Germanium crystal structure

In a further improvement, the NTD Ge spider-web bolometer developed by the Caltech/JPL group [69], and shown in Fig. 15.10, the absorber is a metallized silicon nitride spider-web structure, and the thermometer is a very small NTD germanium crystal [14], The spacing of the web pattern is much smaller than the wavelength, so it acts... 

X-ray Crystal Structure and GED Data of the Decamethylmetallocenes of Silicon, Germanium, Tin, and Lead... 

Fig. 12. Derivative curves of EPR in a highly dislocated As-doped germanium crystal grown in a H2 atmosphere. The magnetic field is oriented along the [100] direction. T= 2 K, /= 25.16 GHz. Note the sign reversal of the new lines as compared to the As-donor hyperfine structure. Dislocation density 2 x 104 cm 2. (Courtesy Pakulis and Jeffries, reprinted with permission from the American Physical Society, Pakulis, E.J., Jeffries, C D. Phys. Rev. Lett. (1981). 47, 1859.)...

The crystal structure of o-(Me2NCH2)C6H4GeMePhCl was determined by a single crystal X-ray diffration study. In this species germanium exists in a distorted trigonal bipyramidal coordination with a Ge—N bond distance of 2.479(11) A or 2.508 A (11), respectively (two slightly different conformations) (Figure 29). 

Although the crystal structure had a disordered Ge3 core, the EPR spectrum was consistent with the location of the unpaired electron on a single germanium. 

Fig. 14.3. The crystal structure of silicon, germanium and diamond, indicating the tetrahedral coordination.

Herman, F., and J. Callaway Electronic structure of the germanium crystal. 

The crystal structure of germanium is similar to that of diamonds and sihcon, and its semiconducting properties are also similar to silicon. 

Figure 5.1. Illustration of a unit cell of the diamond cubic lattice. The arrows designate the [001], [010], and [100] directions. Both silicon and germanium crystallize into the diamond cubic lattice structure, where each atom is bonded to four neighboring atoms in a tetrahedral geometry. Figure reproduced from Ref. [30] with permission.

Both silicon and germanium crystallize with the diamond structure, although with a substantially lower band gap [e.g. (kjmol-1) 106.8 (Si), 64.2 (Ge) cf. —580(C)], accounting... 

---