Journal of Alloys and Compounds
Dear xxxx
Your paper has been reviewed by our referees. Comments from their report are shown below.
In their reports, the referee #2 advises against publication of your paper in the Journal of Alloys and Compounds. I am sorry to inform you that I cannot accept your paper for publication.
Yours sincerely,
xxxx
Editor
Journal of Alloys and Compounds
Reviewers' comments:
Reviewer #2: -Why to choose the A2CoNbO6 (A=Ca, Ba, Sr) as a material system of this work? The related references must be cited.
-I am unconvinced that the anomaly is associated with the transition of carriers from localized to free leading negative capacitance only by those data, something similar to the electronic ferroelectricity but not a typical relaxor ferroelectricity behavior. The author must provide more evidence to support it.
-Please cite more related references.
Reviewer #3: The authors report dielectric anomaly in Ba2CoNbO6 ceramics, on which topic the authors have recent discussions (cited reference 21-27). They conclude based on temperature dependent dielectric measurements, which is the novelty in this work, that one of the relaxations (low-temperature one)is a Maxwell-Wagner type caused by the surface-layer effect; while the other (high-temperature) is due to the hopping of oxygen vacancies. This is in sharp contradiction with their recent paper in J Am Ceram Soc (Cited ref 23)concluding that the low-temperature relaxation is polaronic from the hopping of self-trapped holes whereas the high-temperature one is a Maxwell-Wagner relaxation caused by the grain-boundary response. The authors provide evidences for their claim. £¨PS£ºref 23ÊÇÎÒµÄÎÄÕ½²µÄÊǵÍÎÂÇø¼ä£º190K-330KµÄÁ½¸ö³ÚÔ¥¹ý³Ì£¬¸úÎÒÏÖÔÚͶµÄÕâƪζÈÇø¼ä²»Ò»Ñù£¬ÏÖÔÚͶµÄÊǸßÎÂÇø¼äµÄ330K-500K£¬¾õµÃÉó¸åÈËζÈÇø¼äû¿´Çå³þѽ¾Í¿´ÕªÒªÁË£©
However, I would suggest the possibility of a phase transition [Journal of applied physics 94, 3451 (2003)] also, which could give rise to dielectric anomalies.
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Reviewer #4: a-Your paper is interesting and there are some new informations about dielectric relaxations of the Ba2CoNbO6 ferroelectric ceramics.
b-You have found interesting results that two relaxations: the low-temperature relaxation- Maxwell-Wagner relaxation caused by surface-layer effect and the high- temperature relaxation is attributed to the hopping of oxygen vacancies.
c.Besides,the dielectric anormaly located at 485K is associated with transition of cariers from locatized to free resulting negative capacitance someting simalar to the electronic ferroelectricity but not a typical rexar ferroelectricity behavior.
To me, this study is new and good.
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