| Pb(${Mg_{1/3}}{Nb_{2/3}}$)$O_3$계 고용체의 B자리 양이온 질서배열구조 |
| 차석배, 김병국, 제해준 |
| 한국과학기술연구원 재료연구부 |
| Ordering Structures of B-Site Cations in Pb(${Mg_{1/3}}{Nb_{2/3}}$)$O_3$-Based Solid Solutions |
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| ABSTRACT |
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Single phae Pb(Mg1/3Nb2/3)O3-based solid solutions, the Mg2+ of which are replaced by 20mol% of Ni2+, Zn2+, Cd2+, and the Pb2+ of which are replaced by 0∼20 mol% of La3+, were synthesized and their ordering structures of B-site cations were investigated by XRD and TEM. The B'-site cations (Mg2+, Ni2+, Zn2+, Cd2+) are disordered while these B'-site cations and the B"-site cations (Nb5+) are nonstoichiometrically 1:1 ordered within the ordered nano-domains dispersed in the Nb5+-rich disordered matrix. The charge imbalance between the B'-rich ordered nano-domains and the B"-rich disordered matrix are compensated by the doping of electron donor such as La3+, which enhances the degree of nonstoichiometric 1:1 ordering. For a given La3+ content, the degree of nonstoichiometric 1:1 ordering increases as the average ionic size difference between the B'-and B"-site cations increases, Ni2+ |
| Key words:
1:1 ordering, Lead-based complex perovskite, Solid solution, Ionic radius difference, Relaxor |
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