Origin of the 110-K superconducting transition in the Bi-Sr-Ca-Cu-O system
Jean‐Marie TarasconY. LePageL. H. GreeneB. G. BagleyP. BarbouxD. M. HwangG. W. HullW. R. McKinnonM. Giroud
135
Citation
9
Reference
10
Related Paper
Citation Trend
Abstract:
Superconducting critical transitions with an onset at 112 K and zero resistance at 107 K are obtained within the Bi-Sr-Ca-Cu-O system. The synthesis and formation of the 110-K superconducting phase using the 85-K material as a precursor is explained. The 110-K phase grows from the 85-K phase such that the resulting faceted crystal (a pseudomorph) can contain some of the 85-K phase in the core. With such a microstructure our magnetic data can be simply explained. A major structural difference between the 85- and 110-K materials is that the 85-K material can grow (relatively) large single crystals having long-range order whereas the 110-K material has only intermediate-range order (cryptocrystalline) of about 100-200 \AA{}.Keywords:
Pseudomorph
Pseudomorph
Cite
Citations (0)
Pseudomorph
Cite
Citations (0)
Morphological and chemical studies on high quartz-like trigonal dipyramids from voids in a medium-grained massive augelite-trolleite-andalusite-quartz rock from pyrophyllite deposit of the Hinomaru-Nako mine, Abu-cho, Yamaguchi Prefecture, western Japan, suggest they are trolleite-augelite pseudomorphs after berlinite. The occurrence indicates that the formation of berlinite was of hydrothermal origin and took place after the precipitation of pyrite, or under lower temperature and pressure conditions. Also, the existence of trolleite as a pseudomorph in voids is interpreted as proof that its formation does not always require high-pressure metamorphic conditions.
Pseudomorph
Andalusite
Pyrophyllite
Cite
Citations (2)
Pseudomorph
Crystal (programming language)
Cite
Citations (0)
Pseudomorph
Cite
Citations (4)
Summary Pseudomorphs after olivine in Markle basalt from Holyrood Park, Edinburgh, consist of an intimate mixture of hematite and chlorite, along with a small percentage of quartz. A definite relationship exists between the orientations of the two main constituents and is dependent upon their structures.
Pseudomorph
Cite
Citations (12)
(1968). Pseudomorphs—An Interesting Phase of Collecting. Rocks & Minerals: Vol. 43, No. 1, pp. 27-27.
Pseudomorph
Cite
Citations (0)
ABSTRACT Marine, mid‐Tertiary mudstones and siltstones of northwestern Oregon and western Washington contain unusual calcite pseudomorphs that commonly form the nuclei of carbonate concretions. These pseudomorphs typically have the shape of rhombic prisms, with dipyramidal terminations, that are much elongated due to multiple twinning (?). They appear similar to the glendonite pseudomorphs of New South Wales, however, their rhombic (orthorhombic?), prismatic form is at variance with the reported monoclinic form of the glendonite pseudomorphs. Internally, the pseudomorphs consist of granular calcite that takes the form of large ovoid crystals, radial or spherulitic crystals, fibrous but non‐radiating crystals, and mosaic crystals of clear spar. The original mineral, believed to be aragonite or one of the hydrated carbonates, probably formed in soft, organic‐rich mud, possibly in the burrows of marine organisms. Changes in physico‐chemical conditions caused early solution of the original mineral, leaving hollows or molds that quickly filled by precipitation of granular calcite. Judging from the low δC 13 values of the pseudomorphs, the carbonate carbon of this granular calcite was supplied from CO 2 produced through decay of local masses of organic matter. Concretionary calcite, supplied from a different source as shown by much higher δC 13 values, formed around the pseudomorphs. The entire pseudomorphic and concretionary process took place only a short distance below the depositional interface, prior to compaction and lithification of the host mudstone.
Pseudomorph
Lithification
Cite
Citations (35)
Mining for gold in the Bodaibo area, also referred to as the Lena Goldfields (Lenskie zolotyje Priiski), dates back to the nineteenth century when gold was first produced from placer deposits. At t...
Pseudomorph
Supergene (geology)
Cite
Citations (6)