TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Ihrig, H. T1 - Valence change and phase stability of 3d-doped BaTiO3 annealed in oxygen and hydrogen. Hagemann, H. J.; Ihrig, H. JF - Physical Review B.. 20 (1979), H. 9 Y1 - 1979 SN - 1095-3795 SP - 3871 EP - 3878 ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Bachmann, P. K. A1 - Lade, H. A1 - Leers, D. T1 - Thermal properties of C/H-, C/H/O-, C/H/N- and C/H/X-grown polycrystalline CVD diamond. P. K. Bachmann, H. J. Hagemann, H. Lade, ... JF - Diamond and Related Material. Vol 4. (1995), H. Issue 5-6 Y1 - 1995 N1 - abstract online: SP - 820 EP - 826 PB - Elsevier Science CY - New York, NY [u.a.] ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Hero, A. A1 - Gonser, U. T1 - The valence change of Fe in BaTiO3 studied by Mößbauer effect and gravimetry. Hagemann, H. J.; Hero, A.; Gonser, U. JF - Physica Status Solidi (A) - Applied Research. 61 (1980) Y1 - 1980 SN - 0031-8965 SP - 63 EP - 72 ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Lade, H. A1 - Warnier, J. A1 - Wiechert, D. U. T1 - The performance of Depressed-Cladding Single-Mode Fibres with Different b/a Ratios. Hagemann, H.-J.; Lade, H.; Warnier, J.; Wiechert, D. U. JF - Journal of Lightwave Technology (J-LT) / Institute of Electrical and Electronics Engineers (IEEE). 9 (1991), H. 6 Y1 - 1991 SN - 0733-8724 SP - 689 EP - 694 ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Stumpe, R. A1 - Wagner, D. A1 - Bäuerle, D. T1 - The influence of contact effects on the dielectric behavior of diffuse phase transitions. Stumpe, R.; Wagner, D.; Bäuerle, D.; Hagemann, H. J. JF - Ferroelectrics : the international journal devoted to the theoretical, experimental, and applied aspects of ferroelectrics and related materials / Letters section. 4 (1985) Y1 - 1985 SN - 0731-5171 SP - 143 EP - 147 ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Hennings, D. T1 - Reversible Weight change of acceptor-doped BaTiO3. Hagemann, H. J.; Hennings, D. JF - Journal of the American Ceramic Society. 64 (1981) Y1 - 1981 SN - 0002-7820 SP - 590 EP - 594 ER - TY - JOUR A1 - Hagemann, Hans-Jürgen T1 - Reduction of hysteresis losses of ferroelectric BaTiO3. Hagemann, H. J. JF - Ferroelectrics. 22 (1978) Y1 - 1978 SN - 0015-0193 SP - 743 EP - 743 ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Geittner, P. A1 - Warnier, J. A1 - Weling, F. T1 - Reduction of geometric taper losses in the PCVD process. Geittner, P.; Hagemann, H. J.; Warnier, J.; Weling, F.; Wilson, H. JF - Electronics letters : an intern. publication / The Institution of Electrical Engineers. 21 (1985), H. 13 Y1 - 1985 SN - 0013-5194 SP - 870 EP - 871 ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Gudat, W. A1 - Kunz, C. T1 - Photoabsorption of alloys of Al with transition metals V, Fe, Ni and Cu and Pr near the Al L₂,₃-edge JF - Solid State Communications N2 - The onset of Al 2p transitions of VAl₃, FeAl, NiAl, NiAl₃, CuAl₂, PrAl₂ and the disordered alloys V-Al (16 at % Al, 28%, 41%), Fe-Al (11%) is shifted up to 1.1 eV. New pronounced structure develops close to the onset which for NiAl agrees with a density of states calculation by Connolly and Johnson. Y1 - 1974 SN - 0038-1098 U6 - http://dx.doi.org/10.1016/0038-1098(74)91165-X VL - 15 IS - 3 SP - 655 EP - 658 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Hagemann, Hans-Jürgen A1 - Gudat, W. A1 - Kunz, C. T1 - Photoabsorption coefficient of alloys of Al with transition metals V, Fe, Ni and Cu and Pr from 30 to 150 eV photon energy JF - Physica status solidi b N2 - The absorption coefficient of VAI3, FeAI, NiAI, NiAl2, CuAI2, PrAl2, and of disordered V–AI (16 at% AI, 28%, 41%) and Fe–AI (11%) alloys has been measured in the region of the M₂,₃ absorption of the transition metals and the Labsorption of AI. The strong changes of the AI spectrum in the region of the 100 eV maximum upon alloying are explained as another evidence of the EXAFS (extended X-ray absorption fine structure) nature of these structures. The broad, prominent absorption peaks from the 3p excitations in V and Fe and from the 4d excitations in Pr are influenced only little on allyoing and thus appear to be of atomic origin. The fine structure at the onset of the Pr 4d transitions is identical in the metal and the alloy but differs from that of Pr oxide. The only M₂,₃ edge which is detectably shifted is that of Ni (up to 2.1 eV), whereas the onset of the AI L₂,₃ edge is shifted in all the alloys (up to 1.1 eV). The shifts are interpreted in accordance with X-ray fluorescence and nuclear resonance measurements as changes of the density of states in the valence band of the alloys. Y1 - 1976 SN - 0031-8957 U6 - http://dx.doi.org/10.1002/pssb.2220740211 N1 - weitere ISSN 0370-1972 VL - 74 IS - 2 SP - 507 EP - 521 PB - Wiley-VCH CY - Berlin ER -