نتایج جستجو برای: single crystals

تعداد نتایج: 913968  

Journal: :Langmuir : the ACS journal of surfaces and colloids 2007
Kazuya Sato Takahiro Sawaguchi Masafumi Sakata Kingo Itaya

Nearly perfect single crystals of pentacene were grown from trichlorobenzene solution. The surface structure of pentacene single crystals has been investigated by frequency modulation atomic force microscopy. Molecularly flat and extraordinarily wide terraces, extended over the width of more than a few micrometers with monomolecular steps, were consistently observed, suggesting that those penta...

Journal: :Progress in materials science 2014
Qifa Zhou Kwok Ho Lam Hairong Zheng Weibao Qiu K Kirk Shung

Piezoelectric single crystals, which have excellent piezoelectric properties, have extensively been employed for various sensors and actuators applications. In this paper, the state-of-art in piezoelectric single crystals for ultrasonic transducer applications is reviewed. Firstly, the basic principles and design considerations of piezoelectric ultrasonic transducers will be addressed. Then, th...

2016
K. K. Uprety J. Horvat Xiaolin Wang G. D. Gu M. Ionescu Hua-Kun Liu S. X. Dou E. H. Brandt X. L. Wang H. K. Liu

Magnetic hysteresis and magnetic relaxation measurements have been performed to study vortex pinning behaviors for pure, Fe doped and heavily Pb doped Bi2212 single crystals. Unlike pure and Fe doped Bi2212 crystals, heavily Pb doped crystal showed strong vortex pinning behavior. We interpret the strong pinning in heavily Pb doped Bi2212 single crystals as arising from the improved Josephson co...

تجبر, ناصر,

Single crystals of CdTe were grown by the sublimation and condensation technique in a silica, under an argon gas now, and also by alloing cadmium tcJloride transport within an evacuated silica ampoule. X-ray powder diffraction patlerns prepared from each group of grown crys tals showed the crystal structure of the examined samples to be zinc-blend race-cent red cubic. Transmission electr...

2009
J.-Q. Yan S. Nandi R. J. McQueeney R. W. McCallum

Millimeter-sized single crystals of LaFeAsO, LaFeAsO1−xFx, and LaFe1−xCoxAsO were grown in NaAs flux at ambient pressure. The detailed growth procedure and crystal characterizations are reported. The as-grown crystals have typical dimensions of3×4×0.05–0.3 mm3 with the crystallographic c-axis perpendicular to the plane of the platelike single crystals. Various characterizations confirmed the hi...

Journal: :Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics 2000
Kyu Mehta Chiu

The spatiotemporal growth of single crystals in a crystalline polymer has been investigated theoretically based on a nonconserved time dependent Ginzburg-Landau equation (known as TDGL model A). In the description of the total free energy, a double-well local free energy density signifying metastability of crystal ordering is combined with a nonlocal free energy term representing an interface g...

Journal: :Journal of applied physics 2013
Enwei Sun Rui Zhang Fengmin Wu Bin Yang Wenwu Cao

Complete sets of elastic, piezoelectric, dielectric, and electromechanical properties of [001]c and [011]c poled pure and 0.5 wt. % manganese-doped 0.24Pb(In1/2Nb1/2)O3-0.47Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 single crystals have been characterized at room temperature. The results indicate that manganese ion substitution in the B-site of perovskite 0.24PIN-0.47PMN-0.29PT single crystals makes the mater...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2014
Hechang Lei Milinda Abeykoon Kefeng Wang Emil S Bozin Hyejin Ryu D Graf J B Warren C Petrovic

We have synthesized K0.95(1)Ni1.86(2)Se2 single crystals. The single crystals contain K and Ni deficiencies not observed in KNi2Se2 polycrystals. Unlike KNi2Se2 polycrystals, the superconductivity is absent in single crystals. The detailed physical property study indicates that the K0.95Ni1.86Se2 single crystals exhibit heavy-fermion-like characteristics. The transition to a heavy fermion state...

Journal: :Science 2014
Letian Dou Yonghao Zheng Xiaoqin Shen Guang Wu Kirk Fields Wan-Ching Hsu Huanping Zhou Yang Yang Fred Wudl

One of the challenges in polymer science has been to prepare large-polymer single crystals. We demonstrate a visible light-triggered quantitative topochemical polymerization reaction based on a conjugated dye molecule. Macroscopic-size, high-quality polymer single crystals are obtained. Polymerization is not limited to single crystals, but can also be achieved in highly concentrated solution or...

Journal: :Journal of applied physics 2009
Yang Xiang Rui Zhang Wenwu Cao

A piezoelectric domain wall model has been developed to analyze the effective piezoelectric properties of domain engineered BaTiO(3) (BT) single crystals with different volume fractions of 90 degrees domain walls. The model takes into account the nonuniform deformation in the domain wall region, which can create additional anisotropy to enhanced functional properties of multidomain single cryst...

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