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“Ortho II structure in ABa2Cu307-d compounds (A=Er, Nd, Pr, Sm, Yb), pp”. Krekels T, Zou H, Van Tendeloo G, Wagner D, Buchgeister M, Hosseini SM, Herzog P, Physica: C : superconductivity 196, 363 (1992)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 52
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“Ortho-II structure in ABa2Cu3O7-\delta compounds (A=Er, Nd, Pr, Sm, Yb)”. Krekels T, Zou H, Van Tendeloo G, Wagener D, Buchgeister M, Hosseini SM, Herzog P, Physica: C : superconductivity 196, 363 (1992). http://doi.org/10.1016/0921-4534(92)90458-O
Abstract: Oxygen ordering has been investigated in superconducting ABa2Cu3O7-delta ceramic materials with A = Er, Nd, Sm and Yb, as well as in samples of this type with the rate earth A partially substituted by Pr. The critical temperature T(c) was determined as a function of the oxygen deficiency-delta of the compound and the corresponding microstructures were investigated by electron diffraction and electron microscopy. A distinct relationship exists between the width of the 60 K plateau and the ortho II ordering. Our results show that the ortho II ordered phase is the superconducting phase with a characteristic T(c) of 60 K.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 52
DOI: 10.1016/0921-4534(92)90458-O
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“A 94K Hg-based superconductor with a “1212&rdquo, structure HG0.5Bi0.5Sr2Ca1-xRxCu2O6+\delta (R=ND,Y,Pr)”. Pelloquin D, Hervieu M, Michel C, Van Tendeloo G, Maignan A, Raveau B, Physica: C : superconductivity 216, 257 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 62
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“Effects of the annealing conditions on the structural and superconducting properties of Bi2-xPbxSr2Y0.2Ca0.8Cu2Oz”. Calestani G, Salsi G, Francesconi MG, Masini M, Dimesso L, Migliori A, Zhang XF, Van Tendeloo G, Physica: C : superconductivity 206, 33 (1993). http://doi.org/10.1016/0921-4534(93)90698-P
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 10
DOI: 10.1016/0921-4534(93)90698-P
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“A mercury based superconducting cuprate, intergrowth of the 2201 and 1201 structures Tl2HgBa4Cu2O10+y”. Martin C, Huvé, M, Van Tendeloo G, Maignan A, Michel C, Hervieu M, Raveau B, Physica: C : superconductivity 212, 274 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 21
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“A new “1201&rdquo, mercury cuprate: the 27K-superconductor HG0.5Bi0.5Sr2-xLaxCuO5-\delta”. Pelloquin D, Michel C, Van Tendeloo G, Maignan A, Hervieu M, Raveau B, Physica: C : superconductivity 214, 87 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 62
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“A new “1212&rdquo, mercury-based 90K superconductor: (Hg1-xMx)O6+y”. Maignan A, Van Tendeloo G, Hervieu M, Michel C, Raveau B, Physica: C : superconductivity 212, 239 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 36
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“New 1212-type superconductors with a Tc up to 85K in the system Hg-Pr-Sr-Ca-Cu-O”. Hervieu M, Van Tendeloo G, Maignan A, Michel C, Goutenoire F, Raveau B, Physica: C : superconductivity 216, 264 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 66
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“New mercury-based superconductors with the “1201&rdquo, structure Hg0.4Pr0.6Sr2-xPrxCuO4+\delta and Hg0.3Pb0.7Sr2-xLaxCuO4+\delta”. Goutenoire F, Daniel P, Hervieu M, Van Tendeloo G, Michel C, Maignan A, Raveau B, Physica: C : superconductivity 216, 243 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 50
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“Superconductivity up to 110K in the 1212-Hg based cuprate Nd1-xCaxBa2Hg1-xCu2+xO6+y”. Maignan A, Michel C, Van Tendeloo G, Hervieu M, Raveau B, Physica: C : superconductivity 216, 1 (1993)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 32
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“SO4-chain formation and ordering in [YSrCa]Sr2Cu2.78(SO4)0.22O7-\delta”. Krekels T, Milat O, Van Tendeloo G, van Landuyt J, Amelinckx S, Slater PR, Greaves C, Physica: C : superconductivity 210, 439 (1993). http://doi.org/10.1016/0921-4534(93)90988-3
Abstract: YBCO-based materials containing SO4-tetrahedra centered on the Cu(1)-sites of the CuO-chain plane have been examined by means of electron diffraction and high resolution electron microscopy. An incommensurate modulation is observed and attributed to the ordering of b-oriented SO4-rich chains in the Cu(1)-S-O-layer, described in terms of an SO4-concentration wave.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 18
DOI: 10.1016/0921-4534(93)90988-3
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“Two phase intergrowth in Bi2Sr2Ca0.6Y0.4Cu2Oy single crystals”. Zhang XF, Van Tendeloo G, Ge SL, Emmen JHPM, Brabers VAM, Physica: C : superconductivity 215, 39 (1993). http://doi.org/10.1016/0921-4534(93)90362-T
Abstract: In Bi2Sr2Ca0.6Y0.4Cu2Oy single crystals we have identified the intergrowth of two phases; a normal Bi2Sr2CaCu2Oy type phase with a 4.6b modulation period and a secondary,phase with a 9.4b modulation period. Both the two phases have orthorhombic basic structures with similar lattice parameters but different symmetries, i.e. Bbmb for the normal phase and Ccca for the secondary phase. The c-parameters of these two phases are found to vary independently upon changing the nominal Y content. The modulation characteristics of the secondary phase implies a close structural relation between the two phases. Both phases are discussed from a structural and a compositional point of view.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 17
DOI: 10.1016/0921-4534(93)90362-T
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“Atomic structure and defect structure of the superconducting HgBa2Can-1CunO2n+2+\delta homologous series”. Van Tendeloo G, Chaillout C, Capponi JJ, Marezio M, Antipov EV, Physica: C : superconductivity 223, 219 (1994). http://doi.org/10.1016/0921-4534(94)91264-5
Abstract: The perfect as well as the defect structure of several members of the superconducting family HgBa2Can-1CunO2n+2+delta have been studied in detail by electron diffraction and high-resolution electron microscopy Identification of the cation configuration is possible, even in the defect regions, with the help of computer simulations. The fine structure of several defects is analyzed in detail, the most common defect being the intergrowth of slabs corresponding to different n values in the title formula. In general, however, the crystals are of a high perfection, particularly for the lower n members. The occurrence of double (HgO)delta layers is seen occasionally, indicating the possible existence of a material with a double mercury layer. Some of these defects are possibly related to recently discovered anomalies at 250 K in these compounds.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 30
DOI: 10.1016/0921-4534(94)91264-5
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“Copper oxycarbonates and mercury based cuprates: structural mechanisms of new superconductors”. Hervieu M, Michel C, Van Tendeloo G, Martin C, Maignan A, Raveau B, Physica: C : superconductivity 235/240, 25 (1994). http://doi.org/10.1016/0921-4534(94)91305-6
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 8
DOI: 10.1016/0921-4534(94)91305-6
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“Electron microscopy of recent high Tc superconductors”. Amelinckx S, Van Tendeloo G, Physica: C : superconductivity 235/240, 162 (1994). http://doi.org/10.1016/0921-4534(94)91338-2
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 6
DOI: 10.1016/0921-4534(94)91338-2
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“Lead-mercury-based superconductors –, the 1212-cuprate Pb0.7Hg0.3Sr2+xCa0.7Nd0.3-xCu2O7-\delta and the new oxycarbonate Pb0.7Hg0.3Sr4Cu2CO3O7”. Martin C, Hervieu M, Huvé, M, Michel C, Maignan A, Van Tendeloo G, Raveau B, Physica: C : superconductivity 222, 19 (1994). http://doi.org/10.1016/0921-4534(94)90109-0
Abstract: A new superconducting mercury oxycarbonate, Pb0.7Hg0.3Sr4Cu2CO3O7, has been synthesized. This tetragonal phase (a = 3.824 angstrom, c= 16.468 angstrom) consists of an intergrowth of two nonsuperconducting compounds, Sr2CuO2CO3 and Pb0.7Hg0.3Sr2CuO5. It exhibits after optimization a critical temperature of 70 K, with a sharp transition and a superconducting volume fraction of 50%. Its behavior can be compared to that of thallium oxycarbonates previously isolated. This study is completed by a reinvestigation of the 1212 cuprate of the system Hg-Pb-Sr-Ca-Nd-Cu. A superconducting phase with the 1212 structure, similar to that previously obtained but with a significantly different composition, Pb0.7Hg0.3Sr2+xCa0.7Nd0.3-xCu2O7, has been obtained, with a T(c onset) of 100 K. The behavior of the latter is compared with other lead-based 1212 cuprates.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 49
DOI: 10.1016/0921-4534(94)90109-0
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“Structural and physical properties of the new superconductor Hg0.5Pb0.5Sr4-xBaxCu2(CO3)O7-\delta”. Huvé, M, Van Tendeloo G, Hervieu M, Maignan A, Raveau B, Physica: C : superconductivity 231, 15 (1994). http://doi.org/10.1016/0921-4534(94)90138-4
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 14
DOI: 10.1016/0921-4534(94)90138-4
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“The superlattices in high Tc superconducting cuprates”. Milat O, Krekels T, Van Tendeloo G, Amelinckx S, Physica: C : superconductivity 235/240, 729 (1994). http://doi.org/10.1016/0921-4534(94)91589-X
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
DOI: 10.1016/0921-4534(94)91589-X
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“TEM study of YBa2Cu3O7-x thin films with Zn and Fe”. Verbist K, Van Tendeloo G, Ye M, Mehbod M, Deltour R, Physica: C : superconductivity 235, 663 (1994). http://doi.org/10.1016/0921-4534(94)91555-5
Abstract: Analytical and high resolution electron microscopy have been used to study the effect of Zn- and Fe-doping on the micro structure of [001] YBa2Cu3O7-x thin films on [001] MgO substrates grown by magnetron sputtering. Special attention was paid to the presence of second phase inclusions and surface outgrowths such as CuO, Y2Ba1Cu1O5-x, Y2O3 in order to establish a relationship with the critical current density.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
DOI: 10.1016/0921-4534(94)91555-5
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“2√2 ap x 2&radic, ap phase in superconducting ceramics”. Krekels T, Kaesche S, Van Tendeloo G, Physica: C : superconductivity 248, 317 (1995). http://doi.org/10.1016/0921-4534(95)00270-7
Abstract: By means of electron diffraction the 2 root 2 a(p) x 2 root 2 a(p) phase, well-known in YBa2Cu3O7-delta was observed in two other perovskite-based materials (Y0.75Ce0.25)(2)(Sr0.85Y0.15)(2)AlCU2O9 and Bi1.8Pb0.4Sr2Ca2Cu3O10+x. Highly correlated ordering is observed in the ab-plane, the correlation along the c-direction being weak. The plane group of the superstructure symmetry elements was determined on the basis of observed reflection conditions in diffraction patterns. Our results unambiguously rule out oxygen ordering as a possible origin of the superstructure. Experimental evidence points out that the superstructure is associated with the CuO2 layers, that are the only structural elements common to the three compounds studied. A model is proposed where the CuO2 sheet is displacively modulated. Experimental evidence suggests a correlation between adjacent CuO2 sheets. Comparison of simulated and experimental [001] zone diffraction patterns strongly supports our model.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 13
DOI: 10.1016/0921-4534(95)00270-7
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“A new way of synthesis and characterization of superconducting oxyfluoride Sr2Cu(O,F)4+\delta”. Ardashnikova EI, Lubarsky SV, Denisenko DI, Shpanchenko RV, Antipov EV, Van Tendeloo G, Physica: C : superconductivity 253, 259 (1995)
Abstract: Superconducting Cu mixed oxyfluoride, Sr,Cu(O, F)(4+delta), was Obtained via fluorination of Sr2CuO3 by XeF2 in the 100-250 degrees C temperature range in a closed Ni container. The prepared samples exhibited a lower T-c in comparison with earlier reported values. Different samples in the Sr-Cu-O-F system were prepared by a solid-state reaction at 220-400 degrees C, but no formation of the oxyfluoride was detected even with an addition of xenon difluoride. These data allow one to draw conclusions on the metastability of the oxyfluoride under the conditions used, Electron microscopy and X-ray powder diffraction studies revealed large amounts of badly crystallized SrF2; this could be a reason for the small superconducting volume fraction as well as for the inhomogeneous distribution of the anions.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 29
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“Structural aspect of YBa2Cu3O7-x films on Sis with complex barrier layers”. Vasiliev AL, Van Tendeloo G, Amelinckx S, Boikov Y, Olsson E, Ivanov Z, Physica: C : superconductivity 244, 373 (1995). http://doi.org/10.1016/0921-4534(95)00080-1
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 28
DOI: 10.1016/0921-4534(95)00080-1
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“Suppression of superconductivity in Hg-1223 and Hg-1234 by partial replacement of Hg by carbon”. Kopnin EM, Antipov EV, Capponi JJ, Bordet P, Chaillout C, de Brion S, Marezio M, Bobylev AP, Van Tendeloo G, Physica: C : superconductivity 243, 222 (1995). http://doi.org/10.1016/0921-4534(95)00010-0
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 22
DOI: 10.1016/0921-4534(95)00010-0
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“Combination of CeO2 and PtO2 doping for the strong enhancement of Jc under magnetic field in melt-textured superconductor YBaCuO”. Delamare MP, Hervieu M, Wang J, Provost J, Monot I, Verbist K, Van Tendeloo G, Physica: C : superconductivity 262, 220 (1996). http://doi.org/10.1016/0921-4534(96)00225-0
Abstract: A combination of CeO2 and PtO2 doping has been studied in melt-processed YBa2Cu3O7-x. This study was carried out using an optimized well established MTG process. The cerium-platinum doped samples exhibit a high fishtail effect with a J(c) of 4.3 x 10(4) A/cm(2) under an applied field of 1 T. Microstructural and nanostructural studies have been performed. The 211 and BaCeO3 inclusions are a few micrometers wide and the formation of a metastable nanocrystalline phase (Y4Ba4)Cu-8-x(Ce,Pt)(x)O-20+delta related to the perovskite is detected. The 123 grains show no specific extended defect generated by the doping process. The relationship between structure and properties are discussed.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 27
DOI: 10.1016/0921-4534(96)00225-0
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“Observation of superconductivity (Tc = 50K) in a new tetragonal alkaline-earth cuprate Sr0.8Ba1.2CuO3+\delta synthesised at ambient pressure”. Hodges JP, Slater PR, Edwards PP, Greaves C, Slaski M, Van Tendeloo G, Amelinckx S, Physica: C : superconductivity 260, 249 (1996). http://doi.org/10.1016/0921-4534(96)00118-9
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 7
DOI: 10.1016/0921-4534(96)00118-9
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“Inducing superconductivity and structural transformations by fluorination of reduced YBCO”. Shpanchenko RV, Rozova MG, Abakumov AM, Ardashnikova EI, Kovba ML, Putilin SN, Antipov EV, Lebedev OI, Van Tendeloo G, Physica: C : superconductivity 280, 272 (1997)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.404
Times cited: 35
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“Microstructure and flux pinning properties of melt textured grown doped YBa2Cu3O7-\delta”. Monot I, Verbist K, Hervieu M, Laffez P, Delamare MP, Wang J, Desgardin G, Van Tendeloo G, Physica: C : superconductivity 274, 253 (1997)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.404
Times cited: 33
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“Microstructure of α-axis oriented YBCO films on SrTiO3 substrates using a new template layer La4BaCu5O13”. Prouteau C, Verbist K, Hamet JF, Mercey B, Hervieu M, Raveau B, Van Tendeloo G, Physica: C : superconductivity 288, 231 (1997)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.404
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“Room temperature (2a x 2b) superstructure formed in Sr-submitted Bi2(Sr1.6Y0.4)CaCu2Oy single crystals”. Zhang XF, Van Tendeloo G, Hu DW, Brabers VAM, Physica: C : superconductivity 278, 31 (1997)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.404
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“Effects of fluorination on the structure and superconducting properties of Y2Ba4Cu7O14+ phases”. Abakumov A, Rozova M, Shpanchenko R, Kovba M, Putilin S, Antipov E, Lebedev O, Van Tendeloo G, Kopnin E, Karpinski J, Physica: C : superconductivity 301, 155 (1998). http://doi.org/10.1016/S0921-4534(98)00108-7
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.404
Times cited: 9
DOI: 10.1016/S0921-4534(98)00108-7
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