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ÀûÓõç×Ó˳´Å¹²Õñ (EPR)·½·¨¶ÔMn²ôÔÓµÄBaTiO3PTCRÌÕ´ÉÔÚ 12 0¡« 45 0KµÄζȷ¶Î§ÄÚ½øÐÐÁËÑо¿ .Ñо¿½á¹û±íÃ÷ :¸ß×ÔÐýMn2 + Àë× 6ÖØÆ×Ï߷dz£Ã÷ÏÔ ±íÕ÷Æ×ÏßλÖõÄgÒò×ÓΪ 2 .0 0 99,Mn2 + Àë×ÓÐźÅÇ¿ÈõÓëBaTiO3 ¾§Ìå½á¹¹ÃÜÇÐÏà¹Ø .Mn2 + Àë×ÓÐźŵÄζȷֲ¼³ÊUÐÍ ,¼´ÔÚÈý·½ÏàºÍÁ¢·½Ïàʱ ,ÐźÅÇ¿¶È½ÏÇ¿ ,¶øÔÚËÄ·½ÏàºÍб·½ÏàʱÐźźÜÈõ .ÕâÊÇÒòΪÔÚËÄ·½ÏàºÍб·½ÏàÖÐ ,ÓÉÓÚBaTiO3 ¾§Ìå½á¹¹µÄŤÇúºÍ»û±ä ,µ¼ÖÂMn2 + ºÍVO ¿ÕλµÞºÏÉú³ÉMn2 + -VO ¸´ºÏȱÏÝ .δ³É¶Ôµç×ÓµÄÏûʧÒÔ¼°¸´ºÏȱÏÝMn2 + -VO µÄÉú³ÉÊÇMn2 + ÔÚËÄ·½ÏàºÍб·½Ïà( 2 0 0¡« 380K)ÏûʧµÄÖ÷Òò .ʵÑéÖÐûÓз¢ÏÖMn3 + ºÍMn4+ µÄÐźŠ,¶øÓëʵÑéµÄ»·¾³Ìõ¼þÒ»Ö .²ôMnºóÑùÆ·CurieµãµÄÆ¯ÒÆ¿ÉÄÜÊÇMn½øÈë¾§¸ñµÄÒ»¸öÅÐ¾Ý .´ËÍâ ,ÓÉÓÚÊÔÑùµÄn(Ba) /n(Ti) =1,Òò¶øÃ»Óз¢ÏÖ±µ¿ÕλVBa¼°ÆäËüµÄ¸´ºÏȱÏÝ (Èç :VBa-Mn2 + ,Mn3 + -VO,La3 + -Mn3 + µÈ ) .Mn2 + Àë×ӵȵç×ÓÏÝÚåµÄÉú...
    Paramagnetic centers in La_doped BaTiO 3 [ n (Ba)¡Ã n (Ti)=1] ceramics added with MnO 2 were measured at 120-450 K by electron paramagnetic resonance (EPR) for investigating the effect of the centers on the positive temperature coefficient of resistivity (PTCR). EPR detected one signal only: an anisotropically£¨¸÷ÏòÒìÐÔ£© broad singlet signal at g =2.009 9, a sextet signal due to Mn 2+ . And Mn 2+ ion signal was distributed with temperatures in an U_shape, that is, two signals arised in the rhombohedra...
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Article Name
Ó¢ÎÄ(Ó¢Óï)·­Òë ELECTRON PARAMAGNETIC RESONANCE OF Mn-DOPED BaTiO_3 PTCR CERAMICS;
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Author Tang Zilong 1;Tang Xiaofeng 1;Zhou Zhigang 1;Li Yong 2 £¨1. State Key Laboratory of New Ceramics and Fine Processing;Department of Materials Science and Engineering;Tsinghua University;2. Department of Chemistry;Beijing;
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Author Agencies ÐÂÐÍÌÕ´ÉÓ뾫ϸ¹¤ÒÕ¹ú¼ÒÖØµãʵÑéÊÒ; Ç廪´óѧ»¯Ñ§Ïµ Ç廪´óѧ²ÄÁÏ¿ÆÑ§Ó빤³Ìϵ; Ç廪´óѧ²ÄÁÏ¿ÆÑ§Ó빤³Ìϵ;  
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Article From ¹èËáÑÎѧ±¨;Journal of The Chinese Ceramic Society;2002Äê 01ÆÚ;

[ Last edited by wpq113 on 2009-4-21 at 22:41 ]
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