Is it possible to improve the quality of an MP3 file by converting to aiff?

itunes 11.0.4 (4)
I am contemplating the costs/benefits of purchasing digital downloads of mp3/mp4 files instead of purchasing actual cds.  I am aware that the MP files are compressed and are thus lower quality.  I have already purachased some digital music, from Amazon, and am now burning cds.  While creating playlists and burning, I noticed the option 'convert to aiff'.  I did this with one album.  I now have doubles of each track of that album, the original mp3 and the converted aiff.  The aiff file size of one song, for example, is 71MB compared to 12MB for the mp3 version.  
Did my aiff conversion do anything to improve the quality of my mp3 files?  If so, to what extent? E.g., how close is the quality to that of a cd?  The added file size of the aiff must represent some difference.  I am asking because I am skeptical that my converting an mp3 using itunes could improve the quality of that with which I began...i.e., the mp3 file.  Is this conversion effectively 'uncompressing' the mp3? 
If an aiff conversion increases quality, I see no reason to worry about mp3 compression.  It would make sense, economically, to purcahse mp3s and then convert to aiff, saving time, money, and transportation costs.
Finally, is there anyway to convert to aiff just for the purpose of creating one playlist and then burning so that I do not have to maintain double files in my library?  Thanks for answers.   

All you accomplished by converting the file to AIFF was to make the file much larger. As AnaMusic said, there's no way to put back the information that was lost during the process of compressing to MP3. If you want CD quality, you'll either need to buy the CDs and import them yourself or see if the album is available through one of the download stores that sell music in CD quality or better, such as iTrax, HDTracks or eClassical. They've only been able to license a small subset of what's available, but you might be fortunate.
Regards.

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