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	Dr. Egbert Keller Dipl.-Chemiker former staff member (wissenschaft- licher Angestellter), 1981-2011          former address: Kristallographie, Institut für Geo- und Umweltnaturwissenschaften Albert-Ludwigs-Universität Freiburg                Hermann-Herder-Str. 5 79104 Freiburg i.Br. / Germany e-mail address: eukell77@gmail.com		... wanna have a look at nice CRYSTALS grown by pupils?

Former fields of activity * crystal structure analysis * crystal chemistry * synthesis and characterization of    ternary and multinary solid-state    compounds * computer programming    ... a nostalgic look back to last    century software: SCHAKAL   Former and present hobbies * making noise (former) * taking naps (present)

The crystal structure of rocksalt-urea-water at 293 and at 117 K. Can you see the     difference ?

 

Most Recent Formatted Exudations E. Keller On the unit cell volume expansion in homogeneous series of isotypic structures of "ionic" compounds Z. Kristallogr. 231 (2016), 691-708. P. Schultz and E. Keller Strong Positive and Negative Deviations from Vegard′s Rule: X-Ray Powder Investigations of the three Quasi-Binary Phase Systems BiSX1-xYx (X,Y = Cl, Br, I) Acta Cryst. B70 (2014), 372-378. L. Rees-Isele, H.-P. Winkler and E. Keller In Search of the True Structure of the Sodium Chromium Alum II: Crystal Growth and Structure of the Double Salt NaCr(SO4)2(H2O)6 * (CH3OH)0.6(2) * (H2O)1.5(5) Z. Naturforsch. (2013), 68b, 1-7. L. Rees-Isele and E. Keller In Search of the True Structure of the Sodium Chromium Alum: Crystal Growth and Structure of the Double Salt NaCr(SO4)2(H2O)6 Z. Naturforsch. (2012), 67b, 1229-1234. H. P. Winkler, D. Topa and E. Keller Pb5In3Bi5S17 [ Pb4.94(3)In3.05(3)Bi4.99(3)S17 ] and its structural relationship with Pb4In3Bi7S18 Acta Cryst. (2012), C68, i45-i49. I. Reis, V. Krämer, A. Seiler, D. Topa and E. Keller Pb5.0(1)In8.4(1)Bi1.6(1)S20, a new quaternary lead indium bismuth sulfide Acta Cryst. (2012). C68, i12-i16. J. Fischer*, A. Ebinger, T. Hägi, B. Stawarczyk, A. Wenger, E. Keller Mold filling and dimensional accuracy of titanium castings in a spinel-based investment. Dental materials 25 (2009), 1376-1382. S. Müller, O. Schäfer and E. Keller Rock salt-Urea-Water (1/1/1) at 293 and 117 K Acta Cryst. C64 (2008), m300-m304 E. Keller and C. Röhr Structural changes within and between the two isotypic series ABiO2 (A = Na, K, Rb, Cs) and ASbO2 (A = K, Rb, Cs) Z. Kristallogr. 223 (2008), 431-440 E. Keller and V. Krämer Bi5O7Br and its structural relation to Bi5O7I Acta Cryst. C63 (2007), i109-i111 E. Keller and V. Krämer Crystal Structure of the Trihydrate of the Neuraminidase Inhibitor C15H28N4O4 (Peramivir), a Potential Influenza A/B and Avian-influenza (H5N1) Drug Z. Naturforsch. 62b (2007), 983-987 E. Keller, V. Krämer and C. A. Meyer Syntheses of the new compounds NaBi6O9X (X = Br, I) and the mixed systems Na0.77(3)K0.23(3)Bi6O9I, Rb0.91(3)K0.05(1)Na0.04(2)Bi6O9Br and Rb0.89(4)K0.05(1)Na0.06(3)Bi6O9I Mat. Res. Bull. 42 (2007), 1391-1394 E. Keller and V. Krämer "Ionic" size differences from bond-valence parameters and from ionic radii Acta Cryst. B62 (2006), 411-416 E. Keller and V. Krämer Experimental versus expected halide-ion size differences; structural changes in three series of isotypic bismuth chalcogenide halides Acta Cryst. B62 (2006), 417-423 E. Keller and V. Krämer A Strong Deviation from Vegard′s Rule: X-Ray Powder Investigations of the Three Quasi-Binary Phase Systems BiOX-BiOY (X,Y = Cl, Br, I). Z. Naturforsch. 60b (2005), 1255-1263.   plus a couple of additional papers produced in (or dealing with results obtained in) the 2nd millenium ... at Kristallographisches Institut der Universität Freiburg (selection) U. Eggenweiler, J. Ketterer, E. Keller, and V. Krämer* The crystal structure of α-Bi5O7I Z. Kristallogr. 216 (2001), 230-233. U. Eggenweiler, E. Keller, V. Krämer*, C.A. Meyer, and J. Ketterer Synthesis and crystal structure of the new isotypic compounds KBi6O9X (X = Cl, Br, I) Z. Kristallogr. 213 (1998), 377-381. H. Schwer, E. Keller, and V. Krämer* Crystal Structure and Twinning of KCd4Ga5S12 and Some Isotypic AB4C5X12 Compounds Z. Kristallogr. 204 (1993), 203-213. E. Keller Some Computer Drawings of Molecular and Solid-State Structures J. Appl. Crystallogr. 22 (1989), 19-22. J. Ketterer, E. Keller, and V. Krämer* Crystal Structure of Bismuth Oxide Iodide, β-Bi5O7I Z. Kristallogr. 172 (1985), 63-70. E. Keller Röntgenstrukturanalyse von Molekülen Chem. unserer Zeit 16 (1982), 71-88 and 116-123.     ... during postdoctoral time at the University of Konstanz (1980-1981) F. Wochner, E. Keller, and H. H. Brintzinger* Molecular Structure and Chemical Properties of a Binuclear Cyclopentadienylcobalt Nitrosyl Cation J. Organomet. Chem. 236 (1982), 267-272.     ... during postdoctoral time at the University of Freiburg (1978-1980) (selection) E. Keller und D. Wolters Benzonitril als 6-Elektronen-Donor-Ligand: Die Cluster Fe3(CO)2[μ3(h2)-NCC6H5] und Fe4(CO)12[μ4(h2)-NCC6H5] Chem. Ber. 117(1984), 1572-1582. E. Keller und H. Vahrenkamp* Eisen- und Cobalt-Cluster nach der Propen-Eliminierungs-Methode. Die Cluster Co4(CO)10[P(CH3)2CH2CHCH2]2 und Fe2Co(CO)8[μ-SCH3]2[μ-P(CH3)2] Chem. Ber 114 (1981), 1111-1123. E. Keller Kalottenmodelle Chem. unserer Zeit 14 (1980), 56-60.     ... from Ph.D. Thesis (1975-1978) (selection) E. Keller und H. Vahrenkamp* Ein unerwartet unsymmetrischer Dreikerncluster: Synthese und Struktur von [(CO)2Co-μ-PMe2]3 J. Organomet. Chem. 155 (1978), C41-C44. E. Keller und H. Vahrenkamp* Nucleophile Öffnung von Metall-Metall-Bindungen durch Phosphine: Strukturen zweier isomerer Reaktionsprodukte mit Fe-As-Mn- P-Gerüst Chem. Ber. 111, 65-71 (1978). E. Keller und H. Vahrenkamp* Co5(CO)11(PR2)3, ein neuer Typ von Fünfkerncluster Angew. Chem. 89 (1977), 738-739, Angew. Chem. Int. Ed. Engl. 16 (1977), 731-732.     ... from Diploma Thesis (1974-1975) E. Keller und H. Vahrenkamp* Einfluß der Liganden auf Metall-Metall-Bindungslängen: Die Kristallstruktur von FeCo(CO)7As(CH3)2 Chem. Ber. 109, 229-236 (1976). *Correspondence author (if not EK)