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  • 1
    Digitale Medien
    Digitale Medien
    Structure and magnetic properties of CeFe13−xSix compounds (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2866-2867 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: New iron-based rare-earth CeFe13−xSix (2.4≤x≤2.6) intermetallic compounds which crystallized in the NaZn13-type structure with Fm3c(O6h) space-group symmetry have been found. The ac susceptibility and the magnetization curve measurements are reported. The substitution of silicon for iron leads to an increase of the Curie temperature and a reduction of the unit-cell volume. The saturation magnetic moment decreases from 15.7μB/f.u. to 13.4μB/f.u. with x=2.4–2.6. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360092
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  • 2
    Digitale Medien
    Digitale Medien
    Crystallographic and magnetic properties of NdCo11−xSix compounds (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5200-5204 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effects of substitution of Si for Co on the crystal structural stability and magnetic properties of NdCo11−xSix compounds have been studied. X-ray diffraction and magnetic measurement show that the single phase region can be expressed as NdCo9.8–9.2Si1.2–1.8 other than NdCo9Si2. X-ray-diffraction study indicates that the compounds adopt the tetragonal BaCd11-type struc- ture. The magnetic properties of a series of NdCo11−xSix solid solutions have been studied by magnetic measurement. Our investigations show that the Curie temperature of NdCo11−xSix increases drastically from 528 K (x=1.8) to 833 K (x=1.2) as the Si content decreases. The Co magnetic moment reaches a maximum between NdCo9.8Si1.2 and NdCo9.6Si1.4, and decreases with the further increase in x. The substitution of Si for Co in NdCo11−xSix leads to a contraction of lattice constant a by 0.2%, c by 0.2%, and a consequent reduction of the unit-cell volume by about 0.6%. The Rietveld refinement results show that the silicon atoms preferentially occupy the 8(d) sites. The occupation of 8(d) sites by proper amount of Si will shift the Fermi level EF upward and to a valley with a lower local density of states in NdCo11−xSix compounds, which is favorable for the stability of the BaCd11-type structure. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363503
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  • 3
    Digitale Medien
    Digitale Medien
    Metamagnetic transition in PrCo13−xSix (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7887-7890 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Alloys of PrCo13−xSix (1.5≤x≤4.0) have been prepared by arc melting and subsequent annealing. X-ray powder diffraction proved that the alloys crystallized in the cubic NaZn13-type structure for x=1.5, and in the tetragonal NaZn13-derivative one for x≥2.0. Their Curie temperatures are almost independent of the Si content. Their magnetization curves exhibit a binary-step characteristic. The ac susceptibility curve indicates that there exists a magnetic transition below room temperature. The anomalous binary-step magnetization curves and the ac susceptibility curves versus temperature suggest a metamagnetic transition. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362400
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  • 4
    Digitale Medien
    Digitale Medien
    Crystal structure and magnetic properties of LaCo10Al3 (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 260-262 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The crystal structure and magnetic properties of a LaCo10Al3 intermetallic compound have been investigated by x-ray powder diffraction and magnetic measurement. The space group of the LaCo10Al3 structure is I4/mcm, which can be derived from the cubic NaZn13-type structure. Each unit cell contains four formula units of LaCo10Al3. The lattice parameters are a=8.085(1) A(ring), c=11.624(8) A(ring), and the calculated density is Dx=7.07(3) g/cm3. In each unit cell, there are five kinds of equivalent positions, i.e., 4a, 16l(1), 16k 16l(2), and 4d, which are occupied by 4La, 16Co(1), 16Co(2), 16(Co+Al) and 4Co(3) atoms, respectively. The tetragonal LaCo10Al3 intermetallic compound is ferromagnetic with a Curie temperature of 840 K. The magnetic moment per Co atom is 0.84μB, which can be explained by the magnetic valence model. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115656
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  • 5
    Digitale Medien
    Digitale Medien
    Expression of Bcl-2 but not Bax or p53 correlates with in vitro resistance to a series of anticancer drugs in breast carcinoma (2000)
    Springer
    Breast cancer research and treatment 61 (2000), S. 211-216 
    Details
    ISSN: 1573-7217
    Schlagwort(e): Bcl-2 ; breast cancer ; chemosensitivity ; HDRA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Programmed cell death is an important determinant of the response to chemotherapy. Among the factors controlling this process, a significant role is played by bcl-2, bax and p53. The in vitro chemosensitivity of the 177 breast carcinomas was assessed by the histoculture drug response assay (HDRA) using mitomycin C (MMC), 5-fluorouracil (5-Fu), adriamycin (ADM), cisplatin (CDDP), and cyclophosphamide (CPA). The susceptibility of Bcl-2-negative tumors to all the drugs killing was significantly higher than that of Bcl-2-positive tumors. No relationship between Bax or p53 immunoreactivity and sensitivity for any of anticancer drugs studied was demonstrated. Immunohistochemical results regarding Bcl-2 are promising in the evaluation of the sensitivity of cancer cells to a series of anticancer drugs and might be therapeutically useful as an indicator of response to adjuvant chemotherapy for breast cancer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006474307180
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