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Triclinic MgMo04 . Hz0 and the isomorphous MgW04 . Hz0 have been prepared under mild hydrothermal conditions in single crystalline form and the crystal structure of MgMo04 . Hz0 has been determined by X-ray diffraction. The structure is compared to a model deduced earlier for MgWO., . Hz0 from topotaxy data, with which the general topology agrees, but there is an important difference in the orientation of Moo,-tetrahedra. The X-ray powder diffraction data, thermal dehydration behavior, as well as the luminescence properties are reported and the latter compared with data of related phases. Crystal data are: Triclinic, space group P -1; MgMoOa . HzO: a = 5.665 A, b = 5.869 A, c = 6.875&a= 100.80",/3 = 95.05",y= 106.57";MgWO~~H~O:a = 5.681&b = 5.887&c= 6.870& a = 100.85", p = %.44", y = 106.55". D

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We present a fiber coupled transceiver head for terahertz (THz) time-domain reflection measurements. The monolithically integrated transceiver chip is based on iron (Fe) doped In0.53Ga0.47As (InGaAs:Fe) grown by molecular beam epitaxy. Due to its ultrashort electron lifetime and high mobility, InGaAs:Fe is very well suited as both THz emitter and receiver. A record THz bandwidth of 6.5 THz and a peak dynamic range of up to 75 dB are achieved. In addition, we present THz imaging in reflection geometry with a spatial resolution as good as 130 µm. Hence, this THz transceiver is a promising device for industrial THz sensing applications.