Two sets of La_(2)NiMnO_(6)ceramics with different B-site ordering degree were prepared and evaluated.The valence states of Ni^(2+)and Mn^(4+)were con-rmed,and the B-site ordering degree was estimated qualitatively us...Two sets of La_(2)NiMnO_(6)ceramics with different B-site ordering degree were prepared and evaluated.The valence states of Ni^(2+)and Mn^(4+)were con-rmed,and the B-site ordering degree was estimated qualitatively using magnetic and Raman analysis.The ordering of Ni^(2+)and Mn^(4+)was the primary origin for the relaxor-like behavior of the present ceramics.The ordering degree of B-site ions greatly affected the dielectric properties,i.e.,more ordered sample indicated higher dielectric constant.Meanwhile,the grain boundary layer capacitor(GBLC)effect was also activated but limited at the high temperatures and low frequencies.展开更多
基金supported by National Sci-ence Foundation of China under Grant numbers 50832005 and 50702049.
文摘Two sets of La_(2)NiMnO_(6)ceramics with different B-site ordering degree were prepared and evaluated.The valence states of Ni^(2+)and Mn^(4+)were con-rmed,and the B-site ordering degree was estimated qualitatively using magnetic and Raman analysis.The ordering of Ni^(2+)and Mn^(4+)was the primary origin for the relaxor-like behavior of the present ceramics.The ordering degree of B-site ions greatly affected the dielectric properties,i.e.,more ordered sample indicated higher dielectric constant.Meanwhile,the grain boundary layer capacitor(GBLC)effect was also activated but limited at the high temperatures and low frequencies.
