物理学进展
物理學進展
물이학진전
PROGRESS IN PHYSICS
2006年
3期
378-385
,共8页
严锋%包鹏%朱劲松%王业宁
嚴鋒%包鵬%硃勁鬆%王業寧
엄봉%포붕%주경송%왕업저
(1-x％)Pb(Mg1/3Nb2/3)O3-x％PbTiO3陶瓷%内耗与模量%微畴弛豫%微畴冻结
(1-x％)Pb(Mg1/3Nb2/3)O3-x％PbTiO3陶瓷%內耗與模量%微疇弛豫%微疇凍結
(1-x％)Pb(Mg1/3Nb2/3)O3-x％PbTiO3도자%내모여모량%미주이예%미주동결
(1-x％)Pb(Mg1/3Nb2/3)O3-x％PbTiO3 ceramics%internal friction and modulus%relaxation of nano-domains%freezing of nano-domains
内耗测量被证明是研究弛豫铁电体中相变的有效方法之一.我们研究了弛豫铁电陶瓷 (1-x%)Pb(Mg1/3Nb2/3)O3-x%PbTiO3 (PMNTx), (0＜x＜33)在低频(0.1 Hz至10Hz)和音频(1 kHz)的内耗.实验表明在铁电微畴的冻结温度出现了一个相变内耗峰和模量的软化,并且随作PbTiO3含量的增加相变逐渐增强,该相变与微畴冻结之间的关系还需作进一步的研究.同时我们还测量到了铁电纳米微畴的反转引起的力学响应,这与其介电响应结果是一致的.
內耗測量被證明是研究弛豫鐵電體中相變的有效方法之一.我們研究瞭弛豫鐵電陶瓷 (1-x%)Pb(Mg1/3Nb2/3)O3-x%PbTiO3 (PMNTx), (0＜x＜33)在低頻(0.1 Hz至10Hz)和音頻(1 kHz)的內耗.實驗錶明在鐵電微疇的凍結溫度齣現瞭一箇相變內耗峰和模量的軟化,併且隨作PbTiO3含量的增加相變逐漸增彊,該相變與微疇凍結之間的關繫還需作進一步的研究.同時我們還測量到瞭鐵電納米微疇的反轉引起的力學響應,這與其介電響應結果是一緻的.
내모측량피증명시연구이예철전체중상변적유효방법지일.아문연구료이예철전도자 (1-x%)Pb(Mg1/3Nb2/3)O3-x%PbTiO3 (PMNTx), (0＜x＜33)재저빈(0.1 Hz지10Hz)화음빈(1 kHz)적내모.실험표명재철전미주적동결온도출현료일개상변내모봉화모량적연화,병차수작PbTiO3함량적증가상변축점증강,해상변여미주동결지간적관계환수작진일보적연구.동시아문환측량도료철전납미미주적반전인기적역학향응,저여기개전향응결과시일치적.
We have found internal friction measurement is very sensitive to phase transitions in relaxor ferroelectrics. Internal friction of relaxor ceramics (1-x%)Pb(Mg1/3Nb2/3)O3-x%PbTiO3 (PMNTx), (0＜x＜33) at both low frequency (0.1～10 Hz) and sonic frequency (1 kHz) has been studied, which clearly exhibits a phase transition close to the freezing temperature of nano-domains. The internal friction peak due to the phase transition shows increasing peak height with the increase of PbTiO3 content. Mechanical response induced by the relaxation of nano-domains has been observed as well, which is consistent with dielectric measurements.
