The Mn-doped compounds Ge 3MnSb2Te7 and Ge3.5Mn0.5Sb2Te7 are prepared from stoichiometric mixtures of the elements (silica ampules, 950 C for 24 h, quenching and subsequent annealing at 550 C for 96 h). The samples are characterized by powder and single crystal XRD, SEM, TEM, EPR, electrical conductivity, Seebeck coefficient, and magnetic measurements. The two compounds crystallize in the cubic space group Fm3m with Z = 4. Mn doping reduces the electrical conductivity of Ge4Sb2Te7, while the Seebeck coefficient increases significantly. The thermoelectric figures of merit of the Mn doped samples do not reach significantly more than 0.5 at any temperature. -(WELZMILLER, S.; HEINKE, F.; HUTH, P.; BOTHMANN, G.; SCHEIDT, E.-W.; WAGNER, G.; SCHERER, W.; POEPPL, A.; OECKLER*, O.; J. Alloys Compd. 652 (2015) 74-82, http://dx.
2001 magnetic resonance, nuclear quadrupole resonance magnetic resonance, nuclear quadrupole resonance (solids and liquids) D 6560 31 -010 Elucidation of Structure and Location of V(IV) Ions in Heteropolyacid Catalysts H 4 PVMo 11 O 40 as Studied by Hyperfine Sublevel Correlation Spectroscopy and Pulsed Electron Nuclear Double Resonance at W-and X-Band Frequencies. -31 P and 1 H ENDOR results show that V(IV) ions are incorporated as vanadyl pentaaqua complexes [VO(H 2 O) 5 ] 2+ in the void space between the heteropolyanions in the hydrated heteropolyacid. The paramagnetic vanadium species are not incorporated at molybdenum sites in the Keggin structure of dehydrated H 4 PVMo 11 O 40 . The VO 2+ ions are coordinated to four or three outer oxygen atoms from one PVMo 11 O 40 4− heteropolyanion in a trigonal-pyramidal or slightly distorted square-pyramidal coordination geometry, respectively. -(POEPPL
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