BNBMT presses the preparation of electric pottery and porcelain and function research without lead

93Bi0.

5Na0.

5TiO3-0.

System of BNBMT100x) of 07Ba1- XMgxTiO3(abbreviation presses electric pottery and porcelain without lead, right the brilliant look feature of BNBMT pottery and porcelain and its interpose report undertook discussion with the function that suppress report. XRD analysis makes clear, sample of pottery and porcelain all fashioned solid solution of single construction of calcic titanium mine; The affiliation of Mg has distinct effect to the interpose report of pottery and porcelain, function that suppress report; The iron report of pottery and porcelain - suitable report appearance changes the peak is reduced significantly, spreading; Interpose report loss comes in room temperature inside 200 ℃ limits gentlier. When X=0.

04 when, kp of Electromechanical coupling coefficient and Kt are the biggest, it is respectively 16% with 19% , value of D33 of the constant that suppress report is 111pC/N. Keyword: Press electric pottery and porcelain without lead, micromechanism, interpose report function, 1 foreword controls the function that suppress report electric pottery and porcelain develops in recent years very rapid, apply extensively at pressing electric filter, small displacement implement, in the electronic parts such as driver and sensor, important place is had in domain of new and high technology. In the pottery and porcelain suppressing report that uses at present, those who take dominant place is zirconium titanium acerbity lead (PZT) material [1] . The oxidation lead in this material holds raw material gross weight about 70% the left and right sides [2] , and lead is a kind of toxic substance, volatilize very easily in agglomeration process, can cause a harm to environment and human health. Accordingly, the research that presses electric pottery and porcelain without lead and development become one of research heat of domain of the current ferroelectric material that suppress report. Bi0.

5Na0.

5TiO3(NBT) is a kind of A comfort of relax of construction of mine of compound calcic titanium ferroelectric [3] , tc of its Courier temperature is 320 ℃ , very strong ferroelectricity is had below room temperature (C/cm2)[4] of μ of Pr=38 of odd polarization intensity. But the correct dense field of pottery and porcelain of NBT iron report (Ec=73kV/cm) is exorbitant, material is very inaccessible sufficient polarization, acquire the admirable property that suppress report hard consequently. In recent years, people is right NBT radical pressed electric pottery and porcelain to undertake many modified studies, use KTiO3, ATiO3(A=Ba, Sr, Ca) , ANbO3(A=K, Li, Na) , ABO3(A=Bi, La; B=Cr, Fe, Sc, Mn) and BiFeO3 [4~8] and NBT form n duality or multivariate department solid solution, obtained a few have practical change foreground press electric pottery and porcelain without lead [9, 10] . (1-x)Bi0.

5Na0.

5TiO3-xBaTiO3(NBT-BT) pottery and porcelain is in X=0.

06~0.

07 when existence tripartite - all directions is the same as definitely model phase boundary (MPB) , have the good performance that suppress report, be considered as what press electric pottery and porcelain without lead to await one of select material makings accordingly [11~13] . Concerned NBT-BT pottery and porcelain already had a lot of research, but the research that adulterates about Mg is scarcer. This literary grace adulterates with Mg, alignment is the same as model near phase boundary material namely Bi0.

5Na0.

5TiO3-BaTiO3 undertook modified studies adulterating, studied Mg is impure to Bi0.

5Na0.

The micromechanism of sample of 5TiO3- BaTiO3 pottery and porcelain, impact that controls report and interpose report function. 2 experiments this experiment it is raw material in order to analyse 5H2O of pure Bi(NO3)3 · , Mg(NO3)2, NaNO3, Ba(NO3)2 and TiO2. According to chemical type 0.

93Bi0.

5Na0.

5TiO3- 0.

07Ba1-xMgxTiO3(x=0.

02, 0.

04, 0.

06, 0.

08, 0.

The chemistry of 10) is metric deserve to compare have burden. solubility salt kind join solvent to dissolve, make sol, next interfuse of TiO2 pink body, sufficient agitate is dispersive, mix precursory style in order to form. The wear after drying of will precursory body is pulverous, issue pre-burning 3~4h in 850~900 ℃ next, make system of pink of pottery and porcelain. Classics is abrade, squelch powdery body Cheng Houwei 1mm, diameter is the wafer shape base substrate of 20mm, issue agglomeration 2h at 1150~1200 ℃ respectively, form sample of BNBMT pottery and porcelain. After surface of classics of sample of pottery and porcelain grinds smooth polish, tu Shangyin electrode. In placing silicone oil next, heat to 100 ℃ , polarization falls in the dc electric field of 3~5kV/mm, time is 15min. The brilliant look feature of pottery and porcelain determines through analyzer of X- ray diffraction; The dielectric constant that different temperature issues pottery and porcelain (ε R) and interpose report loss (Tan δ ) use bridge of TH2819 LCR exact number to determine; The D33 of the constant that suppress report of pottery and porcelain uses instrument of D33 of ZJ-3A accurate static state to determine; Resistor R) and 1kHz issue the resonance of Zmin(of the smallest impedance when constant of the resonance of pottery and porcelain, antiresonance, Zhen Xie the static capacitance of sample uses instrument of HP4294A accurate impedance to determine, calculate next a Kp of Electromechanical coupling coefficient and Kt and Qm of mechanical quality factor. 3 results and function are analysed 3.

1X=0 of XRD analysis 　 , 0.

02, 0.

04, 0.

The ray of X pink brilliant of the sample of 10 BNBMT pottery and porcelain when is diffractive. Can see, after joining Mg, the sample of pottery and porcelain of 2h of agglomeration of classics 1150~1200 ℃ shows the diffraction of single crystal photograph, the diffractive peak that does not have other brilliant photograph exists, make clear fashioned solid solution, its crystal structure retained trait of construction of calcic titanium mine. Among them (001) and (100) , (002) and (200) , (112) and (211) diffractive peak basically incorporates a diffractive peak, show structure of solid solution crystal has feature of false cubic look. The radius that compares Ba2+ as a result of the radius of Mg2+ is small much, after partial Ba2+ is replaced by Mg2+ , cause brilliant afterbirth bulk to narrow, cause the local distortion of crystal structure thereby. From the point of whole, the difference of A of brilliant afterbirth parameter and C was reduced, crystal structure has the tide that cubic metre turns. Right now, 0.

93Bi0.

5Na0.

5TiO3-0.

Of 07BaTiO3 pottery and porcelain be the same as definitely model phase boundary feature disappears basically, did not see the diffractive feature that has tripartite look. 3.

Different Mg adds the feature of interpose report function of 2 pottery and porcelain the pottery and porcelain of the quantity is opposite dielectric constant (ε R) and interpose report loss (Tan δ ) along with temperature (the metabolic curve of T) . Visible, as the affiliation of Mg, the interpose report function of pottery and porcelain produced marked change. When X=0.

02 when, appear in the 89 ℃ place of ε R-T curve a Jie Dianfeng, in Tan δ - the photograph of T curve also has an unusual peak locally together, make clear right now pottery and porcelain happened to change. This kind of photograph changes is nonexistent in the pottery and porcelain that joining Mg, explain it is as a result of the affiliation of Mg generation. As to happened why to be planted change, still remain to study further. Increase what add a capacity as Mg further, unusual peak of this interpose report disappears. When X>0.

04 when, the interpose report loss of pottery and porcelain comes in room temperature gently metabolic trait is shown inside 200 ℃ limits, reflective pottery and porcelain has stability of good interpose report temperature. The iron report of typical iron report pottery and porcelain - suitable report appearance changes temperature namely Courier temperature (Tc) is in dielectric constant to be able to produce mutation, on ε R-T curve expression is the peak of one acuteness. Knowable, as the addition of Mg content, the Courier dot of pottery and porcelain disappears almost completely, iron report - suitable report appearance changes the peak becomes gently, appear to be reduced significantly with spreading feature, be in especially X=0.

08 when, ε R-T curve is very flat, make clear an intense dispersion photograph to change feature. The temperature Tm with the greatest dielectric constant right now corresponding value is in limits of ℃ of 212 ℃ ~291 changes, show the trend that join the addition of the quantity as Mg and drops. Additional, when X=0.

06 with X=0.

10 when, lift and increase what the dielectric constant of pottery and porcelain follows temperature continuously, still did not appear to 350 ℃ maximum. The interpose report loss of pottery and porcelain also shows similar metabolic trait. Analysis of X ray diffraction makes clear, as the affiliation of Mg, crystal structure produced marked change, x ray diffraction shows the trait of false cubic photograph, put possibly in pottery and porcelain in photograph of brilliant of partial cubic metre actually, namely pottery and porcelain arranges electric appearance composition by appearance of report of all directions iron and cubic metre, this is the A in BaTiO3 the result that Ba2+ is replaced by Mg2+ . As a result of Mg2+ radius (0.

66) compares Ba2+(1.

34) is small, when by Mg2+ and O2- cubic metre of heart of collective composition face piles closely, forms octahedral clearance decrescent, the shift of Ti4+ is difficult, cannot form initiative polarization, in destroying BaTiO3 ferroelectric inside electric field, make crystal local thereby lose ferroelectricity. Introduce the addition of the quantity as Mg, division of the cable that be not iron also increases somewhat, the ferroelectricity of crystal drops gradually, expression is around Tc of ε R peak value be reduced significantly and spreading, character of ε R temperature is even. 3.

The D33 of the constant that suppress report of the pottery and porcelain after the impure modified of Mg of 　 of feature of the function that suppress report of 3 pottery and porcelain and Kp of Electromechanical coupling coefficient, Kt enters the metabolic curve of the quantity along with Mg mix into. Visible,

02~0.

10 limits, join the addition of the quantity as Mg, the D33 value of pottery and porcelain increases somewhat, but be worth with the D33 of BNBT (132pC/N) photograph is compared, whole is reduced. When X=0.

02 when, the D33 of pottery and porcelain drops remarkable, its value is 50pC/N only. But when X=0.

04 when, d33 increases significantly again, amount to 111pC/N. Increase as Mg content continuity, d33 value shows descendent trend again, but in X=0.

04~0.

10 between, the D33 change of pottery and porcelain is not big. The Kp of Electromechanical coupling coefficient of pottery and porcelain and Kt are in X=0.

04 when the biggest, achieve respectively 16% with 19% . Join the addition of the quantity as Mg, kp and Kt tend reduce. Gave out the Qm of Electromechanical quality factor of pottery and porcelain changes along with the curve of Mg content. The Qm value of pottery and porcelain is in X=0.

06 when the biggest, achieve 104, but in X=0.

04 when lowest, it is only 34. CNC Milling