排序方式: 共有28条查询结果,搜索用时 27 毫秒
1.
Zuyong Feng Haosu LuoYiping Guo Tianhuo HeHaiqing Xu 《Solid State Communications》2003,126(6):347-351
Electric-field-induced strain behavior of (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMNT) crystals with different orientations and compositions was investigated for use as electromechanical actuators. Crystallographically, high strains with low hysteresis were achieved for 〈001〉 oriented rhombohedral crystals (29%≤x≤31%) near a morphotropic phase boundary, rather than 〈110〉 and 〈111〉. Domain instability could explain inferior strain levels and large hysteresis for 〈110〉 and 〈111〉 oriented crystals. Ultrahigh strain levels up to 1.8% could be achieved for 〈001〉 oriented PMNT crystals, being related to an E-field induced phase transition. −2 kV/cm negative E-field can be applied to PMNT ferroelectric material with low hysteresis. High strain with low hysteresis makes PMNT crystals promising candidates for high performance solid-state actuators. 相似文献
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3.
Mael Guennou Maxim Savinov Jan Drahokoupil Haosu Luo Jirka Hlinka 《Applied Physics A: Materials Science & Processing》2014,116(1):225-228
We report a study of properties of Mn-doped NBT-6 %BT single crystals. We show that tetragonal single-domain states can be stabilized by poling along a [001] direction. For carefully prepared crystals, the piezoelectric coefficient \(d_{33}\) can reach 570 pC/N. When poled along non-polar directions, the crystals exhibit ferroelectric domain structures consistent with tetragonal micron-sized domains, as revealed by optical observation and Raman spectroscopy. The multidomain crystals have lower \(d_{33}\) values, 225 and 130 pC/N for [011] and [111]-oriented crystals, respectively. This trend is commented on from a domain-engineering perspective. 相似文献
4.
Energy harvesting using multilayer structure based on 0.71Pb(Mg1/3Nb2/3)O3–0.29PbTiO3 single crystal
Bo Ren Yaoyao Zhang Qinhui Zhang Xiaobing Li Wenning Di Xiangyong Zhao Haosu Luo Siu Wing Or 《Applied Physics A: Materials Science & Processing》2010,100(1):125-128
In this paper we fabricated the multilayer structure used as the resonance-based vibration energy-harvesting device based
on 0.71Pb(Mg1/3Nb2/3)O3–0.29PbTiO3 single crystal. The performances of the device including the output voltage and power were studied systematically. Under
a cyclic force of 4 N (peak value), a high output power of 4.94 mW and a corresponding peak voltage of 3.14 V were measured
at 1.4 kHz with a matching load resistance of 1.0 kΩ. The results demonstrate the potential of the device in energy-harvesting
applied to low-power portable electronics and wireless sensors. 相似文献
5.
Feifei Wang Wangzhou Shi Yanxue Tang Xinman Chen Tao Wang Haosu Luo 《Applied Physics A: Materials Science & Processing》2010,100(4):1231-1236
In present work, a simple longitudinal piezoelectric transformer with the size of 16-mm length, 2-mm width, and 2-mm thickness
was designed and fabricated with relaxor ferroelectric single-crystal (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3. Both the input and output parts utilized the ultrahigh longitudinal extensional electromechanical coupling coefficients.
Compared to the Rosen-type transformer, this transformer has the advantages of smaller-size, simpler structure, no spurious
vibration, and no acoustic mismatch between the input and output parts. The electrical measurement results indicated that
under the resonance frequency of 114 kHz, a step-up voltage of about 30 can be obtained under a 10-MΩ load resistance, which
agreed well with the calculated results. Besides, the frequency and load dependences of this transformer were also systematically
studied and discussed. The results indicated that this transformer has potential applications in the small-size high-voltage
amplifier and magnetoelectric/piezoelectric-transformer composite transducers. 相似文献
6.
The refractive indices of tetragonal (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystals were measured with a prism coupler and their linear electro-optic (EO) properties were investigated from 20 to 80 °C by the automated scanning Sénarmont system with an ac field. The composition and temperature effect on the EO coefficients were also discussed. It has been found that their EO coefficients are much larger than that of widely used LiNbO3 single crystal and the calculated half-wave voltages are also much lower, which enable the operation at lower voltages and the smaller device dimensions. Since the excellent EO properties are very stable and such high quality single crystals with large-size have been obtained, the PMN-xPT single crystals are a very promising candidate for EO modulation applications. By linking to the polarization-related quadratic EO coefficients, we find that the linear EO properties are related with the spontaneous polarization and dielectric constants. 相似文献
7.
Uncooled pyroelectric infrared detectors based on ferroelectric single crystals 0.74Pb(Mg1/3Nb2/3)O3–0.26PbTiO3 (PMN–0.26PT) were fabricated. The performances of pyroelectric detectors dependence on detector fabrication temperature, absorption layer, and element thickness were compared. The room-temperature voltage responsivity (Rv) of 200 V/W and specific detectivity (D*) of 108 cm Hz1/2/W at 12.5 Hz have been achieved. The results reveal that the better pyroelectric response can be expected by controlling temperature below 70 °C during the fabrication of the pyroelectric detectors, selecting absorption layer with high absorption coefficient, and decreasing the thickness of the elements. 相似文献
8.
Wenwei Ge Hong Liu Xiangyong Zhao Xiaobing Li Xiaoming Pan Di Lin Haiqing Xu Xiangping Jiang Haosu Luo 《Applied Physics A: Materials Science & Processing》2009,95(3):761-767
In this paper, a single crystal of 0.96Na0.5Bi0.5TiO3-0.04BaTiO3 with dimensions of Φ 30×10 mm was grown by the top-seeded-solution growth method. X-ray powder diffraction results show that the as-grown crystal
possesses the rhombohedral perovskite-type structure. The dielectric, piezoelectric and electrical conductivity properties
were systematically investigated with 〈001〉, 〈110〉 and 〈111〉 oriented crystal samples. The room-temperature dielectric constants
for the 〈001〉, 〈110〉 and 〈111〉 oriented crystal samples are found to be 650, 740 and 400 at 1 kHz. The (T
m, ε
m) values of the dielectric temperature spectra are almost independent of the crystal orientations; they are (306°C, 3718),
(305°C, 3613) and (307°C, 3600) at 1 kHz for the 〈001〉, 〈110〉 and 〈111〉 oriented crystal. The optimum poling conditions were
obtained by investigating the piezoelectric constants d
33 as a function of poling temperature and poling electric field. For the 〈001〉 and 〈110〉 crystal samples, the maximum d
33 values of 146 and 117 pC/N are obtained when a poling electric field of 3.5 kV/mm and a poling temperature of 80°C were applied
during the poling process. The as-grown 0.96Na0.5Bi0.5TiO3-0.04BaTiO3 crystal possesses a relatively large dc electrical conductivity, especially at higher temperature, having a value of 1.98×10−11 Ω−1⋅m−1 and 3.95×10−9 Ω−1⋅m−1 at 25°C and 150°C for the 〈001〉 oriented crystal sample. 相似文献
9.
The optical transmission spectra from 0.3 to 11 μm of relaxor ferroelectric single crystals (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) were systematically studied at room temperature in this paper. The crystal is transparent between 0.45 and 5.5 μm and becomes completely absorbing around 0.4 μm in near UV region and 10 μm in infrared region. But the wavelength cutoff in near UV is much sharper than the long wavelength cutoff. As compared with other configurations, tetragonal single crystals possess the optimal transmission properties. The optical transmittance in the wavelength region from 0.45 to 5.5 μm is about 70%. The results show that tetragonal PMN-xPT single crystals are promising for a wide range of optical applications. Some discussions about the oxygen-octahedra structure that determines the basic energy level of the crystals are also presented on the optical properties of PMN-xPT single crystals. 相似文献
10.
Yuting Liu Jie Jiao Lingying Li Jiashuai Ma Bo Ren Jianwei Chen Wenning Di Xiangyong Zhao Haosu Luo Ling Shi 《固体物理学:研究快报》2014,8(2):194-197
The nonlinear and linear properties in Metglas/piezofiber magnetoelectric composites under DC bias fields (Hbias) have been investigated via a frequency‐conversion technique. It was found that the major noise near the carrier frequency (fC) is caused by the driven source. Both linear ME coefficient and noise floor near fC (bandwidth of noise measurement is 10 Hz) were dependent on Hbias, while the nonlinear ME coefficient was independent. A high magnetic‐field sensitivity of 40 pT was obtained after optimizing Hbias. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献