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Redetermination of terbium scandate, revealing a defect-type perovskite derivative
2008, Veličkov, B., Kahlenberg, V., Bertram, R., Uecker, R.
The crystal structure of terbium(III) scandate(III), with ideal formula TbScO3, has been reported previously on the basis of powder diffraction data [Liferovich & Mitchell (2004). J. Solid State Chem. 177, 2188-2197]. The current data were obtained from single crystals grown by the Czochralski method and show an improvement in the precision of the geometric parameters. Moreover, inductively coupled plasma optical emission spectrometry studies resulted in a nonstoichiometric composition of the title compound. Site-occupancy refinements based on diffraction data support the idea of a Tb deficiency on the A site (inducing O defects on the O2 position). The crystallochemical formula of the investigated sample thus may be written as A(0.04Tb0.96) BScO2.94. In the title compound, Tb occupies the eightfold- coordinated sites (site symmetry m) and Sc the centres of corner-sharing [ScO6] octa-hedra (site symmetry ). The mean bond lengths and site distortions fit well into the data of the remaining lanthanoid scandates in the series from DyScO3 to NdScO3. A linear structural evolution with the size of the lanthanoid from DyScO3 to NdScO3 can be predicted.
Crystal structure of strontium praseodum gallium oxide, SrPrGaO4
2000, Gesing, T.M., Uecker, R., Buhl, J.-C.
GaO4PrSr, tetragonal, I4/mmm (No. 139), a = 3.822(1) Å, c = 12.622(2) Å, V = 184.4 Å3, Z = 2, Rgt(F) = 0.028, wR(F2) = 0.082, T = 293 K.
Crystal structure of strontium praseodym trigallium heptaoxide, (Sr0.5Pr0.5)2Ga3O7
1999, Gesing, T.M., Uecker, R., Buhl, J.-C.
Ga3O7PrSr, tetragonal, P4̄21m (No. 113), a = 8.0198(2) Å, c = 5.2991 (1) Å, V = 340.8 Å3, Z = 2, R(P) = 0.026, wR(P) = 0.040, R(I) = 0.025, T = 295 K.
Crystal structure of praseodym gallate, Pr4Ga2O9
1999, Gesing, T.M., Uecker, R., Buhl, J.-C.
Ga2O9Pr4, monoclinic, P121/c1 (No. 14), a = 7.8256(4) Å, b = 11.0322(5) Å, c = 11.4959(7) Å, β = 109.187(3)°, V = 937.4 Å3, Z = 4, R(P) = 0.026, wR(P) = 0.034, R(I)= 0.033, T = 295 K.
Refinement of the crystal structure of praseodymium orthoscandate, PrScO3
2009, Gesing, T.M., Uecker, R., Buhl, J.-C.
O3PrSc, Prima (no. 62), a = 5.780(1) Å, b = 8.025(2) Å, c = 5.608(1) Å, V= 260.1 Å3, Z = 4, R gr(F) = 0.025, wRref(F2) = 0.060, T= 298 K. © by Oldenbourg Wissenschaftsverlag, München.
Crystal structure of strontium praseodym aluminate, SrPrAlO4
1999, Gesing, T.M., Uecker, R., Buhl, J.-C.
AlO4PrSr, tetragonal, I4/mmm (No. 139), a = 3.736(1) Å, c = 12.532(3) Å, V = 174.9 Å3, Z = 2, Rgt(F) = 0.010, wR(F2); = 0.021, T = 293 K.
Crystal structure of distrontium lanthanum gallium pentaoxide, Sr2LaGaO5
2000, Gesing, T.M., Uecker, R., Buhl, J.-C.
GaLaO5Sr2, tetragonal, I4/mcm (No. 140), a = 6.9339(4) Å, c = 11.2823(8) Å, V= 542.4 Å3, Z = 4, R(P) = 0.018, wR(P) = 0.027, R(I) = 0.031, T= 295 K.
Crystal structure of samarium-strontium-calcium orthoaluminotantalate, (Sm0.40Sr0.50Ca0.10)(Al0.70Ta 0.30)O3
2010, Gesing, T.M., Uecker, R., Zheng, W., Buhl, J.-C.
Al2.90Ca0.45O12Sm 1.59Sr2Ta1.10, tetragonal, I4 (no. 82), a = 5.4174(8) Å, c = 7.643(2) Å, V = 224.3 Å3, Z = 1, Rgt(F) = 0.039, wRref(F 2) = 0.1258 , T = 298 K. © 2014 Oldenbourg Wissenschaftsverlag, München.
Crystal structure of distrontium praseodym gallium pentaoxide, Sr2PrGaO5
1999, Gesing, T.M., Uecker, R., Buhl, J.-C.
GaO5PrSr2, tetragonal, I4/mcm (No. 140), a = 6.8441(2) Å, c = 11.2534(4) Å, V = 527.1 Å3, Z = 4, R(P) = 0.035, wR(P) = 0.052, R(I) = 0.038, T = 295 K. © by Oldenbourg Wissenschaftsverlag.