@article{OrgzallLorenzMikatetal.1998,
  author    = {Orgzall, Ingo and Lorenz, Bernd and Mikat, J{\"u}rgen E. R. and Reck, G{\"u}nter and Knochenhauer, Gerald and Schulz, Burkhard},
  title     = {Phase transition in 1,3,4-oxadiazole crystals under high pressure},
  year      = {1998},
  language  = {en}
}
@article{OrgzallLorenzMikatetal.1999,
  author    = {Orgzall, Ingo and Lorenz, Bernd and Mikat, J{\"u}rgen E. R. and Reck, G{\"u}nter and Knochenhauer, Gerald and Schulz, Burkhard},
  title     = {Phase transition in 1,3,4-oxadiazole crystals under high pressure},
  year      = {1999},
  abstract  = {Crystalline 2,5-di(4-nitrophenyl)-1,3,4-oxadiazole (DNO) has been investigated at pressures up to 5 GPa using Raman and optical spectroscopy as well as energy dispersive X-ray techniques. At ambient pressure DNO shows an orthorhombic unit cell (a = 0.5448 nm, b = 1.2758 nm, c = 1.9720 nm, density 1.513 g cm-3) with an appropriate space group Pbcn. From Raman spectroscopic investigations three phase transitions have been detected at 0.88, 1.28, and 2.2 GPa, respectively. These transitions have also been confirmed by absorption spectroscopy and X-ray measurements. Molecular modeling simulations have considerably contributed to the interpretation of the X-ray diffractograms. In general, the nearly flat structure of the oxadiazole molecule is preserved during the transitions. All subsequent structures are characterized by a stack-like arrangement of the DNO molecules. Only the mutual position of these molecular stacks changes due to the transformations so that this process may be described as a topotactical reaction. Phases II and III show a monoclinic symmetry with space group P21/c with cell parameters a = 1.990 nm, b = 0.500 nm, c = 1.240 nm, ß = 91.7°, density 1.681 g cm-3 (phase II, determined at 1. 1 GPa) and a = 1.890 nm, b = 0.510 nm, C = 1.242 nm, ß = 89.0°, density 1.733 g cm-3 (phase 111, determined at 2.0 GPa), respectively. The high-pressure phase IV stable at least up to 5 GPa shows again an orthorhombic structure with space group Pccn with corresponding cell parameters at 2.9 GPa: a = 0.465 nm, b = 1.920 nm, c = 1.230 nm and density 1.857 g cm-3 . For the first phase a blue pressure shift of the onset of absorption by about 0.032 eV GPa has been observed that may be explained by pressure influences on the electronic conjugation of the molecule. In the intermediate and high-pressure phases II-IV the onset of absorption shifts to increased wavelengths due to larger intermolecular interactions and enhanced excitation delocalization with decreasing intermolecular spacing.},
  language  = {en}
}
@article{OrgzallLorenzMikatetal.1997,
  author    = {Orgzall, Ingo and Lorenz, Bernd and Mikat, J{\"u}rgen E. R. and Dietel, Reinhard and Knochenhauer, Gerald and Schulz, Burkhard},
  title     = {Raman and IR spectroscopic investigation of aromatic 1,3,4-oxadiazole polymers and oligomers},
  year      = {1997},
  abstract  = {The molecular structure of poly(p-phenylene-1,3,4-oxadiazole) (POD) is investigated using i.r. and Raman spectroscopy. Both methods reveal characteristic differences for the a- and b-POD forms that are most obvious in the spectral region between 1500 and 1650 cm-1. The spectra for dimer and tetramer compounds already show the same features as found for longer chains. Based on molecular modelling calculations these differences are assigned to cis and trans conformations of the main chain segments. High pressure measurements show a linear shift of the Raman lines and support the result of the thermodynamic stability of the trans conformation.},
  language  = {en}
}
@article{OrgzallLorenz1994,
  author    = {Orgzall, Ingo and Lorenz, Bernd},
  title     = {Computer simulation of microstructures and geometric properties of a random system of penetrable disks : a model for compacted powders},
  year      = {1994},
  language  = {en}
}
@article{OrgzallLorenz1994,
  author    = {Orgzall, Ingo and Lorenz, Bernd},
  title     = {Kinetics of photoinduced phase transitions in sulfur below 10 Gpa},
  year      = {1994},
  language  = {en}
}
@article{OrgzallLorenz1994,
  author    = {Orgzall, Ingo and Lorenz, Bernd},
  title     = {Structure and fractal properties in geological crystallization processes due to nucleation and growth},
  year      = {1994},
  language  = {en}
}
@article{OrgzallLorenz1995,
  author    = {Orgzall, Ingo and Lorenz, Bernd},
  title     = {On the formation of photoinduced high pressure phases in sulfur below},
  year      = {1995},
  language  = {en}
}
@article{MikatOrgzallLorenzetal.1999,
  author    = {Mikat, J{\"u}rgen E. R. and Orgzall, Ingo and Lorenz, Bernd and Sapp, S. and Martin, C. R. and Burris, J. L. and Hochheimer, H. D.},
  title     = {High-pressure low-temperature electrical properties of template-synthesied polypyrrole at low synthesis temperature: Dimensional crossover under pressure},
  year      = {1999},
  language  = {en}
}
@article{LorenzTozerHochheimeretal.1994,
  author    = {Lorenz, Bernd and Tozer, S. W. and Hochheimer, H. D. and Menon, V. and Parthasarathy, R. and Martin, C. R.},
  title     = {Magnetoresistance of conducting polymers},
  year      = {1994},
  language  = {en}
}
@article{LorenzSpatzWeishauptetal.1994,
  author    = {Lorenz, Bernd and Spatz, J. P. and Weishaupt, K. and Hochheimer, H. D. and Menon, V. and Parthasarathy, R. and Martin, C. R. and Bechthold, Jeff and Hor, P.-H.},
  title     = {Observation of crossover from three to two dimensional variable range hopping in template synthesized polypyrrole and polyaniline},
  year      = {1994},
  language  = {en}
}
@article{LorenzSpatzHochheimeretal.1995,
  author    = {Lorenz, Bernd and Spatz, J. P. and Hochheimer, H. D. and Menon, V. and Parthasarathy, R. and Martin, C. R. and Bechthold, Jeff and Hor, P.-H.},
  title     = {High pressure conductivity study of template synthesized polypyrrole : observation of a crossover from three to one dimensional variable range hopping},
  year      = {1995},
  language  = {en}
}
@article{LorenzSpatzHochheimeretal.1994,
  author    = {Lorenz, Bernd and Spatz, J. P. and Hochheimer, H. D. and Menon, V. and Parthasarathy, R. and Martin, C. R. and Bechthold, Jeff and Hor, P.-H.},
  title     = {Dimensional crossover of the temperature dependence of the electrical conductivity of template synthesized polyaniline and polypyrrole},
  year      = {1994},
  language  = {en}
}
@article{LorenzSpatzDorhoutetal.1996,
  author    = {Lorenz, Bernd and Spatz, J. P. and Dorhout, P. K. and Casey, R. and D'Adamo, R. and Hochheimer, H. D.},
  title     = {High pressure absorption and Raman study of the quasilinear compound CsCuS6},
  year      = {1996},
  language  = {en}
}
@article{LorenzShenHolzapfel1994,
  author    = {Lorenz, Bernd and Shen, Yuen R. and Holzapfel, W. B.},
  title     = {Characterization of the new luminescence pressure sensor SrFCl:Sm2+},
  year      = {1994},
  language  = {en}
}
@article{LorenzPeunOrgzall1997,
  author    = {Lorenz, Bernd and Peun, T. and Orgzall, Ingo},
  title     = {Kinetic and thermodynamic investigation of cBN formation in the system BN-Mg3N2},
  year      = {1997},
  language  = {en}
}
@article{LorenzOrgzallDorhoutetal.1996,
  author    = {Lorenz, Bernd and Orgzall, Ingo and Dorhout, P. K. and Raymond, C. C. and Hochheimer, H. D.},
  title     = {Pressure induced phonon softening and structural phase transitions in Cs2MoS4},
  year      = {1996},
  language  = {en}
}
@article{LorenzOrgzallDorhoutetal.1997,
  author    = {Lorenz, Bernd and Orgzall, Ingo and Dorhout, P. K. and Raymond, C. C. and Brister, K. and Weishaupt, K. and D'Adamo, R. and Hochheimer, H. D.},
  title     = {High pressure X-ray diffraction, absorption, luminescence and Raman scattering study of Cs2MoS4},
  year      = {1997},
  language  = {en}
}
@article{LorenzOrgzallDorhoutetal.1996,
  author    = {Lorenz, Bernd and Orgzall, Ingo and Dorhout, P. K. and Casey, R. and D'Adamo, R. and Hochheimer, H. D.},
  title     = {High pressure optical and Raman investigations of the ternary compound Cs2MoS4},
  year      = {1996},
  language  = {en}
}
@article{LorenzOrgzall1994,
  author    = {Lorenz, Bernd and Orgzall, Ingo},
  title     = {Optical absorption studies of sulfur at pressure up to 20 Gpa},
  year      = {1994},
  language  = {en}
}
@article{LorenzOrgzall1995,
  author    = {Lorenz, Bernd and Orgzall, Ingo},
  title     = {Cluster shapes in the continuum description of percolating networks},
  year      = {1995},
  language  = {en}
}
@article{LorenzMillerHochheimeretal.1995,
  author    = {Lorenz, Bernd and Miller, A. J. and Hochheimer, H. D. and H{\"o}nle, W. and Li, T. and Ruoff, A. L.},
  title     = {High pressure phase transition in tetramethylammonium tetra bromocuprate},
  year      = {1995},
  language  = {en}
}
@article{LorenzMillerHochheimeretal.1994,
  author    = {Lorenz, Bernd and Miller, A. J. and Hochheimer, H. D. and H{\"o}nle, W.},
  title     = {The observation of a new high pressure phase transition in tetramethyl ammonium tetrabromocuprate},
  year      = {1994},
  language  = {en}
}
@article{LorenzHochheimerTozeretal.1995,
  author    = {Lorenz, Bernd and Hochheimer, H. D. and Tozer, S. W. and Menon, V. and Parthasarathy, R. and Martin, C. R. and Hor, P.-H.},
  title     = {High pressure low temperature investigation of template synthesized conducting polymers},
  year      = {1995},
  language  = {en}
}
@article{LorenzHochheimerHoenle1995,
  author    = {Lorenz, Bernd and Hochheimer, H. D. and H{\"o}nle, W.},
  title     = {The observation of a new high pressure phase transition in tetramethyl ammonium tetrabromocuprate},
  year      = {1995},
  language  = {en}
}
@article{HochheimerMenonParthasarathyetal.1994,
  author    = {Hochheimer, H. D. and Menon, V. and Parthasarathy, R. and Martin, C. R. and Bechthold, Jeff and Hor, P.-H. and Lorenz, Bernd and Spatz, J. P.},
  title     = {High pressure study of the temperature dependence of the conductivity of template synthesized polyaniline and polypyrrole},
  year      = {1994},
  language  = {en}
}
@article{HochheimerMenonParthasarathyetal.1994,
  author    = {Hochheimer, H. D. and Menon, V. and Parthasarathy, R. and Martin, C. R. and Bechthold, Jeff and Hor, P.-H. and Lorenz, Bernd and Spatz, J. P.},
  title     = {High pressure conductivity of template synthesized polypyrrole},
  year      = {1994},
  language  = {en}
}