液相包裹法制备Pb(Mg_(1/3)Nb_(2/3))O_3-CoFe_2O_4磁电耦合材料  

Preparation of Magnetoelectric Powder Pb(Mg_(1/3)Nb_(2/3))O_3-CoFe_2O_4 by Liquid-packing Method

作　　者：李学勇[1] 付亚东[1] 翁履谦[1] 宋申华[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院材料科学学科部,广东深圳518055

出　　处：《材料开发与应用》2006年第4期24-28,共5页Development and Application of Materials

摘　　要：以无机盐Nb2O5、Mg(NO3)2、Pb(NO3)4、Co(NO3)2、Fe2(NO3)3为原料,柠檬酸和EDTA为络合剂,分别制备了Nb5+、Mg2+、Pb2+、Co2+、Fe3+等离子的络合溶液。采用络合法制备了铌酸镁-铁酸钴先驱体(MgNb2O6-CoFe2O4,简称MN-CFO)。此先驱体在1000℃煅烧1h后,得到纯净的MgNb2O6-CoFe2O4固溶体。采用液相包裹法制备了铌镁酸铅-铁酸钴(Pb(Mg1/3Nb2/3)O3-CoFe2O4)先驱体,在1000℃煅烧1h,Pb(Mg1/3Nb2/3)O3-CoFe2O4先驱体分解为具有铁电相Pb(Mg1/3Nb2/3)O3和铁磁相CoFe2O4的复相组织。研究了10%过量的PbO对煅烧过程中烧绿石相向铁电相的转变作用,并在700℃煅烧5h条件下制备了不含烧绿石相的Pb(Mg1/3Nb2/3)O3-CoFe2O4固溶体。Complex solutions of Nb^5＋ ,Mg^2＋ ,Pb^2＋, Co^2＋ and Fe^3＋ were prepared with inorganic Nb2O5, Mg（NO3）2, Pb （NO3）4 ,Co（NO3）2 and Fe2（NO3）3 as raw materials and citric acid and EDTA as complexing agents. The MgNb2O6-CoFe2O4 precursor was made via a complexing method. Pure MgNbxO6-CoFe2O4 solid solution was produced through calcining the precursor for lh at 1000℃. The Pb（Mg1/3Nb2/3）O3-CoFe2O4 precursor was prepared via a liquid-packing method, and the Pb （Mg1/3Nb2/3）O3-CoFe2O4 precursor separated into ferroelectric phase Pb（Mg1/3Nb2/3）O3 and ferromagnetic phase CoFe2O4 when calcined for lh at 1000℃. The effect of 10% excess PbO addition on the phase transformation from pyrochlore to Pb （Mg1/3Nb2/3）O3 was studied. A pyrochlore-free solid solution of Pb（Mg1/3Nb2/3）O3-CoFe2O4 was produced after calcining the precursor for 5h at 700℃.

关 键 词：络合法 液相包裹法 Pb(Mg1/3Nb2/3)O3-CoFe2O4 MgNb2O6-CoFe2O4 烧绿石相 

分 类 号：TG132.27[一般工业技术—材料科学与工程]