2012

Erdem, Emre ; Schaab, Silke ; Jo, Wook ; Ozarowski, Andrew ; Van Tol, Johan ; Eichel, Rüdiger-A. (2012):
High-Frequency EPR Analysis of MnO2-Doped [Bi0.5Na0.5]TiO3-BaTiO3Piezoelectric Ceramics – Manganese Oxidation States and Materials ‘Hardening’.
In: Ferroelectrics, 428 (1), S. 116-121. ISSN 0015-0193,
[Artikel]

2011

Drahus, Michael D. ; Jakes, Peter ; Erdem, Emre ; Schaab, Silke ; Chen, Jun ; Ozerov, Mykhaylo ; Zvyagin, Sergei ; Eichel, Rüdiger-A. (2011):
Manganese-doped (1−x)BiScO_{3}–xPbTiO_{3} high-temperature ferroelectrics: Defect structure and mechanism of enhanced electric resistivity.
In: Physical Review B, 84 (6), S. 064113-1-064113-8. ISSN 1098-0121,
[Artikel]

Erdem, Emre ; Eichel, Rüdiger-A.
Lallart, Mickael (Hrsg.) (2011):
Impact of Defect Structure on ’Bulk’ and Nano-Scale Ferroelectrics.
In: smart materials, In: Ferroelectrics - Characterization and Modeling, S. 79-96, open access book, Intech open access publischer, ISBN 978-953-307-455-9,
[Buchkapitel]

Jakes, Peter ; Erdem, Emre ; Ozarowski, Andrew ; Van Tol, Johan ; Buckan, Ronny ; Mikhailova, Daria ; Ehrenberg, Helmut ; Eichel, Rüdiger-A. (2011):
Local coordination of Fe3+ in Li[Co0.98Fe0.02]O2 as cathode material for lithium ion batteries—multi-frequency EPR and Monte-Carlo Newman-superposition model analysis.
In: Physical Chemistry Chemical Physics, 13 (20), S. 9344-9352. ISSN 1463-9076,
[Artikel]

Aksel, Elena ; Jakes, Peter ; Erdem, Emre ; Smyth, Donald M. ; Ozarowski, Andrew ; Van Tol, Johan ; Jones, Jacob L. ; Eichel, Rüdiger-A. (2011):
Processing of Manganese-Doped [Bi0.5Na0.5]TiO3 Ferroelectrics: Reduction and Oxidation Reactions During Calcination and Sintering.
In: Journal of the American Ceramic Society, 94 (5), S. 1363-1367. ISSN 00027820,
[Artikel]

Drahus, Michael D. ; Jakes, Peter ; Erdem, Emre ; Eichel, Rüdiger-A. (2011):
Defect structure of the mixed ionic–electronic conducting Sr[Ti,Fe]Ox solid-solution system — Change in iron oxidation states and defect complexation.
In: Solid State Ionics, 184 (1), S. 47-51. ISSN 01672738,
[Artikel]

Jakes, Peter ; Erdem, Emre ; Eichel, Rüdiger-A. ; Jin, Li ; Damjanovic, Dragan (2011):
Position of defects with respect to domain walls in Fe[sup 3+]-doped Pb[Zr[sub 0.52]Ti[sub 0.48]]O[sub 3] piezoelectric ceramics.
In: Applied Physics Letters, 98 (7), S. 072907-1. ISSN 00036951,
[Artikel]

Eichel, Rüdiger-A. (2011):
Structural and dynamic properties of oxygen vacancies in perovskite oxides—analysis of defect chemistry by modern multi-frequency and pulsed EPR techniques.
In: Physical Chemistry Chemical Physics, 13 (2), S. 368-384. ISSN 1463-9076,
[Artikel]

Jo, Wook ; Ollagnier, Jean-Baptiste ; Park, Jong-Lo ; Anton, Eva-Maria ; Kwon, O-Jong ; Park, Chan ; Seo, Hyun-Ho ; Lee, Jong-Sook ; Erdem, Emre ; Eichel, Rüdiger-A. ; Rödel, Jürgen (2011):
CuO as a sintering additive for (Bi1/2Na1/2)TiO3–BaTiO3–(K0.5Na0.5)NbO3 lead-free piezoceramics.
In: Journal of the European Ceramic Society, 31 (12), S. 2107-217. ISSN 09552219,
[Artikel]

2010

Erdem, Emre ; Jakes, Peter ; Parashar, S. K. S. ; Kiraz, Kamil ; Somer, Mehmet ; Rüdiger, Andreas ; Eichel, Rüdiger-A. (2010):
Defect structure in aliovalently-doped and isovalently-substituted PbTiO3nano-powders.
In: Journal of Physics: Condensed Matter, 22 (34), S. 345901-1. ISSN 0953-8984,
[Artikel]

Aksel, Elena ; Erdem, Emre ; Jakes, Peter ; Jones, Jacob L. ; Eichel, Rüdiger-A. (2010):
Defect structure and materials “hardening” in Fe2O3-doped [Bi0.5Na0.5]TiO3 ferroelectrics.
In: Applied Physics Letters, 97 (1), S. 012903-1. ISSN 00036951,
[Artikel]

Jo, Wook ; Erdem, Emre ; Eichel, Rüdiger-A. ; Glaum, Julia ; Granzow, Torsten ; Damjanovic, Dragan ; Rödel, Jürgen (2010):
Effect of Nb-donor and Fe-acceptor dopants in (Bi[sub 1/2]Na[sub 1/2])TiO[sub 3]–BaTiO[sub 3]–(K[sub 0.5]Na[sub 0.5])NbO[sub 3] lead-free piezoceramics.
In: Journal of Applied Physics, 108 (1), S. 014110-1. ISSN 00218979,
[Artikel]

Erdem, Emre ; Eichel, Rüdiger-A. ; Fetzer, C. S. ; Dezsi, I. ; Lauterbach, Stefan ; Kleebe, Hans-Joachim ; Balogh, Adam G. (2010):
Site of incorporation and solubility for Fe ions in acceptor-doped PZT ceramics.
In: Journal of Applied Physics, 107 (5), S. 054109. AIP, ISSN 0021-8979,
DOI: 10.1063/1.3327436,
[Artikel]

Eichel, Rüdiger-A. ; Kungl, Hans (2010):
Recent developments and future perspectives of lead-free ferroelectrics.
In: Functional Materials Letters, 3 (1), S. 1-4. ISSN 1793-6047,
[Artikel]

Erdem, Emre ; Jakes, Peter ; Eichel, Rüdiger-A. ; Sinclair, Derek C. ; Pasha, Mahaboob ; Reaney, Ian M. (2010):
Formation of (Ti'Ti − V••O)• defect dipoles in BaTiO3 ceramics heat-treated under reduce oxygen partial-pressure.
In: Functional Materials Letters, 03 (01), S. 65-68. ISSN 1793-6047,
[Artikel]

Erdem, Emre ; Kiraz, Kamil ; Somer, Mehmet ; Eichel, Rüdiger-A. (2010):
Size effects in Fe3+-doped PbTiO3 nanocrystals—Formation and orientation of (Fe'Ti-V0°°)° defect-dipoles.
In: Journal of the European Ceramic Society, 30 (2), S. 289-293. ISSN 09552219,
[Artikel]

2009

Van Tol, J. ; Dinse, Klaus-Peter ; Kungl, Hans ; Hoffmann, Michael J. (2009):
Pulsed High-Frequency EPR Investigation of Gadolinium-Doped PbZrO3 and PbTiO3.
In: Applied Magnetic Resonance, 36 (2-4), S. 297-307. ISSN 0937-9347,
[Artikel]

Eichel, Rüdiger-A. ; Erünal, Ebru ; Drahus, Michael D. ; Smyth, Donald M. ; Van Tol, Johan ; Acker, Jérôme ; Kungl, Hans ; Hoffmann, Michael J. (2009):
Local variations in defect polarization and covalent bonding in ferroelectric Cu2+-doped PZT and KNN functional ceramics at the morphotropic phase boundary.
In: Physical Chemistry Chemical Physics, 11 (39), S. 8698-8705. ISSN 1463-9076,
[Artikel]

Eichel, Rüdiger-A. ; Drahus, Michael D. ; Jakes, Peter ; Erünal, Ebru ; Erdem, Emre ; Parashar, Sandeep Kumar ; Kungl, Hans ; Hoffmann, Michael J. (2009):
Defect structure and formation of defect complexes in Cu2+-modified metal oxides derived from a spin-Hamiltonian parameter analysis.
In: Molecular Physics, 107 (19), S. 1981. ISSN 0026-8976,
[Artikel]

Erdem, Emre ; Mass, Valentina ; Gembus, Armin ; Schulz, Armin ; Liebau-Kunzmann, Verena ; Fasel, Claudia ; Riedel, Ralf ; Eichel, Rüdiger-A. (2009):
Defect structure in lithium-doped polymer-derived SiCN ceramics characterized by Raman and electron paramagnetic resonance spectroscopy.
In: Physical Chemistry Chemical Physics, 11 (27), S. 5628-5633. Royal Society of Chemistry, ISSN 1463-9076,
[Artikel]

Kleebe, Hans-Joachim ; Lauterbach, Stefan ; Silvestroni, Laura ; Kungl, Hans ; Hoffmann, Michael J. ; Erdem, Emre ; Eichel, Rüdiger-A. (2009):
Formation of magnetic grains in ferroelectric Pb[Zr0.6Ti0.4]O3 ceramics doped with Fe3+ above the solubility limit.
In: Applied Physics Letters, 94 (14), S. 142901. AIP Publishing, ISSN 0003-6951,
DOI: 10.1063/1.3103313,
[Artikel]

Schneider, Jörg J. ; Hoffmann, Rudolf C. ; Engstler, Jörg ; Dilfer, Stefan ; Klyszcz, Andreas ; Erdem, Emre ; Jakes, Peter ; Eichel, Rüdiger-A. (2009):
Zinc oxide derived from single source precursor chemistry under chimie douce conditions: Formation pathway, defect chemistry and possible applications in thin film printing.
In: Journal of Materials Chemistry, 19 (10), S. 1449-1457. [Artikel]

2008

Zhang, Lixue ; Erdem, Emre ; Ren, Xiaobing ; Eichel, Rüdiger-A. (2008):
Reorientation of (Mn[sub Ti][sup ʺ]−V[sub O][sup ●●])[sup ×] defect dipoles in acceptor-modified BaTiO[sub 3] single crystals: An electron paramagnetic resonance study.
In: Applied Physics Letters, 93 (20), S. 202901-1-202901-3. ISSN 00036951,
[Artikel]

Erdem, Emre ; Drahus, Michael D. ; Eichel, Rüdiger-A. ; Kungl, Hans ; Hoffmann, Michael J. ; Ozarowski, Andrew ; Van Tol, Johan ; Brunel, Louis Claude (2008):
DEFECT STRUCTURE IN "SOFT" (Gd,Fe)-CODOPED PZT 52.5/47.5 PIEZOELECTRIC CERAMIC.
In: Functional Materials Letters, 1 (1), S. 7. ISSN 1793-6047,
[Artikel]

Erdem, Emre ; Eichel, Rüdiger-A. ; Kungl, Hans ; Hoffmann, Michael J. ; Ozarowski, Andrew ; Van Tol, Johan ; Brunei, L. C. (2008):
Characterization of (Fe_Zr,Ti-V_o ^ldrldr)^ldr defect dipoles in (La,Fe)-codoped PZT 52.5/47.5 piezoelectric ceramics by multifrequency electron paramagnetic resonance spectroscopy.
In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 55 (5), S. 1061-1068. ISSN 0885-3010,
[Artikel]

Eichel, Rüdiger-A. ; Erhart, Paul ; Träskelin, Petra ; Albe, Karsten ; Kungl, Hans ; Hoffmann, Michael J. (2008):
Defect-Dipole Formation in Copper-Doped PbTiO3 Ferroelectrics.
In: Physical Review Letters, 100 (9), S. 095504-1. American Physical Society, ISSN 0031-9007,
[Artikel]

Eichel, Rüdiger-A. (2008):
Characterization of Defect Structure in Acceptor-Modified Piezoelectric Ceramics by Multifrequency and Multipulse Electron Paramagnetic Resonance Spectroscopy.
In: Journal of the American Ceramic Society, 91 (3), S. 691-701. ISSN 0002-7820,
[Artikel]

Erdem, Emre ; Drahus, Michael ; Eichel, Rüdiger-A. ; Ozarowski, Andrew ; Van Tol, Johan ; Brunel, Louis Claude (2008):
Microstructural Characterization of the Manganese Functional Center Site in PbTiO3Ferroelectrics — Multi-Frequency Electron Paramagnetic Resonance and Newman Superposition Model Analysis.
In: Ferroelectrics, 363 (1), S. 39-49. ISSN 0015-0193,
[Artikel]

2007

Erhart, Paul ; Eichel, Rüdiger-A. ; Träskelin, Petra ; Albe, Karsten (2007):
Association of oxygen vacancies with impurity metal ions in lead titanate.
In: Physical review / B, 76 (17), S. 174116-1-174116-12. American Physical Society, [Artikel]

Erdem, Emre ; Eichel, Rüdiger-A. ; Kungl, Hans ; Hoffmann, Michael J. ; Ozarowski, Andrew ; Van Tol, Hans ; Brunel, Louis Claude (2007):
Local symmetry-reduction in tetragonal (La,Fe)-codoped Pb[Zr0.4Ti0.6]O3 piezoelectric ceramics.
In: Physica Scripta, (T129), S. 12-16. Institute of Physics Publishing (IOP), ISSN 0031-8949,
DOI: 10.1088/0031-8949/2007/T129/003,
[Artikel]

Eichel, Rüdiger-A. (2007):
Defect structure of oxide ferroelectrics—valence state, site of incorporation, mechanisms of charge compensation and internal bias fields.
In: Journal of Electroceramics, 19 (1), S. 11-23. ISSN 1385-3449,
[Artikel]

Schönau, Kristin A. ; Schmitt, Ljubomira A. ; Knapp, Michael ; Fuess, Hartmut ; Eichel, Rüdiger-A. ; Kungl, Hans ; Hoffmann, Michael J. (2007):
Nanodomain structure of Pb[Zr_{1−x}Ti_{x}]O_{3} at its morphotropic phase boundary: Investigations from local to average structure.
In: Physical Review B, 75 (18), S. 184117-1-184117-10. ISSN 1098-0121,
[Artikel]

Eichel, Rüdiger-A. ; Böttcher, Rolf (2007):
Characterization of the high-spin Mn2+-functional centre in BaTiO3 by means of right-angle wiggling electron paramagnetic resonance spectroscopy.
In: Molecular Physics, 105 (15-16), S. 2195-2201. ISSN 0026-8976,
[Artikel]

2006

Meštrić, Hrvoje ; Eichel, Rüdiger-A. ; Dinse, Klaus-Peter ; Ozarowski, Andrew ; Van Tol, Johan ; Brunel, Louis ; Kungl, Hans ; Hoffmann, Michael ; Schönau, Kristin ; Knapp, Michael ; Fuess, Hartmut (2006):
Iron-oxygen vacancy defect association in polycrystalline iron-modified PbZrO3 antiferroelectrics: Multifrequency electron paramagnetic resonance and Newman superposition model analysis.
In: Physical Review B, 73 (18), S. 184105-1-184105-10. ISSN 1098-0121,
[Artikel]

Eichel, Rüdiger-A. ; Meštrić, Hrvoje ; Kungl, Hans ; Hoffmann, Michael J. (2006):
Multifrequency electron paramagnetic resonance analysis of polycrystalline gadolinium-doped PbTiO[sub 3]—Charge compensation and site of incorporation.
In: Applied Physics Letters, 88 (12), S. 122506-1. ISSN 00036951,
[Artikel]

2005

Eichel, Rüdiger-A. ; Meštrić, Hrvoje ; Dinse, Klaus-Peter ; Ozarowski, Andrew ; Van Tol, Johan ; Brunel, Louis Claude ; Kungl, Hans ; Hoffmann, Michael J. (2005):
High-field/high-frequency EPR of paramagnetic functional centers in Cu2+- and Fe3+-modified polycrystalline Pb[ZrxTi1−x]O3 ferroelectrics.
In: Magnetic Resonance in Chemistry, 43 (S1), S. 166-173. ISSN 0749-1581,
[Artikel]

Meštrić, Hrvoje ; Eichel, Rüdiger-A. ; Koss, T. ; Dinse, Klaus-Peter ; Laubach, Sonja ; Laubach, Stefan ; Schmidt, Peter C. ; Schönau, Kristin A. ; Knapp, Michael ; Ehrenberg, Helmut (2005):
Iron-oxygen vacancy defect centers in PbTiO3 : Newman superposition model analysis and density functional calculations.
In: Physical Review B, 71 (13), S. 134109-1-134109-10. [Artikel]

Eichel, Rüdiger-A. ; Dinse, Klaus-Peter ; Kungl, Hans ; Hoffmann, Michael J. ; Ozarowski, Andrew ; Van Tol, Johan ; Brunel, Louis Claude (2005):
Exploring the morphotropic phase boundary in copper(II)-modified Pb[Zr0.54Ti0.46]O3 ferroelectrics.
In: Applied Physics A, 80 (1), S. 51-54. [Artikel]

2004

Meštrić, Hrvoje ; Eichel, Rüdiger-A. ; Dinse, Klaus-Peter ; Ozarowski, Andrew ; Van Tol, Johan ; Brunel, Louis Claude (2004):
High-frequency electron paramagnetic resonance investigation of the Fe[sup 3+] impurity center in polycrystalline PbTiO[sub 3] in its ferroelectric phase.
In: Journal of Applied Physics, 96 (12), S. 7440-1. ISSN 00218979,
[Artikel]

Eichel, Rüdiger-A. ; Kungl, Hans ; Hoffmann, Michael J. (2004):
Determination of functional center local environment in copper-modified Pb[Zr[sub 0.54]Ti[sub 0.46]]O[sub 3] ceramics.
In: Journal of Applied Physics, 95 (12), S. 8092-1. ISSN 00218979,
[Artikel]