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- Publications
- Influence
Defect chemistry and electrical characteristics of undoped and Mn-doped ZnO
- Jiaping Han, P. Q. Mantas, Ana M. R. Senos
- Materials Science
- 2002
Abstract Undoped and Mn-doped ZnO samples were sintered at 1373, 1473, and 1573 K, for 2 h, in air, and then quenched to room temperature. Defect concentrations in these samples at the sintering… Expand
Interweaving domain configurations in [001]-poled rhombohedral phase 0.68Pb(Mg1/3Nb2/3)O3–0.32PbTiO3 single crystals
- Jiaping Han, W. Cao
- Physics
- 2 September 2003
Domain structures in [001]-poled rhombohedral phase 0.68Pb(Mg1/3Nb2/3)O3–0.32PbTiO3 single crystals have been investigated using polarized light microcopy. It was found that the observed domain… Expand
Densification and grain growth of Al-doped ZnO
- Jiaping Han, P. Mantas, Ana M. R. Senos
- Materials Science
- 1 February 2001
Grain growth in Mn-doped ZnO
- Jiaping Han, P. Mantas, Ana M. R. Senos
- Materials Science
- 2000
Abstract Grain growth in ZnO doped with 0.1 to 1.2 mol% Mn was investigated during isothermal sintering from 1100 to 1300°C in air. Mn doping promotes the grain growth of ZnO during sintering, and… Expand
Deep donors in polycrystalline Mn-doped ZnO
- Jiaping Han, Ana M. R. Senos, P. Q. Mantas
- Materials Science
- 28 April 2002
In a previous work, significant varistor behaviour was found in polycrystalline ZnO with Mn as the only additive. In the present work, the admittance spectra of these Mn-doped ZnO samples were… Expand
Varistor behaviour of Mn-doped ZnO ceramics
- Jiaping Han, Ana M. R. Senos, P. Q. Mantas
- Materials Science
- 1 September 2002
Abstract Polycrystalline ZnO doped with MnO, from 0.1 to 0.6 mol%, was prepared by conventional ceramic processing. The effect of Mn doping on the electrical properties of ZnO was investigated.… Expand
Hopping conduction in Mn-doped ZnO
- Jiaping Han, M. Shen, W. Cao, Ana M. R. Senos, P. Q. Mantas
- Physics
- 6 January 2003
The dc and ac conductivities of Mn-doped ZnO were investigated at temperatures from 10 to 100 K. The temperature dependence of the dc conductivity from 10 to 100 K shows an abrupt change at ∼18 K,… Expand
Effect of Al and Mn doping on the electrical conductivity of ZnO
- Jiaping Han, P. Mantas, Ana M. R. Senos
- Materials Science
- 2001
Abstract Samples of Al-doped and Mn-doped ZnO with a doping level up to 1.2 mol% were sintered at temperatures from 1100 to 1400°C in air. dc Electrical conductivities of these samples at room… Expand
Electric field effects on the phase transitions in [001]-oriented ( 1 − x ) Pb ( Mg 1 / 3 Nb 2 / 3 ) O 3 − x PbTiO 3 single crystals with compositions near the morphotropic phase boundary
- Jiaping Han, W. Cao
- Materials Science
- 7 October 2003
Dielectric behavior and phase transitions of [001] oriented (1-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 single crystals with x=29, 31, 32, and 33% were investigated by impedance measurements and high… Expand
Synthesis and dielectric properties of tungsten-based complex perovskites
- D. Khalyavin, Jiaping Han, Ana M. R. Senos, P. Mantas
- Materials Science
- 1 November 2003
Ba 2 MeWO 6 (Me = Mg, Ni, Zn) double perovskites were prepared by the conventional solid-state reaction in a wide temperature range. Single-phase ceramics were obtained only at low temperatures… Expand