Lead-Free AE Sensor Based on BZT–BCT Ceramics
and In-Sung Kim 1,*Round 1
Reviewer 1 Report
The authors have submitted a manuscript of=n Lead-free AE Sensor based on BZT–BCT Ceramics. I have few comments before this can be considered further.
There are some spelling mistakes and also the grammar needs to be rechecked.
Looking at the SEM image, I can see porosity, Authors did mention porosity, however, density should also be provided.
Table 1 displays the resonant frequency and other piezoelectric parameters, however, authors did not mention the reason for the reason for decreasing resonant frequency with increasing volume.
Page 4 line 137, please provide a comparison for excellent electromechanical coupling.
Page 5, author stated there is a difference between simulation and measured values, the reason provided is very vague, please provide a clear reason of this difference and explain.
In experimental section, authors mentioned the sintering time was in the range, please explain why is this the case. Also, etyl alcohol is more commonly used as ethanol.
How did author come up with a poling voltage of 5.9436 kV/mm. Please narrow it down to either 6 or provide a justification why such precise voltage is needed, how was this maintained and effect on the samples.
Dielectric constant is a materials property and should stay the same. Authors mentioned that by varying the D/T ratio, it changed., how would author justify this phenomenon.
Conslusion must be improved, it is not an abstract.
Genrelly speaking, the paper reports data and the key scientific understanding is missing in most part of the paper.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Please find this reviewer's opinion on the manuscript in the Report attached as a PDF file.
Comments for author File: Comments.pdf
Author Response
Please see the attachment
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The authors have successfully addressed my comments and am happy with the changes.
Author Response
Your comments have helped me to improve my manuscript more logically and scientifically.
Thanks for your insightful advice.
