Hg vapor pressure, phase stability, and synthesis of Hg1−xBa2Can−1CunO2n+2+δ with n ≤ 3

Xue, Y. Y.; Meng, R.L.; Lin, Q. M.; Hickey, Benjamin; Sun, Yanyi; Chu, C. W.

doi:10.1016/s0921-4534(97)00376-6

Cited by 28 publications

(26 citation statements)

References 8 publications

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“…These levels of doping element contents were chosen from the viewpoint of optimum stability effect (for example [1], near 15-20% Pb) and sufficient influence on the superconductive properties of Hg-1223 (near 5% Fe, Cd). Fine homogeneous and reactive Hg-free precursor Ba 2 Ca 2 Cu 3 O 8+δ samples were obtained by the sol-gel method using acetic acid as a complex-forming agent and the acetates of Ba, Ca, Cd, Cu, Pb and Fe were used.…”

Section: Methodsmentioning

confidence: 99%

“…The doping with high-valence type Re, Pb and another element has beneficial effects on both the phase stability and superconducting properties of the HgBa 2 Ca 2 Cu 3 O 8+δ phase [1][2][3]. It was found that traces of moisture and/or carbon dioxide reduce the equilibrium mercury partial pressure P Hg of nonsuperconducting phase HgCaO 2 , which is a product of the synthesis reaction, whereas partial substitution of Re, Pb and Mo for Hg suppresses the P Hg of Hg-1223 at the synthesis process [1]. In addition, it is known that the doping with numerous elements considerably influences the critical current of the high temperature superconductivity (HTSC) system of superconducting grains coupled by the Josephson weak links.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, there are still scientific and applied problems concerning the phase stability, especially the presence of carbon dioxide and humidity. The doping with high-valence type Re, Pb and another element has beneficial effects on both the phase stability and superconducting properties of the HgBa 2 Ca 2 Cu 3 O 8+δ phase [1][2][3]. It was found that traces of moisture and/or carbon dioxide reduce the equilibrium mercury partial pressure P Hg of nonsuperconducting phase HgCaO 2 , which is a product of the synthesis reaction, whereas partial substitution of Re, Pb and Mo for Hg suppresses the P Hg of Hg-1223 at the synthesis process [1].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Properties of Doped Hg-Based Superconducting Copper Oxides

et al. 2010

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Synthesis of Pb, Fe and Cd doped Hg-based HgBa 2 Ca 2 Cu 3 O 8+δ (Hg-1223) superconducting ceramics was performed. Hg-free precursor Ba 2 Ca 2 Cu 3 O 8+δ with high chemical homogeneity and reactivity obtained by the sol-gel method was used. The superconducting and impurity phases were determined by means of scanning electron microscopy and microprobe analysis. The results of resistivity and magnetization measurements for different kinds of doped elements were presented.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and Properties of Doped Hg-Based Superconducting Copper Oxides

et al. 2010

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“…Although such techniques were effective, especially for the synthesis of the multi-layered members of the Hg-family of HTSCs, these approaches precluded the growth of sizable single crystals due to the limitations on sample volume. A different approach that utilized excess Hg vapor pressure was also effective in suppressing the evaporation of Hg and in improving the phase stability of the desired product 11,[53][54][55][56][57] . The required Hg pressures were reported to range from a few bars to a few tens of bars 11,56,57 , which was much more compatible with a large sample volume, making it feasible to grow sizable single crystals.…”

Section: Synthesismentioning

confidence: 99%

Growth and characterization of HgBa2CaCu2O6+d and HgBa2Ca2Cu3O8+d crystals

Wang,

Luo,

et al. 2018

Preprint

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We report the successful synthesis of single-crystalline cuprate superconductors HgBa2CaCu2O 6+δ and HgBa2Ca2Cu3O 8+δ . These compounds are well-known for their high optimal superconducting critical temperatures of Tc = 128 K and 134 K at ambient pressure, respectively, and for their challenging synthesis. Using a conventional quartz-tube encapsulation method and a two-layer encapsulation method that utilizes custom-built high-pressure furnaces, we are able to grow single crystals with linear dimensions up to several millimeters parallel to the CuO2 planes. Extended post-growth anneals are shown to lead to sharp superconducting transitions, indicative of high macroscopic homogeneity. X-ray diffraction and polarized Raman spectroscopy are identified as viable methods to resolve the seemingly unavoidable inter-growth of the two compounds. Our work helps to remove obstacles toward the study of these model cuprate systems with experimental probes that require sizable high-quality crystals.

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“…In the synthesis of bulk materials, phase equilibria as well as the content in the condensed phase of these compounds is controlled by adjusting their activity. [1,3,[6][7][8][9]. Big differences between p(T ) dependences in different publications have been recorded; thus these results could not be used as a general technique for the preparation of the single-phase samples.…”

Section: Introductionmentioning

confidence: 99%

Role of the mercury pressure during reaction synthesis of Hg(Re)-based superconducting films

Valeriánová¹,

Chromík

Odier

et al. 2007

Open Physics

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Thin films of mercury based superconductors were prepared on the R-plane sapphire with a CeO 2 buffer layer using a two step process involving the deposition of the Hg-free precursor and ex situ mercuration in the sealed quartz tube. For the thin film preparation, a method with no contact between the mercury source and the precursor film was used for mercuration. We studied the influence of the basic parameters of the mercuration (annealing time, temperature and partial pressure of the mercury) regarding the composition and superconducting properties of prepared Hg-based films to determine appropriate conditions for this mercuration method. We found out that an increased partial pressure of mercury inhibited the creation of the parasitic Re-based phase and supported the crystallization of the superconducting phase. The advantage of this mercuration method is higher reproducibility as well as its capability to prepare high quality thin large areas films.

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Hg vapor pressure, phase stability, and synthesis of Hg1−xBa2Can−1CunO2n+2+δ with n ≤ 3

Cited by 28 publications

References 8 publications

Preparation and Properties of Doped Hg-Based Superconducting Copper Oxides

Preparation and Properties of Doped Hg-Based Superconducting Copper Oxides

Growth and characterization of HgBa2CaCu2O6+d and HgBa2Ca2Cu3O8+d crystals

Role of the mercury pressure during reaction synthesis of Hg(Re)-based superconducting films

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