Synthesis of HgBa2Ca3Cu4Oy under ambient pressure

Usami, R.; Adachi, Seiji; Itoh, Makoto; Tatsuki, T.; Tokiwa‐Yamamoto, A.; Tanabe, K.

doi:10.1016/0921-4534(96)00165-7

Cited by 17 publications

(13 citation statements)

References 14 publications

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“…Although phases up to n = 4 were obtained in bulk form under ambient pressure, ,,, the obtained samples are usually multiphase mixtures except for Hg-1201-Ba. The difficulty in preparing a phase pure sample is mainly derived from a low thermal stability of the mercury compounds.…”

Section: Homologous Series Of Superconductors Stable Under High Pressurementioning

confidence: 99%

“…27,99 Furthermore, the T c of Hg-1223-Ba increases drastically with the application of hydrostatic pressure, reaching the value of 164 K at 31 GPa. 100 Although phases up to n ) 4 were obtained in bulk form under ambient pressure, 26,27,101,102 the obtained samples are usually multiphase mixtures except for Hg-1201-Ba. The difficulty in preparing a phase pure sample is mainly derived from a low thermal stability of the mercury compounds.…”

Section: M-12(n-1mentioning

confidence: 99%

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High-Pressure Synthesis of Homologous Series of High Critical Temperature (T_c) Superconductors

Takayama‐Muromachi

1998

Chem. Mater.

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Under high pressure, a variety of elements can be accommodated at the cation sites in the charge reservoirs of cuprate superconductors. Furthermore, high pressure allows the insertion of higher number of CuO2 planes (i.e., the insertion period of a charge reservoir becomes variable). Because of these effects, many new high critical temperature (T c) superconductors have been discovered under high pressure. In this paper, we will survey their structural and superconducting properties. The role of high pressure and its effect on the size mismatch between the charge reservoir and the CuO2 plane will also be discussed.

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Section: Homologous Series Of Superconductors Stable Under High Pressurementioning

confidence: 99%

Section: M-12(n-1mentioning

confidence: 99%

High-Pressure Synthesis of Homologous Series of High Critical Temperature (T_c) Superconductors

Takayama‐Muromachi

1998

Chem. Mater.

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“…We did not obtain a singlephase Hg-1234 sample by this method, though Usami et al 14 and Antipov et al 15 reported nearly single-phase Hg-1234 samples prepared by the two-pellet method and high-pressure method, respectively. However, the susceptibility curve clearly indicates the existence of the phase with a T c about 7 K lower than that of the Hg-1212 phase.…”

Section: Hg-1234 Phasementioning

confidence: 72%

“…They are (i) the precursor method in which samples are prepared from a mixture of HgO and Ba-Ca-Cu-O precursor, 8,9 (ii) single-step firing method starting from a mixture of monoxides (HgO, BaO, CaO, and CuO), [10][11][12] (iii) the two-pellet technique in which an Hg-Ba-Ca-Cu-O pellet and a Ba-Ca-Cu-O pellet are placed in a quartz tube, 13,14 (iv) high pressure synthesis technique, 15,16 etc. They are (i) the precursor method in which samples are prepared from a mixture of HgO and Ba-Ca-Cu-O precursor, 8,9 (ii) single-step firing method starting from a mixture of monoxides (HgO, BaO, CaO, and CuO), [10][11][12] (iii) the two-pellet technique in which an Hg-Ba-Ca-Cu-O pellet and a Ba-Ca-Cu-O pellet are placed in a quartz tube, 13,14 (iv) high pressure synthesis technique, 15,16 etc.…”

Section: Introductionmentioning

confidence: 99%

Temperature and time dependence of phase formation of HgBa₂Ca_n−1Cu_nO_2(n+1)+δ superconductors

et al. 1999

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We systematically studied the temperature and time dependence of phase formation of HgBa 2 Ca n21 Cu n O 2(n11)1d [Hg-12(n 2 1)n, n 1, 2, 3, 4] superconductors by a single step firing method. All samples were synthesized from high-purity HgO, BaO, CaO, and CuO in a sealed quartz tube. The phase formation of Hg-12(n 2 1)n was examined by both x-ray diffraction (XRD) analysis and dc susceptibility measurement. A single-phase HgBa 2 CuO 41d (Hg-1201) was obtained in a relatively wide temperature range (600-850 ± C), while single-phase HgBa 2 CaCu 2 O 618 (Hg-1212) and HgBa 2 Ca 2 Cu 3 O 81d (Hg-1223) were obtained only in narrow temperature and time ranges for the synthesis. The optimum temperatures for Hg-1212 and Hg-1223 were found to be 665 and 710 ± C, respectively, when the sintering time was fixed for about 50 h. The HgBa 2 Ca 3 Cu 4 O 101d (Hg-1234) phase was obtained as a mixture with Hg-1223.

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“…The first member HgBa 2 CuO 4+δ , of this HgBa 2 Ca n-1 Cu n O 2n+2+δ [Hg-12(n-1)n] series, was invented in 1993 by Putilin et al [3] exhibiting superconductivity at 94 K. Soon after, Schilling et al [1] observed superconductivity at 133.5 K in the Hg-Ba-Ca-CuO system and reported the formation of Hg-1212 and Hg-1223 phases. The highest values of T c 's, which were determined as the onset temperature of Meissner signal, were 97 K [4], 127 K [5], 135 K [6], and 123 K [7] for Hg-1201, Hg-1212, Hg-1223 and Hg-1234 phases, respectively. Particular importance of the series is very high T c values than other cuprate superconductors.…”

Section: Introductionmentioning

confidence: 99%

Room temperature electrochemical synthesis of Hg-1212 superconducting thin films

Shivagan

Shirage

Ekal

et al. 2003

Physica C: Superconductivity

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In the present investigation, the novel two-step electrochemical process of room temperature synthesis of Hg-1212 superconducting films has been developed and reported first time. Electrochemical parameters were optimized by studying cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA) for the deposition of Hg-Ba-Ca-Cu alloy at room temperature. Current time transient showed progressive growth with hemispheriodal granules, which were then revealed by scanning electron microscopy (SEM).Stoichiometric electrocrystallization to get Hg 1 Ba 2 Ca 1 Cu 2 O 6+x (Hg-1212) was completed by electrochemically intercalating oxygen species into Hg-Ba-Ca-Cu alloy at room temperature. The oxygen content in the samples was varied by varying the electrochemical oxidation period and the changes in the crystal structure, microstructure, and superconducting transition temperature (T c ) and critical current density (J c ) were recorded.The films oxidized for 28 min showed T c = 104.7 K with J c = 1.437 x 10 3 A/cm 2 . The dependence of superconducting parameters on oxygen content is correlated with structure property relations and reported in this paper. * The corresponding author

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Synthesis of HgBa2Ca3Cu4Oy under ambient pressure

Cited by 17 publications

References 14 publications

High-Pressure Synthesis of Homologous Series of High Critical Temperature (T_c) Superconductors

High-Pressure Synthesis of Homologous Series of High Critical Temperature (T_c) Superconductors

Temperature and time dependence of phase formation of HgBa₂Ca_n−1Cu_nO_2(n+1)+δ superconductors

Room temperature electrochemical synthesis of Hg-1212 superconducting thin films

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Synthesis of HgBa2Ca3Cu4Oy under ambient pressure

Cited by 17 publications

References 14 publications

High-Pressure Synthesis of Homologous Series of High Critical Temperature (Tc) Superconductors

High-Pressure Synthesis of Homologous Series of High Critical Temperature (Tc) Superconductors

Temperature and time dependence of phase formation of HgBa2Can−1CunO2(n+1)+δ superconductors

Room temperature electrochemical synthesis of Hg-1212 superconducting thin films

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High-Pressure Synthesis of Homologous Series of High Critical Temperature (T_c) Superconductors

High-Pressure Synthesis of Homologous Series of High Critical Temperature (T_c) Superconductors

Temperature and time dependence of phase formation of HgBa₂Ca_n−1Cu_nO_2(n+1)+δ superconductors