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Akira Hashizume, Yoshihiko Tendow
1963 Volume 18 Issue 8 Pages
1107-1111
Published: August 05, 1963
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The gamma-rays following the decay of 8-hour
176Ta have been investigated using scintillation technique.
176Ta was produced by two, different procedures; first by a reaction
181Ta(
p, 6
n)
176W and electron capture decay
176W→
176Ta, second by
175Lu(α, 3
n)
176Ta. The gamma-ray spectra, containing gamma-rays of up to ∼3 MeV, revealed to have very complex structure. The spectrum was decomposed into at least 23 gamma-rays using response functions of NaI(Tl) for mono-energic gamma-rays. Sum coincidence and ordinary coincidence measurements were performed.
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Masayasu Ishihara
1963 Volume 18 Issue 8 Pages
1111-1115
Published: August 05, 1963
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Decay characteristics of
72Zn was studied.
72Zn was produced by the (γ, α) reaction on germanium and separated chemically. Radiations were measured with a scintillation spectrometer. Half life of this nuclide was determined to be 36.5 hours. The decay goes mainly with a 0.3-MeV beta component to a level which decays with a 145-keV gamma ray followed by a 18-keV gamma transition. Another weak component is followed by a 190-keV and the same 18-keV gamma transitions. Decay scheme is discussed.
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O. P. Puri
1963 Volume 18 Issue 8 Pages
1115-1121
Published: August 05, 1963
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Shellac Wax can be made to behave as an electret and two simple methods of preparing Shellac Wax electrets under different experimental conditions have been given. The charge decay curves and the charge measuring technique has been presented. The dielectric follows the accepted qualitatiue theory of electret behaviour. This paper also discusses the phenomenon of hetero-charge and homo-charge. The maximum surface charge of 7.5 e.s.u. per cm
2 has been measured.
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Ken-ihir\={o} Ishii, Hiroshi Kih\={o}
1963 Volume 18 Issue 8 Pages
1122-1132
Published: August 05, 1963
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The atom arrangements and the motion of twin dislocation in β-tin crystal, accompanying the inhomogeneous movement of atoms, are described. Then, it is pointed out that, in the case of β-tin crystal, all of the steps caused on the twin boundary by the passage of slip dislocations are composed of twin dislocations, the number of segments of twin dislocations being equal to the number of twin layers cut through by the Burgers vector of the slip dislocation.
The transformation matrix for the transformation of the Miller indices of slip dislocations are derived for the 〈\bar103〉 {301} twinning. These transformations characteristic of tin crystals have as results the stacking faults either in the parent crystal or in the twin, and the annihilation of some of the slip dislocations.
The above discussions are compared with available data. It is suggested that the substructure of twins in tin crystals observed by the transmission electron microscopy will be composed of twin dislocations produced by the arrays of slip dislocations cutting through the twin boundary.
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Ken-ichir\={o} Ishii, Hiroshi Kih\={o}
1963 Volume 18 Issue 8 Pages
1133-1139
Published: August 05, 1963
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The steps caused by the screw dislocations on the twin boundary of β-tin crystal are responsible for the thickening of mechanical twins, since all of these steps are composed of twin dislocations in the case of β-tin crystal. Possible origins of the stress needed to the motion of twin dislocations are first, the stress for the twin dislocations to pass through the forest of screw dislocations, and second, the stress to form the stacking fault in the twin. Numerical estimations are in consistency with observations.
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Takasu Hashimoto
1963 Volume 18 Issue 8 Pages
1140-1147
Published: August 05, 1963
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In order to obtain informations on superexchange interaction, the magnetic susceptibility of KNiF
3 and the solid solutions between KMnF
3, KCoF
3 and KNiF
3 has been measured in the temperature range between 80°K and 850°K. The values of exchange integral |
J⁄
k| between the two adjacent magnetic ions are derived by use of the molecular field approximation and by use of the Danielian-Stevens (D-S) procedure as follows:
(
Remark: Graphics omitted.)
From θ all of the superexchange interactions are supposed to be antiferromagnetic.
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Akira Tasaki, Sh\={u}ichi Iida
1963 Volume 18 Issue 8 Pages
1148-1154
Published: August 05, 1963
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Synthetic single crystals were grown by the flux method. It was confirmed that the weak ferromagnetic moment appears only when the spins lie in the (111) plane. Contrary to the case of polycrystallines specimens, recovery of the residual magnetization or the memory phenomenon is not observed. It was found, below the transition temperature, a very small amount of the residual magnetic moment along the direction of the field during cooling.
Microwave (36,000 MC/sec) resonance studies found a very small six-fold anisotropy (
Kh=0.09 erg/gr.) in the (111) plane. The resonance line was easily broadened by stresses applied on the crystals. A reasonable agreement is obtained with the data of microwave studies by Abe et al., after taking into account the effect of magnetoelastic coupling. It is suggested that internal strains may induce a dominant uniaxial anisotropy in the (111) plane in polycrystals through their magnetoelastic coupling.
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Tokujiro Fuke
1963 Volume 18 Issue 8 Pages
1154-1161
Published: August 05, 1963
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The study of temperature and volume dependence of nuclear quadrupole resonance frequency is extended to crystals with large asymmetry parameter η. The resonance frequency of the I
127 nucleus in mercuric iodide (red) was measured as a function of hydrostatic pressure in the range 1–8000 kg/cm
2 at three temperatures. It is found that η depends more strongly on volume than
e2Qqzz⁄
h does, whereas η and
e2Qqzz⁄
h depend on lattice vibration amplitudes similarly. From the volume dependence of η the heterogeneity of the atomic displacements in the unit cell is estimated. Furthermore, by using both temperature and volume dependence data of
qzz and η, the origin for the variation of the resonance frequency is discussed.
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Tachiro Tsushima
1963 Volume 18 Issue 8 Pages
1162-1166
Published: August 05, 1963
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The magnetic properties and cation distributions of ferrite-chromite series of nickle and cobalt are investigated. Although the magnetic moments at absolute zero temperature are well explained by simple Néel model as far as the series remain inverse spinel structure, they begin to deviate significantly from the values evaluated by his model when they change to normal spinel. The possible origin of this anomalous magnetic moment of the series is discussed.
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Tokio Ohta
1963 Volume 18 Issue 8 Pages
1166-1173
Published: August 05, 1963
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A quantum theory is developed for the phonon-drag thermoelectric power of semiconductors in a longitudinal strong magnetic field with the use of the quantum limit approximation. Thermoelectric power in pure crystal is first calculated to give
ΔQ(
B)⁄
Q(0)=
k[ijk](hω
c⁄
kT)
1⁄2 where
ΔQ(
B) is the incremental thermoelectric power due to magnetic field,
Q(0) is the thermoelectric power without the field, k
[ijk] is a constant dependent on the crystal direction [
ijk], and ω
c is the cyclotron frequency. This can explain an experiment approximately. Saturation effect, impurity scattering effect, and the Herring’s hydraulic analogue are also discussed taking the magnetic field into account.
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Kojiro Takagi, Takeshi Oka
1963 Volume 18 Issue 8 Pages
1174-1180
Published: August 05, 1963
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A Stark modulation-type spectrograph has been constructed. Millimeter wave klystrons are used as the power source. The sensitivity of the spectrograph is about 2×10
−7 cm
−1 at 70 Gc, when the spectral lines are displayed on a cathode-ray oscilloscope with a sweep rate of 1 cps.
R-branch transitions 1
01←0
00 of the formaldehyde isotopic species H
2C
13O, H
2CO
18, HDCO, D
2CO, D
2C
13O and D
2CO
18 have been measured and their rotational constants have been determined. The observed inertia defects of D
2CO, H
2C
13O and H
2CO
18 are shown to be in good agreement with the predicted theoretical values. From the observed rotational constants the
rz-structures of formaldehyde are determined to be
H
2CO
rCO=1.2078±0.003 A,
rCH=1.1161±0.007 A,∠HCH=116°31′±40′
D
2CO
rCO=1.2078±0.003 A,
rCD=1.1117±0.007 A,∠DCD=116°37′±40′.
It is shown that small difference between the
rz-structures of different isotopic species is not negligible. This effect has been taken into consideration in the determination of the molecular structure.
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Sigetosi Tanisaki
1963 Volume 18 Issue 8 Pages
1181-1191
Published: August 05, 1963
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The disordered structure above the Curie temperature (about 160°C) of NaNO
2 was studied by the X-ray diffuse scattering. The observed diffuse scattering, the satellites or the diffuse maxima and the plate-like diffuse scattering normal to the
b* axis around them, can be interpreted on the basis of a certain disordered arrangement of two kinds of structure units. The atomic positions in each structure unit were determined from the relative intensity of the Bragg reflections and that of the satellites. The proposed model for the arrangement is the uniform mixing along the
a axis of two kinds of small plate-like domains with antiparallel polarizations, “microdomains”, whose widths are of the order of several lattice constants. In the real crystal there is a certain degree of disturbance in the uniform mixing along the
a axis, and each microdomain has a certain degree of disorder. The disturbance and the disorder increase with increasing temperature, but the ordered alignment along the
b axis remains in some degree up to about 240°C. The microdomain structure is similar to the structure of the antiferroelectrics, since the polarization of microdomain can be reversed by the external electric field.
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V and Ti Metals and V-Cr and V-Ti Alloys
Masao Shimizu, Takeshi Takahashi, Atsushi Katsuki
1963 Volume 18 Issue 8 Pages
1192-1203
Published: August 05, 1963
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Calculations on temperature variations of electronic specific heats and magnetic susceptibilities are performed for V and Ti metals and V-Cr and V-Ti alloys by making use of the density of states determined from low temperature specific heat data for the iron group transition metals and their alloys. Temperature variations of electronic specific heats for V and Ti metals are explained by the present numerical calculations. Temperature variations of magnetic susceptibilities are well explained by taking account of the effect of the temperature independent orbital paramagnetism for V and Cr metals and V-Cr alloys and by taking account of the effects of the temperature independent orbital paramagnetism and the positive and the negative molecular fields for Ti metal and V-Ti alloys. The Knight shifts of V
51 in V metal and V-Cr alloys are discussed and are considered to be composed of a large positive contribution due to the orbital motion of conduction electrons, a large negative one due to the exchange polarization and a small positive one due to the hyperfine interaction.
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Seiji Ikegami
1963 Volume 18 Issue 8 Pages
1203-1213
Published: August 05, 1963
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The frequency dependence and temperature dependence of the dielectric constant, far infrared reflectivities, grain sizes and densities of polycrystalline BaTiO
3, SrTiO
3 and TiO
2 were measured. From the results obtained, it is shown that, in BaTiO
3, the microwave dispersion occurs only in the ferroelectric phase and the dielectric constant at low frequencies corresponds to that under the condition of constants stress. Thus, it is concluded that the microwave dispersion in polycrystalline BaTiO
3 is due to the transition of the dielectric constant from the value at “free” state to that at “clamped” state with increasing frequency, in the neighborhood of the resonance frequencies of piezoelectric vibration of single domains in grains of this material.
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J. B. Shukla
1963 Volume 18 Issue 8 Pages
1214-1216
Published: August 05, 1963
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An exact solution of modified Navier-Stokes equations governing the unstedy flow of a conducting fluid between two parallel non-conducting porous plates in the presence of a transverse magnetic field at Prandtl Number I is given. The dependence of the skin friction at the lower plate on suction, magnetic field, viscosity and conductivity are treated.
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Shigeya Kuwabara
1963 Volume 18 Issue 8 Pages
1217
Published: August 05, 1963
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Asako Kawamori, Minoru Sakiyama
1963 Volume 18 Issue 8 Pages
1218-1219
Published: August 05, 1963
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Shinichi Nakashima, Yukio Miyai
1963 Volume 18 Issue 8 Pages
1219
Published: August 05, 1963
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S. B. S. Sastry, C. Ramasastry
1963 Volume 18 Issue 8 Pages
1220-1221
Published: August 05, 1963
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Mitsuo Kasaya, Takemi Komatsubara, Eiji Hirahara
1963 Volume 18 Issue 8 Pages
1221-1222
Published: August 05, 1963
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Toshimitsu Yamazaki, Hidetsugu Ikegami, Mitsuo Sakai
1963 Volume 18 Issue 8 Pages
1222
Published: August 05, 1963
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Takeo Ichinokawa, Yukio Yamada
1963 Volume 18 Issue 8 Pages
1223
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Ken’ichi Sawamoto
1963 Volume 18 Issue 8 Pages
1224
Published: August 05, 1963
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S. M. Deshpande
1963 Volume 18 Issue 8 Pages
1225
Published: August 05, 1963
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Saburo Miyake
1963 Volume 18 Issue 8 Pages
1226-1227
Published: August 05, 1963
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Takehiko Nakagawa, Shozo Sawada, Tatsuyuki Kawakubo, Shoichiro Nomura
1963 Volume 18 Issue 8 Pages
1227
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Taketoshi Yanagi, Shozo Sawada
1963 Volume 18 Issue 8 Pages
1228-1229
Published: August 05, 1963
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Ichiro Hatta, Shozo Sawada, Yohko Asao, Taketoshi Yanagi
1963 Volume 18 Issue 8 Pages
1229-1230
Published: August 05, 1963
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Yasuhiko Syono, Yoshikazu Ishikawa
1963 Volume 18 Issue 8 Pages
1230-1231
Published: August 05, 1963
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Yasuhiko Syono, Yoshikazu Ishikawa
1963 Volume 18 Issue 8 Pages
1231-1232
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D. S. Rodbell
1963 Volume 18 Issue 8 Pages
1232-1233
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Tomoyuki Takeuchi, Shozo Ikeda
1963 Volume 18 Issue 8 Pages
1234A
Published: August 05, 1963
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The drawings in Figs. 5 and 6 should be substituted for each other.
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Kunio Takamatsu
1963 Volume 18 Issue 8 Pages
1234B
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The values of the ordinate of the graphs for S
32(α
4) and S
32(α
5∼9) in Fig. 10 are incorrect and they should be multiplied by two. The rest of the graphs for S
32(α
0), S
32(α
1,2) and S
32(α
3) are presented correctly.
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