مرکز منطقه ای اطلاع رساني علوم و فناوري - Magnetization, Magnetoelectric Effect, and Structure Transition in <formula formulatype="inline"> <img src="/images/tex/19603.gif" alt="\\hbox {BiFeO}_{3}"> </formula> and <formula formulatype="inline"> <img src="/images/tex/19604.gif" alt="(\\hbox {Bi}

Title :

Magnetization, Magnetoelectric Effect, and Structure Transition in $\\hbox {BiFeO}_{3}$ and $(\\hbox {Bi}_{</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Author : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>Ding, Y. ; Wang, T.-H. ; Yang, W.C. ; Lin, T.-C. ; Tu, C.S. ; Yao, Y.D. ; Wu, K.T.</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Volume : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>47</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Issue : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>3</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>fYear : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>2011</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>fDate : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>3/1/2011 12:00:00 AM</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Firstpage : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>513</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Lastpage : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>516</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Abstract : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>Magnetization, grain size, x-ray diffraction, and dielectric permittivity of BiFeO<sub>3</sub> (BFO) and 5 mol% lanthanum-substitution BFO [(Bi<sub>0.9</sub>BLa<sub>0.05</sub>)FeO<sub>3</sub>] ceramics have been carried out as a function of sintering temperature (910-950°C) BFO ceramic exhibits an antiferromagnetic behavior, whose magnetization curve is linear with the field at room temperature. A weak ferromagnetic behavior occurs in (Bi<sub>0.9</sub>BLa<sub>0.05</sub>)FeO<sub>3</sub> (BLFO) ceramics at room temperature, in which remanent magnetization increases from 0.008 to 0.14 as sintering temperature raises from 910 to 950°C. This phenomenon can be correlated with the growth of grain size of BLFO ceramics, which grows with increasing sintering temperature. The dielectric permittivities of BFO and BLFO are about 33 and 57 at room temperature, respectively. The dielectric losses (tan δ) of BFO and BLFO ceramics vary respectively in the ranges of ~0.2-0.4 and ~0.002-0.004 below 150°C, indicating that 5 mol% La-substitution can efficiently reduce electric conductivity. A frequency-dependent and broad dielectric maximum was observed in both BFO and BLFO ceramics upon heating. This dielectric response is likely triggered by the antiferromagnetic-paramagnetic transition near the Neel temperature.</div> </div> <div class='row'> <div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Keywords : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>Neel temperature; X-ray diffraction; antiferromagnetic materials; bismuth compounds; ceramics; chemical exchanges; dielectric losses; electrical conductivity; ferromagnetic materials; grain size; heat treatment; lanthanum compounds; magnetoelectric effects; multiferroics; paramagnetic-antiferromagnetic transitions; permittivity; remanence; sintering; solid-state phase transformations; (Bi<sub>0.95</sub>La<sub>0.05</sub>)FeO<sub>3</sub>; BiFeO<sub>3</sub>; Neel temperature; X-ray diffraction; antiferromagnetic behavior; antiferromagnetic-paramagnetic transition; dielectric losses; dielectric permittivity; dielectric response; electric conductivity; ferromagnetic behavior; grain size; heating; lanthanum-substitution; magnetization; magnetization curve; magnetoelectric effect; multiferroic ceramics; remanent magnetization; sintering temperature; structure transition; temperature 293 K to 298 K; temperature 910 degC to 950 degC; <formula formulatype=$ $({rm Bi}_{0.95}{rm La}_{0.05}){rm FeO}_{3}$ ; ${rm BiFeO}_{3}$; X-ray diffraction; dielectric permittivity; grain size; magnetization;