Search results for: M.F. Tai

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article

New superconductor SrPt2Ge2 with Tc=10.2K

H.C. Ku, I.A. Chen, C.H. Huang, C.W. Chen, more

Physica C: Superconductivity and its applications > 2013 > 493 > Complete > 93-95

Contrast to superconducting compounds SrNi ₂ Ge ₂ (T _c =1.1K) and SrPd ₂ Ge ₂ (T _c =3.2K) with the BaFe ₂ As ₂ -type body-center-tetragonal (122-bct) layer structure (space group I4/mmm), SrPt ₂ Ge ₂ crystallized in a pseudo-tetragonal, monoclinic structure with space group P2 ₁ and lattice parameters a=0.4401(4)nm<b=0...

article

Transport and magnetic properties of Mn-doped MgIn2−xO4

M.W. Lee, M.F. Tai, S.H. Chiou

Journal of Alloys and Compounds > 2008 > 461 > 1-2 > 316-320

Transport and magnetization of MgIn _2−x Mn _x O ₄ polycrystalline pellets (0<x<0.55) have been measured from 2 to 300K. Doping MgIn ₂ O ₄ with Mn results in an increase in electrical resistivity and a decrease in electron concentration. The electrical resistivity increases with decreasing temperature throughout the temperature range and variable-range hopping...

article

Transport properties in La ₀ _. ₇ (Ba ₁ _- _x Pb _x ) ₀ _. ₃ MnO ₃ ₊ _δ system

S.Z. Gong, M.F. Tai

Physica B: Physics of Condensed Matter > 2003 > 329-333 > Part 2 > 831-832

We investigated the crystallographic, transport and magnetic properties of a strongly electron correlated La ₀ _. ₇ (Ba ₁ _- _x Pb _x ) ₀ _. ₃ MnO ₃ ₊ _δ series with x=0-1.0. All our samples are in a rhombohedral R3c structure of lattice parameters a~0.550nm and c~1.338nm. We found that the addition of the larger Pb ion in La ₀...

article

Magnetic behavior in the La ₀ _. ₇ Pb ₀ _. ₃ Mn ₁ _- _x Co _x O ₃ perovskite compounds

J.B. Shi, Y.Y. Fan, M.F. Tai, H.Z. Chen, more

Journal of Magnetism and Magnetic Materials > 2002 > 239 > 1-3 > 8-10

Compositions with the rhombohedral structure have been successfully synthesized in the La ₀ _. ₇ Pb ₀ _. ₃ Mn ₁ _- _x Co _x O ₃ system. DC magnetization and AC susceptibility measurements were carried out for the entire series. The Curie temperature T _c decreases with increasing x from 306K (x=0.0) down to 60K (x=0.9). The antiferromagnetic...

article

Crystal structures and scaling behaviors of (La ₁ _- _x Pb _x )MnO ₃ and La ₀ _. ₇ (Ba ₁ _- _x Pb _x ) ₀ _. ₃ CoO ₃ systems with x=0-0.5

T.S. Huang, C.H. Chen, M.F. Tai

Journal of Magnetism and Magnetic Materials > 2002 > 239 > 1-3 > 97-99

The magnetic properties and scaling behaviors in both series La ₁ _- _x Pb _x MnO ₃ and La ₀ _. ₇ (Ba ₁ _- _x Pb _x ) ₀ _. ₃ CoO ₃ with x=0.0-0.5 were studied. All samples crystallize in a rhombohedral R3C space group with a~0.54nm and c~1.33nm. The Pb ² ⁺ substitution for La ³ ⁺ in the...

article

Monatomic structures of B, C, N, and O: first-principle study of relative stabilities and bulk moduli

James C.M. Sung, B.R. Wu, S.L. Lee, M.F. Tai

Materials Chemistry and Physics > 2001 > 72 > 2 > 136-140

Relative stabilities and bulk moduli of monatomic structures with coordination numbers 4 (cubic diamond or cd), 6 (simple cubic or sc), 8 (body-centered cubic or bcc), and 12 (face-centered cubic or fcc) for elements B, C, N, and O were calculated based on the first-principles. The structure for each element may be stabilized by the geometrical matching between the coordinated positions and the orbital...

article

Reaction of transition metals with carbon and implications for synthesis of diamond

C.M. Sung, M.F. Tai

Metal Powder Report > 1998 > 53 > 5 > 37

The carbide forming ability of metals is reviewed with respect to the number of vacancies in the d-orbitals in the electronic structure. Where this is zero, as in Cu and Zn, carbides are not formed. With a small number of vacancies, such as Fe, carbides are formed but Ti and V are strong carbide formers because of the numerous vacancies in the d-orbitals. Metals of intermediate reactivity may catalyse...

article

Reaction of transition metals with carbon and implications for synthesis of diamond

C.M. Sung, M.F. Tai

Metal Powder Report > 1998 > 53 > 5 > 37

article

Scaling law for vortex dynamics in Rb ₃ C ₆ ₀ superconductor

M.W. Lee, M.F. Tai, J.B. Shi

Physica C: Superconductivity and its applications > 1996 > 272 > 1-2 > 137-141

AC susceptibility of the Rb ₃ C ₆ ₀ superconductor shows a weak dependence on ac magnetic-field frequency f. The temperature, T _p , where χ is maximum, rises with increasing frequency and the effect is enhanced as the de magnetic-field amplitude H _d _c is increased. The temperature is found to obey a scaling law (1-T _p /T _c ) ³ ^/ ...

article

The trend of magnetic irreversibility for Rb ₃ C ₆ ₀ and its implications

M.F. Tai, C.M. Sung, M.W. Lee, J.B. Shi

Physica C: Superconductivity and its applications > 1996 > 272 > 1-2 > 131-136

The irreversibility magnetic field (H _i _r _r ) as a function of the irreversibility temperature (T _i _r _r ) for two-dimensional superconductors, e.g., the ones with a perovskite structure, can be characterized by an exponential law. However, with increased thermal agitation toward T _c , the coupling strength between adjacent superconducting (i.e., Cu-O ₂ ...

article

Superconductivity and magnetism of the (Hg ₀ _. ₇ Bi ₀ _. ₃ )Sr ₂ (Ca ₁ _- _x Pr _x )Cu ₂ O ₆ ₊ _δ system

J.B. Shi, H.J. Tsao, M.F. Tai

Physica C: Superconductivity and its applications > 1996 > 261 > 3-4 > 201-206

The (Hg ₀ _. ₇ Bi ₀ _. ₃ )Sr ₂ (Ca ₁ _- _x Pr _x )Cu ₂ O ₆ ₊ _δ system for 1.0 x 0.25 has been prepared. The transition temperature T _c always decreases as the rare-earth substitution parameter x increases. We observed the maximal T _c around x = 0.25 with 91 K. From the viewpoint of doping the ionic...

article

Magnetic anisotropy effects in nano-cluster nickel particles

Y.D. Yao, Y.Y. Chen, M.F. Tai, D.H. Wang, more

Materials Science & Engineering A > 1996 > 217-218 > 281-285

Nano-cluster Ni particles with average particle size from 12-100 nm were successfully prepared by the evaporation technique. For samples with an average particle size below roughly 50 nm, we observed a nonsymmetric magnetic hysteresis loop and a deviation between the zero field cooling (ZFC) and the field cooling (FC) magnetizations at temperatures below a critical temperature T _x . T ...

article

Studies of magnetic characterization and critical current density in Rb ₃ C ₆ ₀

M.F. Tai, G.F. Chang, M.W. Lee

Physica C: Superconductivity and its applications > 1995 > 255 > 1-2 > 105-112

Temperature-dependent magnetization and magnetic-hysteresis curves for the zero-field cooled and the field-cooled processes of Rb ₃ C ₆ ₀ superconducting fullerene with T _c of 30.5+/-0.1 K were measured between 5 and 30 K in magnetic fields up to 1 T. Small field-cooled diamagnetism and flux jumps were observed at low temperatures and in low fields. Both results strongly...

article

Critical current densities in K3C60/Rb3C60 powders determined from AC/DC susceptibility measurements

M.W. Lee, M.F. Tai, S.C. Luo, J.B. Shi

Physica C: Superconductivity and its applications > 1995 > 245 > 1-2 > 6-11

We report the magnetic J _c (T) in K ₃ C ₆₀ and Rb ₃ C ₆₀ powder samples for temperatures from 5 K to T _c . J _c near T _c was obtained from AC measurements whereas J _c at low temperatures was obtained from DC measurements. In the AC measurements, two χ″ peaks were observed on some of the samples. This is attributed to weak links...

article

Thermal and magnetic studies of nanocrystalline Ni

Y.D. Yao, Y.Y. Chen, C.M. Hsu, H.M. Lin, more

Nanostructured Materials > 1995 > 6 > 5-8 > 933-936

Ultra-fine Ni particles with average particle sizes from 12 to 100 nm were prepared by the evaporation technique. The calorimetric effects of nanocrystalline Ni as well as the NiO and Ni bulk samples were measured between 300 and 800 K. Both an exothermal effect between 380 and 480 K and an endothermal peak near 560 K were observed for ultrafine Ni; only endothermal peak was observed for both NiO...

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Keywords

MAGNETIC PROPERTIES (2)
LA 0 . 7 (BA 1 - X PB X ) 0 . 3 MNO 3 + Δ (1)
[MATERIALS] (LA 1 - X PB X )MNO 3 (1)
[MATERIALS] LA 0 . 7 (BA 1 - X PB X ) 0 . 3 COO 3 (1)
122-BCT LAYER CRYSTAL STRUCTURE (1)
AB INITIO CALCULATIONS (1)
AC SUSCEPTIBILITY (1)
COBALTATES (1)
COLOSSAL MAGNETORESISTANCE (1)
DC MAGNETIZATION (1)
GERMANIDE (1)
HARDNESS (1)
HIGH PRESSURE (1)
MAGNETIC ANISOTROPY (1)
MAGNETICALLY ORDERED MATERIALS (1)
MAGNETIZATION (1)
MAGNETORESISTANCE (1)
MANGANATES (1)
NANO-CLUSTERS (1)
NEW SUPERCONDUCTORS (1)
NICKEL (1)
OXIDE MATERIALS (1)
SCALING BEHAVIOR (1)
SEMICONDUCTORS (1)
TRANSITION METAL ALLOYS AND COMPOUNDS (1)
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