TY - JOUR
T1 - Defect dipoles and electrical properties of magnesium B-site substituted sodium potassium niobates
AU - Li, Tangyuan
AU - Fan, Huiqing
AU - Long, Changbai
AU - Dong, Guangzhi
AU - Sun, Sheji
PY - 2014/10/5
Y1 - 2014/10/5
N2 - K0.5Na0.5Nb1-xMg xO3-3x/2 ceramics with the Mg 2+ acceptor substitution for the B-site Nb5+ were prepared by using the solid-state reaction process. K0.5Na 0.5Nb0.99Mg0.01O2.985 (x = 0.01) had the most pronounced double-loop-like characteristic due to the restoring force provided by the defect polarization (PD) associated with non-centric distributing the defect dipoles (MgNb′-VO)′, and the Rietveld refinement confirmed that it crystallized in the orthorhombic space group Bmm2 [a = 5.64306(7) Å, b = 3.94541(4) Å and c = 5.67406(7) Å] at room temperature. Furthermore, the P-E loops of K 0.5Na0.5Nb0.99Mg0.01O 2.985 dependence on annealing, aging, measuring frequency and measuring temperature were investigated, and the reinforcement in the double-loop-like characteristic was caused by a decrease in oxygen concentration, an increase in aging temperature, an increase in measuring frequency and a decrease in measuring temperature.
AB - K0.5Na0.5Nb1-xMg xO3-3x/2 ceramics with the Mg 2+ acceptor substitution for the B-site Nb5+ were prepared by using the solid-state reaction process. K0.5Na 0.5Nb0.99Mg0.01O2.985 (x = 0.01) had the most pronounced double-loop-like characteristic due to the restoring force provided by the defect polarization (PD) associated with non-centric distributing the defect dipoles (MgNb′-VO)′, and the Rietveld refinement confirmed that it crystallized in the orthorhombic space group Bmm2 [a = 5.64306(7) Å, b = 3.94541(4) Å and c = 5.67406(7) Å] at room temperature. Furthermore, the P-E loops of K 0.5Na0.5Nb0.99Mg0.01O 2.985 dependence on annealing, aging, measuring frequency and measuring temperature were investigated, and the reinforcement in the double-loop-like characteristic was caused by a decrease in oxygen concentration, an increase in aging temperature, an increase in measuring frequency and a decrease in measuring temperature.
KW - Defect dipoles
KW - Defect polarization
KW - Double-loop-like characteristic
KW - Mg acceptor-substituted sodium potassium niobates
KW - Oxygen vacancy concentration
UR - https://www.scopus.com/pages/publications/84901056686
U2 - 10.1016/j.jallcom.2014.04.024
DO - 10.1016/j.jallcom.2014.04.024
M3 - 文章
AN - SCOPUS:84901056686
SN - 0925-8388
VL - 609
SP - 60
EP - 67
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -