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Layered structures, polyhedral sheets

The crystal structure of another borate mineral, garrelsite, NaBa3Si2B70i6(0H)4, has been determined. This structure has a three-dimensional framework of silicoborate sheets, and Ba—O polyhedral layers. The silicoborate sheets comprise a new type of silicoborate chain (with two types of alternating Si and B tetrahedral four-membered rings), the pentaborate anion B5O12, and octahedrally co-ordinated... [Pg.79]

Figure 2. Polyhedral representations of crystal structures ofMn oxide minerals with layer structures. (A) Lithiophorite. (B) Chalcophanite. (C) Na-rich bimessite-like phase showing disordered H20/Na (light color ball) sandwiched between the Mn octahedral sheets. Adapted from (8). Figure 2. Polyhedral representations of crystal structures ofMn oxide minerals with layer structures. (A) Lithiophorite. (B) Chalcophanite. (C) Na-rich bimessite-like phase showing disordered H20/Na (light color ball) sandwiched between the Mn octahedral sheets. Adapted from (8).
The carbon-arc plasma of extremely high temperatures and the presence of an electric field near the electrodes play important roles in the formation of nanotubes[ 1,2] and nanoparticles[3]. A nanoparticle is made up of concentric layers of closed graphitic sheets, leaving a nanoscale cavity in its center. Nanoparticles are also called nanopolyhedra because of their polyhedral shape, and are sometimes dubbed as nanoballs because of their hollow structure. [Pg.153]


See other pages where Layered structures, polyhedral sheets is mentioned: [Pg.378]    [Pg.378]    [Pg.834]    [Pg.153]    [Pg.157]    [Pg.129]    [Pg.519]    [Pg.115]    [Pg.9]    [Pg.109]    [Pg.132]    [Pg.124]   
See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.3 , Pg.6 , Pg.10 ]




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Layer structures

Layered structure

Layering structuration

Sheet structures

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