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123 results on '"Cheng, Z.X."'

39. Lanthanum doped multiferroic DyFe[O.sub.3]: structural and magnetic properties

Author

Du, Y., Cheng, Z.X., Wang, X.L., and Dou, S.X.

Subjects
Lanthanum -- Structure, Lanthanum -- Magnetic properties, Lanthanum -- Electric properties, Iron compounds -- Structure, Iron compounds -- Magnetic properties, Iron compounds -- Electric properties, Physics
Abstract

Several studies are conducted to explain the synthesis and the structural and magnetic properties of the various lanthanum doped multiferroic DyFe[O.sub.3]. The lattice parameters of the compounds are shown to increase linearly with an increasing La content.

Published
2010

40. A novel multiferroic system: rare earth chromates

Author

Cheng, Z.X., Wang, X.L., Dou, S.X., Kimura, H., and Ozawa, K.

Subjects
Antiferromagnetism -- Analysis, Yttrium -- Electric properties, Yttrium -- Magnetic properties, Physics
Abstract

Several studies are conducted to explain the different multiferroic properties of the various rare earth chromates. The compounds are shown to exhibit weak ferromagnetism at temperatures below the antiferromagnetic temperature.

Published
2010

41. Lead-free potassium bismuth titanate thin film with complex Aurivillius layer structure

Author

Cheng, Z.X., Wang, X.L., Zhao, H.Y., and Kimura, H.

Subjects
Bismuth -- Electric properties, Ferroelectric crystals -- Structure, Ablation (Vaporization technology) -- Usage, Platinum -- Electric properties, Silica -- Structure, Silica -- Electric properties, Titanium alloys -- Electric properties, Physics
Abstract

A ferroelectric thin film of Aurivillius phase [K.sub.0.5][Bi.sub.4.5][Ti.sub.4][O.sub.15] (KBT) with a complex bismuth layer-structure is prepared by using the pulsed laser deposition method. The thin film grown on Pt/Ti/Si[O.sub.2]/Si substrate has shown a strong c-axis orientation and Pt/KBT/Pt capacitor has shown a maximum polarization.

Published
2010

42. Magnetic glassy behavior in ferroelectric relaxor type solid solutions: magnetoelectric relaxor

Author

Cheng, Z.X., Wang, X.L., Alvarez, G., Dou, S.X., Zhang, S.J., and Shrout, T.R.

Subjects
Ferroelectric crystals -- Research, Iron alloys -- Magnetic properties, Iron alloys -- Electric properties, Iron alloys -- Structure, Lead alloys -- Magnetic properties, Lead alloys -- Electric properties, Lead alloys -- Structure, Niobium -- Magnetic properties, Niobium -- Electric properties, Perovskite -- Electric properties, Perovskite -- Magnetic properties, Titanium -- Magnetic properties, Titanium -- Electric properties, Physics
Abstract

The traditional solid state reaction method is used for preparing perovskite solid solution ceramics and ferroelectric and dielectric measurements have shown that these samples are relaxor type ferroelectric materials. The ac susceptibility measurement has showed that the peak position is dependent on frequency, thus indicating a glassy or relaxor type behavior and describing the 0.9Pb([Fe.sub.0.5][Nb.sub.0.5])[O.sub.3]-0.1PbTi[O.sub.3] to be a magnetoelectric relaxor material.

Published
2009

43. Enhancement of ferroelectricity and ferromagnetism in rare earth element doped BiFe[O.sub.3]

Author

Cheng, Z.X., Wang, X.L., Dou, S.X., Kimura, H., and Ozawa, K.

Subjects
Bismuth -- Electric properties, Bismuth -- Magnetic properties, Ferromagnetism -- Analysis, Iron alloys -- Electric properties, Iron alloys -- Magnetic properties, Ablation (Vaporization technology) -- Usage, Rare earth metals -- Electric properties, Physics
Abstract

Rare earth element doped BiFe[O.sub.3] thin films are fabricated by using the pulsed laser deposition method and various targets made from different starting [Fe.sub.2][O.sub.3] and [Fe.sub.3][O.sub.4] iron source materials. The studies have shown that the [Fe.sup.2+] ion has played an important role in compensating for the charge imbalance and reducing current leakage, as well as enhancing the magnetic moment through the introduction of antiferrimagnetic ordering at [Fe.sup.2+] site.

Published
2008

44. Reduction of superconducting transition temperature and flux pinning in Al and C codoped Mg[B.sub.2] with insight from first-principles calculations

Author

Li, A.H., Wang, X.L., Dou, S.X., Yao, Q.W., Cheng, Z.X., Soltanian, S., Yoo, J.M., and Munroe, P.

Subjects
Semiconductor doping -- Analysis, Aluminum -- Chemical properties, Aluminum -- Electric properties, Superconductors -- Analysis, Physics
Abstract

The Al and C codoping effect on the structures and superconductivity in Mg[B.sub.2] is studied by using first-principles calculations. The studies have shown that the observed decrease in the high critical temperature for the codoped Mg[B.sub.2] is understood in terms of a band filling effect due to the electron doping by both Al and C.

Published
2008

45. Structure, ferroelectric properties, and magnetic properties of the La-doped bismuth ferrite

Author

Cheng, Z.X., Li, A.H., Wang, X.L, Dou, S.X., Ozawa, K., Kimura, H., Zhang, S.J., and Shrout, T.R.

Subjects
Ferroelectric crystals -- Electric properties, Ferroelectric crystals -- Magnetic properties, Rare earth metals -- Electric properties, Rare earth metals -- Magnetic properties, Semiconductor doping -- Analysis, Spin coupling -- Analysis, Physics
Abstract

The effect of the La doping on the structure and on the ferroelectric, dielectric and magnetic properties of BiFe[O.sub.3] is studied. Doping with La has increased the ferromagnetic moment, due to the broken cycloid spin structure caused by the changes in the crystalline structure.

Published
2008

46. Magnetocaloric effect and magnetostructural coupling in Mn0.92Fe0.08CoGe compound

Author

Wang, J.L., Shamba, P., Hutchison, W.D., Gu, Q.F., Md Din, M.F., Ren, Q.Y., Cheng, Z.X., Kennedy, S.J., Campbell, S.J., and Dou, S.X.

Abstract

The structural properties of Mn0.92Fe0.08CoGe have been investigated in detail using synchrotron x-ray diffraction in zero and applied pressure (p = 0-10 GPa). A ferromagnetic transition occurs around TC = 300 K and a large magnetic-entropy change -ΔSM = 17.3 J/kg K detected at TC for a field change of ΔB = 5 T. The field dependence of -ΔSM max can be expressed as -ΔSM max ∞ B. At ambient temperature and pressure, Mn0.92Fe0.08CoGe exhibits a co-existence of the orthorhombic TiNiSi-type structure (space group Pnma) and hexagonal Ni2In-type structure (space group P63/mmc). Application of external pressure drives a structure change from the orthorhombic TiNiSi-type structure to the hexagonal Ni2In-type structure. A large anomaly in heat capacity around TC is detected and the Debye temperature θD (=319(±10) K) has been derived from analyses of the low temperature heat capacity, T ≲ 10 K.

Published
2015

48. Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Author

Wang, J.L. (author), Caron, L. (author), Campbell, S.J. (author), Kennedy, S.J. (author), Hofmann, M. (author), Cheng, Z.X. (author), Md Din, M.F. (author), Studer, A.J. (author), Brück, E. (author), Dou, S.X. (author), Wang, J.L. (author), Caron, L. (author), Campbell, S.J. (author), Kennedy, S.J. (author), Hofmann, M. (author), Cheng, Z.X. (author), Md Din, M.F. (author), Studer, A.J. (author), Brück, E. (author), and Dou, S.X. (author)

Abstract

We report the dramatic effect of applied pressure and magnetic field on the layered intermetallic compound Pr0.5Y0.5Mn2Ge2. In the absence of pressure or magnetic field this compound displays interplanar ferromagnetism at room temperature and undergoes an isostructural first order magnetic transition (FOMT) to an antiferromagnetic state below 158 K, followed by another FOMT at 50 K due to the reemergence of ferromagnetism as praseodymium orders (TCPr). The application of a magnetic field drives these two transitions towards each other, whereas the application of pressure drives them apart. Pressure also produces a giant magnetocaloric effect such that a threefold increase of the entropy change associated with the lower FOMT (at TCPr) is seen under a pressure of 7.5 kbar. First principles calculations, using density functional theory, show that this remarkable magnetic behavior derives from the strong magnetoelastic coupling of the manganese layers in this compound., RST/Radiation, Science and Technology, Applied Sciences

Published
2013
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