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31 December 1989, Volume 7 Issue 4
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Articles
THE SURFACE OXIDATION OF POLYCRYSTALLINECOPPER AND IRON AND THE THERMAL STABILITYOF THE SURFACE OXIDES STUDIED BY XPS
ZHAO LIANGZHONG, PAN CHENGHUANG
1989, 7(4): 283-288.
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XPS has been used to study air-formed surface oxides on pure copper and iron at both room-temperature and 300℃ and to study the thermal stability of the surface oxides. The results show that the room-temperature surface oxide (Cu
2
O, Fe
2
O
3
and cupric compounds) can be reduced into metal after being heated at 300~350℃ in high vacuum. The surface oxide (Cu
2
O and Fe
2
O
3
) formed at 300℃, however, can not be reduced into metal after being heated at the same conditions, though CuO can be reduced to Cu
2
O. It has been suggested that the room-temperature oxides in the two dimensional surface can differ from the bulk oxides with respect to thermodynamical properties.
A POSITRON ANNIHILATION STUDY FOR THE Ti-Ni ALLOYS
WANG JINGCHENG, QIN GUIYING
1989, 7(4): 289-293.
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The measurements of the S-shaped parameter of Doppler-broadening of positron annihilation were carried out for the near-equiatomic Ti-Ni alloys of different concentrations subjected to quenching at different temperatures and then annealed at different temperatures after quenching at 1000℃. The. result showed:(1) the change of S-parameter in the high temperature range of the quenching curves and in the low temperature range of the annealing curves could be explained by the mechanism of single vacancy, (2) for the Ti-Ni alloys, the positron could detect the precipitation in these probable ranges of temperature:300°~700℃ in Ti-49.0 at% Ni,350°~700℃ in Ti-50.0 at%Ni, and 400°~700℃ in Ti-50.5at% Ni, Ti-51.0at% Ni and Ti-51.5 at% Ni, (3) the amount of "defects" on the Ni-rich side was changed more easily by the conditions of the treatment than that on the Ti-rich side, and (4) the amount of "defects" on the Ni-rich side was lower than that on the Ti-rich side under the same condition of heat-treatment.
ESR STUDY OF THE STRUCTURE OF V
4+
IONS IN Na
2
O-B
2
O
3
-V
2
O
5
GLASSES
ZHANG XIANQUAN, PAN LINGZHANG, TIAN FENG, WU XUEWEN
1989, 7(4): 294-300.
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V
4+
ESR studies were carried out in the system of sodium boro-vanadate glasses (Na
2
O-B
2
O
3
-V
2
O
5
), and V
4+
ESR spectra were measured and analysed. It was found that V
4+
ions present in the glasses were in the form of vanadyl-type ions VO
2+
. The structure of the V
4+
ions was an octahedral six co-ordination with a tetragonal compression. The bonding properties of V
4+
ions were discussed as well.
STUDY OF ELECTRON MOMENTUM DISTRIBUTIONBY
γ
-RAY COMPTON SCATTERING AT LARGE SCATTERING ANGLE
WU TIEJUN, BIAN ZUHE, TANG XIAOWEI
1989, 7(4): 301-307.
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A set-up for measuring the Compton profile has been established. The Compton profiles of H
2
O (international standard sample for comparison), Al (three different thicknesses), LiF and Cu have been measured, using 59.54 KeV
γ
-rays from a 210 mCi
241
Am source at 165° fixed scattering angle.
Analyses and discussions are given.Our results for water are in agreement with published measurements of some foreign groups within an allowance of ±1%. It is suggested that the method and results are reliable.
LINEARIZATION MECHANISM AND EXPERIMENTALINVESTIGATION OF PTC CERAMIC MATERIALS FOR THERMISTOR APPLICATION
ZHOU FANGQIAO, TANG DAHAI, WU GUOAN, CHEN ZHIXIONG
1989, 7(4): 308-314.
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An analysis based on the double Shottcky barriers model at the grain boundaries of donor dopant BaTiO
3
ceramics indicated that the drift and diffusion conducting mechanism of free electrons might be substituted by a simple thermal excitation mechanism in the case of low density acceptor states at the grain boundaries; the relationship of equivalent resistivity dependence on temperature was derived and fitted with values; the results showed that the resistivity of PTC ceramic materials in the paraelectric phase was linear over a rather wide range of temperature.
The results of experimental investigation on PTC ceramic materials based on (Ba-Sr)TiO
3
showed that the density of the acceptor states at grain boundaries could be controlled by the modifier of composition and process, and the PTC ceramic materials with excellent linearity in the temperature region of about 120℃ could be prepared. The experimental results were also discussed.
STRUCTURE OF DIATOMIC MOLECULES ADSORBED ON GRAPHITE
GAO XINGQIU, ZHANG KAIMING, GAO ERZHEN
1989, 7(4): 315-320.
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Diatomic molecules, N
2
and Cl
2
, adsorbed on graphite, are studied using the EHT-cluster method. The structural properties, such as the adsorption site, orientation of the molecules, and the commensurate and incommensurate phases are discussed and compared with the experimental results.
CASCADE LASING IN Na VAPOR
LU YIQUN
1989, 7(4): 321-326.
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The new cascade lasings (2.3
μ
m, 330.2nm or 3.4
μ
m 330.2nm) were observed in a quartz tube containing Na vapor excited by a two-photon pump of 602.22nm or 578.9nm). The cascade lasings were from the following transitions.
THE MAGNETIC PROPERTIES, FERROMAGNETICRESONANCE AND MOSSBAUER EFFECT OF Y-GdIG SINGLE CRYSTAL SYSTEM
LI DEXIN, GUO SHUJIAO, LI GUODONG, ZHANG YAOXI, TENG YULI, YAN YONG
1989, 7(4): 327-332.
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The dependence of the saturation magnetic moment, ferromagnetic resonance (FMR) and Mössbauer effect on the composition and temperature for the Y
3-
x
Gd
x
Fe
5
O
12
single crystal system with
x
=0, 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 have been studied at a wide range of temperature. The variations of thermo-magnetic curves and compansation points with composition are explained by the theory of ferrimagnetism. The theoretically calculated results agree well with those of experiments. The line-widths of FMR for several theories are evaluated. It is found that the experimental results can be well explained by the phenome-nological theory of ferrimagnetic resonance with some reasonable assumptions. It is also tcund that the substitution of Gd
3+
for Y
3+
ions in the dodecahedral site has hardly any significant influence on the Mössbouer parameters of Fe
3+
ions in the tetrahedral and octahedral sites, whose spectra can be resolved into two subspectra again.
THE FIELD DISTRIBUTION OF ANTISY MMETRY MAGNETIC HEAD
XU SHU JUN, LI JINMIN, XU YAODE
1989, 7(4): 333-340.
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Recently, increasing attention has been paid to solving the electromagnetic problems by FEM. Computation of the field distribution of the antisymmetry magnetic head by the DE2D is descri bed and its characteristics are revealed in this paper. The results obtained have important bearing on the improvement of the design of the magnetic head.
TILT TRANSDUCER OF ELECTROLYTE TYPE AND THE DATA PROCESSING SYSTEM
DAI RENZI, LI SHENGCHIAKG, HU JIAZENG, LIN MIANZHONG, LU RONGQING
1989, 7(4): 341-345.
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The construction, technology, working circuits, temperature feature, and temperature compensation of the tilt transducer and its data processing system are introduced in this paper. The results show that the total error of the system is less than 2% due to the temperature compensation. The sensibility can reach 10-2 angular second. The system can be used not only for data processing but also for real-time control.
A MERGED ALGORITHM FOR BOOLIAN MASK OPERATION
YAO LINSHENG, XING YUANSHENG
1989, 7(4): 346-350.
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A flexible Boolian mask operation merged algorithm called A algorithm has been developed. It is suitable for a large amount of mask data, including diagonal edges that have any angle. Calculation of Boolian mask combination between different layers of an integrated circuit is a basic procedure in designing rule checking, connectivity checking and device recognition from the layout. A new and clear figure definition and a concise datastructure are used in A algorithm, making the algorithm treatments for various Boolian operations merged and unified. Furthermore, it is easy to design various Boolian operation programs by using A algorithm.
OTHER MONOTONE DECOMPOSITION THEOREMS OFBOOLEAN FUNCTION AND MONOTONE DECOMPOSITION THEOREMS ON BOOLEAN ALGEBRA
B
≠{0,1}
LIU YONGCAI
1989, 7(4): 351-356.
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In article[1] the necessary and sufficient condition is given, under which the Boolean function on {0, 1} can be resolved into inclusive-or logic operation of increasing function and decreasing function. In this article we extend this condition to other binary logic operations. In addition, accorcing bo the Boolean isomorphism theorem we also give monotone decomposition theorems of n-ary function on Boolean algebra
B
≠{0,1}.
STUDY ON THE STANDARDIZED UPPER BOUNDMODES AND THE FEASIBLE SLIP LINE FIELD INPLANE STRAIN PROBLEMS
LI SHUANGYI
1989, 7(4): 357-362.
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In this paper, it is proposed that the plane strain problems in plasticity can be solved with the standardized upper bound modes and the corresponding solutions. As an illustration of the above proposal, the standardized upper bound modes and the upper bound solutions for the compression of a strip between flat dies, indentation of a semi-infinite medium and a semi-infinite block of finite depth resting on a plane foundation by a flat die, die forging and compound extrusion are listed. It shows that the standardized upper bound solutions can make the upper bound solutions generalized, and easily and quickly obtained with a quite small over-estimate, and that the outline of the standardized upper bound modes is similar to that of the slip line field. The similarity of the two makes it possible to find the real slip line field of the corresponding problem and to identify the feasibility of presupposed slip line fields with the standardized upper bound mode.
TEMPERATURE DEPENDENCE OF STRONG COUPLING POLARON IN SEMI-INFINITE POLAR CRYSTALS
ZHAO GUOZHONG, GU SHIWEI
1989, 7(4): 363-366.
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In this paper, the effective Hamiltonian of the strong-coupling surface polaron in polar crystals at finite temperature is derived by means of the linearcombination operators proposed by Huybrechts. The numerical results for KBr are given. It is shown that the lattice vibration weakens the electron-pbonon coupling, and the thickness of the ‘dead layer’ of the polaron increases with the increase of temperature.
RADIATION HARD CHARACTERISTIC OF NITRIDED OXIDES ON SILICON
SHANG LUMING, ZHANG JIAWEI, JIAN YAOGUANG
1989, 7(4): 367-370.
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The effects of
60
Co gamma radiation on Al-Nitrided SiO
2
-Si system and the electron beam (5 kev) on the Si LW Auger spectra of nitrided SiO
2
films have been observed. The results show that the fixed charge density and the surface state density for the nitrided film appear to be less sensitive to gamma radiation than those for the SiO
2
film and the electron beam effect is almost neligible, because of Si-N bonds in the nitrided film.
ACOUSTIC EMISSION INVESTIGATION ON SURFACE QUALITY OF MAGNETIC RECORDING DISK AND MECHANICAL PERFORMANCE OF MAGNETIC HEAD
ZHANG HONGTIAN, BAI SEN, FANG GUANGDAN
1989, 7(4): 371-373.
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For increasing the recording density of the magnetic recording disk, the flying height of the magnetic head has to be reduced. This is very difficult as there are many protrusions on the disk which are difficult to inspect.
This paper presents the magnetic disk testing system monitored by acoustic emission. Based on the receiving signals, the surface quality of the disk could be evaluated.
In addition, by using the AE system, the processes of removing protrusions on the disk could be monitored, and the characteristics of the taking off and landing of the magnetic head could be observed.
PHOTOLUMINESCENCE OF GaAs FOR TRANSFERRED ELECTRONIC DEVICE
HOU ZHUANG, SU JIULING, WANG CHANGPING, QU FENGYUAN
1989, 7(4): 374-376.
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The photoluminescence of N-GaAg material used to manufacture the transferred electronic device is reported. On condition that there are the same electrical parameters, there exist more complexes of the Ga vacancy and donor impurity in VPE N-GaAs samples for low device yield.
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Bimonthly, Founded in 1983
Editor-in-Chief:Wang Tingyun
ISSN 0255-8297
CN 31-1404/N
