功能材料与器件学报
功能材料與器件學報
공능재료여기건학보
JOURNAL OF FUNCTIONAL MATERIALS AND DEVICES
2001年
1期
16-20
,共5页
贺连星%李承恩%陈廷国%王志勇%晏海学
賀連星%李承恩%陳廷國%王誌勇%晏海學
하련성%리승은%진정국%왕지용%안해학
内耗%PZT陶瓷%氧空位%畴壁
內耗%PZT陶瓷%氧空位%疇壁
내모%PZT도자%양공위%주벽
采用低频倒置扭摆内耗仪对组分为Pb(Zr0.7Ti0.3)O3(PZT73)和Pb(Zr0.3Ti0.7)O3(PZT37)的两种陶瓷的内耗Q-1及振动频率的平方f2(正比于材料的剪切模量G)与温度的关系进行了测定。在纯三角相的PZT73陶瓷中发现两个内耗峰。高温内耗峰PM起源于材料的顺电-铁电相变,低温内耗峰P1本质上是一个宽化的Debye峰,可归因于氧空位作用下的畴壁振荡弛豫。对纯四方相的PZT37陶瓷,除了P1和PM峰外,在P1与PM峰之间另有内耗峰P2,这与900畴附近的氧空位团簇的弛豫有关,其特征可用描述强关联系统的关联态模型(Couplingmodel)描述。
採用低頻倒置扭襬內耗儀對組分為Pb(Zr0.7Ti0.3)O3(PZT73)和Pb(Zr0.3Ti0.7)O3(PZT37)的兩種陶瓷的內耗Q-1及振動頻率的平方f2(正比于材料的剪切模量G)與溫度的關繫進行瞭測定。在純三角相的PZT73陶瓷中髮現兩箇內耗峰。高溫內耗峰PM起源于材料的順電-鐵電相變,低溫內耗峰P1本質上是一箇寬化的Debye峰,可歸因于氧空位作用下的疇壁振盪弛豫。對純四方相的PZT37陶瓷,除瞭P1和PM峰外,在P1與PM峰之間另有內耗峰P2,這與900疇附近的氧空位糰簇的弛豫有關,其特徵可用描述彊關聯繫統的關聯態模型(Couplingmodel)描述。
채용저빈도치뉴파내모의대조분위Pb(Zr0.7Ti0.3)O3(PZT73)화Pb(Zr0.3Ti0.7)O3(PZT37)적량충도자적내모Q-1급진동빈솔적평방f2(정비우재료적전절모량G)여온도적관계진행료측정。재순삼각상적PZT73도자중발현량개내모봉。고온내모봉PM기원우재료적순전-철전상변,저온내모봉P1본질상시일개관화적Debye봉,가귀인우양공위작용하적주벽진탕이예。대순사방상적PZT37도자,제료P1화PM봉외,재P1여PM봉지간령유내모봉P2,저여900주부근적양공위단족적이예유관,기특정가용묘술강관련계통적관련태모형(Couplingmodel)묘술。
The internal friction Q- 1 and the square of vibration frequency f 2(proportional to shear modulus G) were measured as a function of temperature on undoped Pb(Zr0.7Ti0.3)O3 (PZT73) and Pb(Zr0.3Ti0.7) O3 (PZT37) ceramics from 200C to 5000C. Experiments were performed on an inverted torsion pendulum at low frequencies (1~ 5Hz) .Two internal friction peaks were found in pure rhombohedral PZT73 ceramics. The high temperature peak PM, which appears at the Curie temperature, originates from the para- ferroelec-tric phase transition. The low temperature peak P1 is a broadened Debye peak in nature, and it is contri-buted to the oscillation damping of the domain walls locked by the oxygen vacancies. For the pure tetrago-nal PZT37 ceramics, another peak P2,which appears between P1 and PM,can be well described by the coup-ling model. It is thought to be related with the relaxation of oxygen vacancy clusters near the 900 domains.