed. It is an effective method to resolve the consistency problems between simulation and manufacture. IntroductionBecause of the rapid progress in the developments of wireless and mobile technology, further miniaturized inductor operating on higher frequencies are in great demand to fabricate high-density integrated devices. It is generally accepted that low-temperature Co-fired Ceramics and Ferrites (LTCC<CF) technology can satisfy such requirements. In addition, it also can be applied to manufacture other passive components , for example, resistors and capacitors. Thus, Nowadays LTCC is becoming the major technology for components integration [1][2].Recently, M-type barium ferrite (BaFe 12 O 19 ) has been found extensive applications in the fields of permanent magnets, wave-adsorbing, high-density magnetic recording and microwave devices. As the sintering temperature for the material is always higher than 1000ºC and could not be satisfied with chip components manufacturing technology, low-temperature co-fired ceramics and ferrites process, the problems of how to realize the low-temperature firing and multifunction of barium ferrite are becoming the key technologies for the adaption to the developments of electronic components to the directions of subminiaturization, greater multifunctionality and excellent reliability [3][4][5].In this paper, an embedded helix-type LTCC inductor prepared by Co-Ti substituted M-type Barium ferrite for high frequencies applications is described in details. Firstly, The influences of the Co-Ti substitution on the magnetic and electronic performances of barium ferrites are included, in order to find the optimal parameters for LTCC inductor fabrication. Secondly, according to the stimulation results of the inductor used in high frequency by the aid of HFSS software, the structure and the related size of the inductor are confirmed. Thirdly, a helix-type LTCC inductor with the 0805 size was successfully fabricated. Testing results show that the value of inductor is 2.45uH and cut-off frequency is 508MHz. The measured results agree with the simulated data

show abstract

“…The fine particles of cationic substituted BaM are widely anticipated to be a suitable candidate for high-density perpendicular and magneto-optical recording in the near future [1]. High magnetic polarisation J and adequately low coercivity H c is required for these materials.…”

Section: Introductionmentioning

confidence: 99%

Magneto-crystalline properties of BaFe12−2x M x Sn x O19 (M = Sn, Ni, Zn) ferrite powders

et al. 2006

View full text Add to dashboard Cite

BaFe 12−2x M x Sn x O 19 compounds, where M=Sn 2+ , Ni 2+ or Zn 2+ ions, were synthesized by mechanical milling and partially by citrate precursor methods. Analysis of magneto-crystalline structure has been carried out by Mössbauer spectroscopy. The Sn 4+ ions replace Fe 3+ ions on 2b and slightly on 2a+4f 1 sites, Zn 2+ ions strongly prefer 4f 1 sites, Sn 2+ ions prefer 4f 1 sites too and Ni 2+ ions occupy 4f 2 and 12k or 2a sites. The magnetic properties were evaluated by the vibrating sample magnetometry and the thermomagnetic analysis. A large variation of the intrinsic coercivity H c (330 to 78 kA/m) and of temperature coefficient of coercivity of ΔH c /Δϑ (0.39 to 0.22 kA/m°C) were achieved as a function of the (Zn-Sn) and (Sn-Sn) substitutions, respectively. The Curie temperature T c decreased with the (Ni-Sn) substitution from 447 to 399°C.

show abstract

High-Resolution Transmission Electron Microscopy Studies of Sol–Gel-Derived Cobalt-Substituted Barium Ferrite

Cited by 39 publications

References 10 publications

Preparation and magnetic properties of barium ferrites substituted with manganese, cobalt, and tin

Preparation and magnetic properties of barium ferrites substituted with manganese, cobalt, and tin

A new embedded helix-type inductor using LTCC technology for high frequency applications

Magneto-crystalline properties of BaFe12−2x M x Sn x O19 (M = Sn, Ni, Zn) ferrite powders

Contact Info

Product

Resources

About