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1.
High density Al2O3/TaN-based metal--insulator-- metal capacitors in application to radio frequency integrated circuits
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Metal-insulator-metal (MIM) capacitors with atomic-layer-deposited Al2O3 dielectric and reactively sputtered TaN electrodes in application to radio frequency integrated circuits have been characterized electrically. The capacitors exhibit a high density of about 6.05 fF/μm^2, a small leakage current of 4.8 × 10^-8 A/cm^2 at 3 V, a high breakdown electric field of 8.61 MV/cm as well as acceptable voltage coefficients of capacitance (VCCs) of 795 ppm/V2 and 268ppm/V at 1 MHz. The observed properties should be attributed to high-quality Al2O3 film and chemically stable TaN electrodes. Further, a logarithmically linear relationship between quadratic VCC and frequency is observed due to the change of relaxation time with carrier mobility in the dielectric. The conduction mechanism in the high field ranges is dominated by the Poole-Frenkel emission, and the leakage current in the low field ranges is likely to be associated with trap-assisted tunnelling. Meanwhile, the Al2O3 dielectric presents charge trapping under low voltage stresses, and defect generation under high voltage stresses, and it has a hard-breakdown performance. 相似文献
2.
Molecular dynamics simulation is employed to study the structural evolution of low density amorphous ice during its compression from one atmosphere to 2.5 GPa. Calculated results show that high density amorphous ice is formed at an intermediate pressure of -1.0 GPa; the O-O-O bond angle ranges from 83° to 113°, and the O-H… O bond is bent from 112° to 160°. Very high density amorphous ice is obtained by quenching to 80 K and decompressing the ice to ambient pressure from 160 K/1.3 GPa or 160 K/1.7 GPa; and the next-nearest O-O length is found to be 0.310 nm, just 0.035 nm beyond the nearest O-O distance of 0.275 nm. 相似文献
3.
Noise in a coupling electromagnetic detecting system for high frequency gravitational waves
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This paper discusses the basic categories of noise in detecting high
frequency gravitational waves in the microwave band (~0.1--10 GHz), which contain shot noise from the laser and the
thermal radiation photons, thermal noise from statistical
fluctuation of the thermal photons and fluctuation of the
temperature, radiation press noise on the fractal membrane, the
noise caused by the scattering of the Gaussian Beam (GB) in the
detecting tube and noise in the microwave radiometers. The analysis
shows that a reasonable signal-to-noise ratio may be achieved for a
detecting device with the fixed power of GB (105 W), only when
the temperature of the environment is no more than T=1 K, and the
optimal length of the microwave radiometers is about 0.3 m. 相似文献
4.
Investigations of the electron paramagnetic resonance parameters and the tetragonal local structure for (VCl6)4- coordination complex in MCl:V2+ (M=Na, K, Rb) systems
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By simulating the electron paramagnetic resonance (EPR) and optical spectra on the basis of the 120×120 complete energy matrix, this paper determines the local lattice structure parameters R1 and R2 for MCl:V2+ (M=Na, K, Rb) systems at 77 K, 195 K and RT (room temperature 295 K or 302 K), respectively. The theoretical results indicate that there exists a compressed distortion in MCl:V2+ systems. Meanwhile, it finds that the structure parameters R1, R2 and |△R| (= R1-R2) increase with the rising temperature. Subsequently, from the analysis it concludes that the relation of EPR parameter D vs.△R is approximately linear. Finally, the effects of orbital reduction factor k on the g factors for the three systems have been discussed. 相似文献
5.
Magnetic properties and magnetocaloric effects of
Tb6Co1.67Si3 have been investigated by magnetization
measurement. This compound is of a hexagonal
Ce$_{6}$Ni$_{2}$Si$_{3}$-type structure with a saturation
magnetization of 187\,emu/g at 5\,K and a reversible second-order
magnetic transition at Curie temperature $T_{\rm C} = 186$\,K. A
magnetic entropy change $\Delta S =
7$\,J\,$\cdot$\,kg$^{-1}$\,$\cdot$\,K$^{-1}$ is observed for a
magnetic field change from 0 to 5\,T. A large value of refrigerant
capacity (RC) is found to be 330\,J/kg for fields ranging from 0 to
5\,T. The large RC, the reversible magnetization around $T_{\rm C}$
and the easy fabrication make the Tb6Co1.67Si3
compound a suitable candidate for magnetic refrigerants in a
corresponding temperature range. 相似文献
6.
The total internal partition sums were calculated in the product
approximation at temperatures up to 5000\,K for the asymptotic
asymmetric-top HO$_{2}$ molecule. The calculations of the rotational
partition function and the vibrational partition function were
carried out with the rigid-top model and in the harmonic oscillator
approximation, respectively. Our values of the total internal
partition sums are consistent with the data of HITRAN database with
$-$0.14{\%} at 296\,K. Using the calculated partition functions, we
have calculated the line intensities of $\nu _{2}$ band of HO$_{2}$
at several high temperatures. The results showed that the calculated
line intensities are in very good agreement with those of HITRAN
database at temperatures up to 3000\,K, which provides a strong
support for the calculations of partition functions and line
intensities at high temperatures. Then we have extended the
calculation to higher temperatures. The simulated spectra of
$\nu_{2}$ band of the asymptotic asymmetric-top HO$_{2}$ molecule at
4000 and 5000\,K are also obtained. 相似文献
7.
A simulation study of microstructure evolution during solidification process of liquid metal Ni
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A molecular dynamics simulation study has been performed for the
microstructure evolution in a liquid metal Ni system during
crystallization process at two cooling rates by adopting the
embedded atom method (EAM) model potential. The bond-type index
method of Honeycutt--Andersen (HA) and a new cluster-type index
method (CTIM-2) have been used to detect and analyse the
microstructures in this system. It is demonstrated that the cooling
rate plays a critical role in the microstructure evolution: below the
crystallization temperature $T_{\rm c}$, the effects of cooling rate
are very remarkable and can be fully displayed. At different cooling
rates of $2.0\times10^{13}$\,K\,$\cdot$\,s$^{-1}$ and
$1.0\times10^{12}$\,K\,$\cdot$\,s$^{-1}$, two different kinds of
crystal structures are obtained in the system. The first one is the
coexistence of the hcp (expressed by (12 0 0 0 6 6) in CTIM-2) and
the fcc (12 0 0 0 12 0) basic clusters consisting of 1421 and 1422
bond-types, and the hcp basic cluster becomes the dominant one with
decreasing temperature, the second one is mainly the fcc (12 0 0 0 12
0) basic clusters consisting of 1421 bond-type, and their
crystallization temperatures $T_{\rm c}$ would be 1073 and 1173\,K,
respectively. 相似文献
8.
This paper reports that a novel type of suspended ZnO nanowire field-effect
transistors (FETs) were successfully fabricated using a
photolithography process, and their electrical properties were
characterized by I--V measurements. Single-crystalline ZnO
nanowires were synthesized by a hydrothermal method, they were used
as a suspended ZnO nanowire channel of back-gate field-effect
transistors (FET). The fabricated suspended nanowire FETs showed a
p-channel depletion mode, exhibited high on--off current ratio of
~105. When VDS=2.5 V, the peak transconductances
of the suspended FETs were 0.396 μS, the oxide capacitance was
found to be 1.547 fF, the pinch-off voltage VTH was about
0.6 V, the electron mobility was on average 50.17 cm2/Vs. The
resistivity of the ZnO nanowire channel was estimated to be
0.96× 102Ω cm at VGS = 0 V. These
characteristics revealed that the suspended nanowire FET fabricated
by the photolithography process had excellent performance. Better
contacts between the ZnO nanowire and metal electrodes could be
improved through annealing and metal deposition using a focused ion
beam. 相似文献
9.
S. E. Zelenskii 《Journal of Applied Spectroscopy》2006,73(3):470-472
A new optical method is proposed for measuring the temperature of an incandescent filament under vacuum. The method is based
on measurement of the intensity of thermal radiation at one fixed wavelength while varying the magnitude of the filament current,
without using a calibrated reference radiator. The method has been experimentally tested.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 3, pp. 414–416, May–June, 2006. 相似文献
10.
ZnO films have been prepared on p-type Si substrates by metal-organic chemical vapour deposition (MOCVD) at different total gas flow rates. The current versus voltage and temperature (I - V - T) characteristics, the deep-level transient spectroscopy (DLTS) and the photoluminescence (PL) spectra of the samples were measured. DLTS shows two deep-level centres of E1 (Ec-0.13±0.02eV) and E2 (Ec-0.43±0.05eV) in sample 1202a, which has a ZnO/p-Si heterostructure. A deep level at Ec-0.13±0.01 eV was also obtained from the I -T characteristics. It was considered to be the same as E1 obtained from DLTS measurement. The emission related to this deep level center was detected by PL spectra. In addition, the energy location and the relative trap density of E1 was varied when the total gas flow rate was changed. 相似文献
11.
In the present work, a Cz-Silicon wafer is implanted with helium ions to produce a buried porous layer, and then thermally annealed in a dry oxygen atmosphere to make oxygen transport into the cavities. The formation of the buried oxide layer in the case of internal oxidation (ITOX) of the buried porous layer of cavities in the silicon sample is studied by positron beam annihilation (PBA). The cavities are formed by 15 keV He implantation at a fluence of 2×10^16 cm^-2 and followed by thermal annealing at 673 K for 30 min in vacuum. The internal oxidation is carried out at temperatures ranging from 1073 to 1473 K for 2 h in a dry oxygen atmosphere. The layered structures evolved in the silicon are detected by using the PBA and the thicknesses of their layers and nature are also investigated. It is found that rather high temperatures must be chosen to establish a sufficient flux of oxygen into the cavity layer. On the other hand high temperatures lead to coarsening the cavities and removing the cavity layer finally. 相似文献
12.
Simulated human eye retina adaptive optics imaging system based on a liquid crystal on silicon device
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In order to obtain a clear image of the retina of model eye, an
adaptive optics system used to correct the wave-front error is
introduced in this paper. The spatial light modulator that we use
here is a liquid crystal on a silicon device instead of a
conversional deformable mirror. A paper with carbon granule is used
to simulate the retina of human eye. The pupil size of the model eye
is adjustable (3--7mm). A Shack-Hartman wave-front sensor is used
to detect the wave-front aberration. With this construction, a value
of peak-to-valley is achieved to be 0.086Λ, where
Λ is wavelength. The modulation transfer functions before
and after corrections are compared. And the resolution of this
system after correction (69lp/m) is very close to the diffraction
limit resolution. The carbon granule on the white paper which has a
size of 4.7μm is seen clearly. The size of the retina cell is
between 4 and 10μm. So this system has an ability to image
the human eye's retina. 相似文献
13.
A chemical vapour deposition (CVD) diamond film detector was prepared and the main characteristics for pulsed proton detection were studied at Beijing Tandem Accelerator. The result shows that the charge collection efficiency of the detector increases with increasing electric field intensity and reaches to 9.44% at 5 V/μm with the charge collection distance of 15.9 μm. The relationship between the sensitivity of the detector and proton energy is consistent with the Monte Carlo (MC) simulation result. Its plasma time for a pulse with 4.85×10^5 protons is 1l.2ns. The dose threshold for onset of damage under 9MeV proton irradiation in the detector is about 10^13 cm^-2. All of the results show that a CVD diamond detector has fast time response and high radiation hardness, and can be used in pulsed proton detection. 相似文献
14.
Anomalous magnetic properties of an iron film system deposited on fracture surfaces of α-Al2O3 ceramics
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An iron film percolation system is fabricated by vapour-phase deposition on fracture surfaces of α-Al2O3 ceramics. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization measurement reveals that the magnetic phase of the film samples evolve from a high-temperature ferromagnetic state to a low-temperature spin-glass-like state, which is also demonstrated by the temperature-dependent ac susceptibility of the iron films. The temperature dependence of the exchange bias field He of the iron film exhibits a minimum peak around the temperature T=5 K, which is independent of the magnitude of the cooling field Hcf. However, for T 〉 10K, (1) He is always negative when Hcf=2kOe and (2) for Hcf= 20 kOe (1Oe≈80 A/m), He changes from negative to positive values as T increases. Our experimental results show that the anomalous hysteresis properties mainly result from the oxide surfaces of the films with spin-glass-like phase. 相似文献
15.
Study of a rectangular coupled cavity extendedinteraction oscillator in sub-terahertz waves
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An extended interaction oscillator (EIO) generating 120 GHz wave in sub-terahertz waves is studied by using the three-dimensional electromagnetic simulation software CST and PIC codes. A rectangular reentrant coupled-cavity is proposed as the slow-wave structure of EIO. By CST, the circuit parameters including frequency-phase dispersion, interaction impedance and characteristic impedance are simulated and calculated. The operation mode of EIO is chosen very close to the point where βL = 2π with corresponding frequency 120 GHz, the beam voltage 12 kV and the dimensions of the cavity with the period 0.5mm, the height 3mm and the width 1.4mm. Simulation results of beam-wave interaction by PIC show that the exciting frequency is 120.85 GHz and output peak power 465 W with 12-period coupled-cavity with the perveance 0.17 μP. Simulation results indicate that the EIO has very wide range of the operation voltage. 相似文献
16.
Effects of Nd-doping on the magnetic properties and magnetocaloric effects (MCEs) of NdxLa1-xFe11.5Al1.5 have been investigated. Substitution of Nd leads to a weakening of the antiferromagnetic (AFM) coupling and an enhancement of the ferromagnetic (FM) coupling. This in turn results in a complex magnetic behaviour for Nd0.2La0.8Fe11.5Al1.5 characterized by the occurrence of two phase transitions at ~188 K (PM AFM) and ~159 K (AFM-FM). As a result, a table-like MCE (9 J/kg.K) is found in a wide temperature range (160-185 K) for a field change of 0-5T around the transition temperature, as evidenced by both the magnetic and calorimetric measurements. Based on the analysis of low-temperature heat capacity, it is found that the AFM-FM phase transition modifies the electron density significantly, and the major contribution to the entropy change comes from the electronic entropy change. 相似文献
17.
Judd-Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91μm Tm:YLF laser
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The Ho:YAP crystal is grown by the Czochralski technique.The room temperature polarized absorption spectra of Ho:YAP crystal was measured on a c cut sample with 1 at% holmium.According to the obtained Judd-Ofelt intensity parameters Ω2 = 1.42 × 10-20 cm2,Ω4 = 2.92 × 10-20 cm2,and Ω6 = 1.71 × 10-20 cm2,this paper calculated the fluorescence lifetime to be 6 ms for 5I7 →5 I8 transition,and the integrated emission cross section to be 2.24×10-18 cm2.It investigates the room temperature Ho:YAP laser end pumped by a 1.91 μm Tm:YLF laser.The maximum output power was 4.1 W when the incident 1.91 μm pump power was 14.4 W.The slope efficiency is 40.8%,corresponding to an optical to optical conversion efficiency of 28.4%.The Ho:YAP output wavelength was centred at 2118 nm with full width at half maximum of about 0.8 nm. 相似文献
18.
A. Martínez Torres K. P. Khemchandani D. Jido Y. Kanada-En’yo A. Hosaka 《Few-Body Systems》2013,54(1-4):333-337
Few body systems made of pseudoscalars, like ${K\, K \, \bar K,\,\pi \, K \, \bar K}$ , are studied within a coupled channel approach based on solving the Faddeev equations considering two-body chiral t-matrices as input. As a result, we have found dynamical generation of several states which can be associated with some of the pseudoscalar states listed by the Particle Data Group, like K(1460) or π(1300). The amplitudes obtained have been then used to study systems like f 0(980) π π and ${f_0(980)K \, \bar K}$ and an evidence for a f 0 resonance around 1,790 MeV is found. 相似文献
19.
The effects of interstitial oxygen on superconducting electronic phases in strontium and oxygen co-doped La1.937Sr0.063CuO4+δ
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Strontium and oxygen co-doped La1.937Sr0.063CuO4+δ superconductor with Tc≈ 40K, which is obtained by oxidizing strontium-doped starting ceramic sample La1.937Sr0.063CuO4 in NaC10 solution, is annealed under different conditions to allow interstitial oxygen to redistribute. The evolution of the intrinsic superconducting property with the oxygen redistribution is studied in detail by magnetic measurements in various fields. It is found that there occurs the electronic phase separation from the single superconducting phase with Tc ≈ 40 K into two coexisting superconducting states with values of Tc: 15 and 40K or of 15 and 35 K in this system, depending on annealing condition. Our results indicate that the 15, 35 and 40 K superconducting phases associated with the excess oxygen redistribution are all thermodynamically meta-stable intrinsic states in this Sr/O co-doped cuprate. 相似文献
20.
This paper reports that the tunable self-phase-stabilized infrared
laser pulses have been generated from a two-stage optical parametric
amplifier. With an 800 nm pump source, the output idler pulses are
tunable from 1.3 μm to 2.3 μm, and the maximum output
energy of the idler pulses is higher than 1 mJ at 1.6 μm by
using 6 mJ pump laser. A carrier-envelope phase fluctuation of
~ 0.15 rad (rms) for the idler pulses is measured for longer
than one hour by using a home build f-to-2f interferometer. 相似文献