Tetragonal prism

Tetragonal prisms of ZrOCl2 -8H2 0 crystallize from hot hydrochloric acid solutions by cooling or by increasing the acidity in >32% hydrochloric acid transparent hexagonal plates are formed probably as ZrOCl2-2HClT0H2O (198). 

HojNijjBj P2./C Tetragonal prism, isolated borons + B pairs ... 

The alternation of temperature in a hydrothermal reaction was demonstrated to be crucial in changing the crystal phases or morphologies of nanomaterials. In the case of K2Cr207, when the reaction temperature was increased to 180 °C, K-OMS-2 microspheres consisting of nanoneedles were synthesized in contrast to the nanoduster arrays composed of tetragonal prism nanorods synthesized at 120 °C (Figure 8.1a-c). In the case of Na2Cr207, when the reaction temperature was 100 °C, Na-OMS-2 phase was formed. However, when the reaction temperature was... 

Here let us consider the structure of Bai+ Fe2S4 from the viewpoint of displacive modulated structures. As clearly seen from Fig. 2.38, Ba ions in the basic compound BaFe2S4 occupy regularly half of the face-capped tetragonal prisms (FCTP twelve coordinations) formed by S ions. The FCTP sites are at z = 0 and along the c-axis. The other sites for Ba ions are at z = j and I, where the Ba ions are eight coordinated by S ions (square anti-prism, SAP). The former sites are more stable than the latter ones, however, the occupation of all of the former sites seems to be impossible, due to the repulsive force between Ba ions. 

Fig. 2.51 Possible Ba sites in BaFe2S4. (a) Sites for Ba, twelve coordinated by S (face-capped tetragonal prism ) and eight coordinated by S (square anti-prism ). (b) Abbreviated drawing of (a). The mismatch distance Az is defined as the distance between the real position of Ba ions and the nearest position of FCTP.

Fig. 2. Variations of the computed magnetic anisotropies Ax with respect to the distortion of a cube toward (a) elongated and compressed tetragonal prisms, (b) a tetragonal antiprism and (c) a dodecahedron (adapted from Mironov...

The crystal structure of the anhydrous salt has been determined.118 The density of the tetragonal prisms is 5.00 gem-3 at ambient temperature. 

Figure 11.1. Schematic representation of typical silver (central atom) coordination environments with different coordination numbers and geometries (a) linear two-coordinate (b) triangular three-coordinate (c) T-shaped three-coordinate (d) square planar four-coordinate (e) tetrahedral four-coordinate (f) trigonal bipyramidal five-coordinate (g) tetragonal pyramidal five-coordinate (h) octahedral six-coordinate (i) trigonal prism six-coordinate (j) seven-coordinate (k) tetragonal prism eight-coordinate.

E, 2C4, C2 Tetragonal pyramid, tetragonal prism, pedion None known... 

E, 254, C2 Tetragonal disphenoid, tetragonal prism, pinacoid Ca2B(0H)4As04... 

Ditetragonal dipyramid, tetragonal dipyramid, ditetragonal prism, tetragonal prism, pinacoid Rutile... 

It readily absorbs ammonia gas, yielding the hexammoniate, NiS04.6XH3. If the anhydrous salt is dissolved in concentrated aqueous ammonia, however, a dihydrated tetrammoniate is produced, namely, NiS04.4XH3.2H20, which separates out in dark blue tetragonal prisms 9 which are unstable in moist air. 

Amm E, 2C4, C2, 2(Ty, 2o-d Ditetragonal pyramid, tetragonal pyramid, ditetragonal prism, tetragonal prism, pedion Pb2Cu(OH)4Cl2... 

A2m E, C2, 2C 2, 2o-d, 254 Tetragonal scalenohedron, tetragonal disphenoid, tetragonal bipyramid, ditetragonal prism, tetragonal prism, pinacoid Cu2peSnS4... 

Rhabdite is a crystalline phosphide of iron approximating in composition to (Ni, Fe)3P. It is found in meteorites in the form of minute tetragonal prisms.7 Density 6-3 to 6 8. 

Ferrous thiocarbonate hexammoniate, Fe2C2S7.6NH3.2H20, is prepared by warming a mixture of ferrous hydroxide, aqueous ammonia, and carbon disulphide. It yields black tetragonal prisms, with violet iridescence. On exposure to air it decomposes with heat, ferric hydroxide resulting.4... 

The change of outer sphere cation from tetramethylammonium to tetraethylammonium in the crystal structure of N(C2H5)4 4[Np(NCS)s] (3) leads to the variation in the structure of Np atom surrounding. In this case, the coordination polyhedron is the tetragonal prism, while the Np-N distances remain near the same, 2.39(2)-2.44(2) A. 

Hsematoxylin crystallises with 3 H2O in colourless tetragonal prisms [4], or with 1H2O in rhombic crystals. It dissolves sparingly in cold water, and is dissolved with facility by hot water, alcohol, and ether. It has a sweet taste. It melts in its water of crystallisation somewhat over 100°. Its solution turns a ray of polarised light towards the right [3]. 

---