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	<title>
	Commentaires sur : Carbon polymorphism in shocked meteorites: Evidence for new natural ultrahard phases (our EPSL paper)	</title>
	<atom:link href="http://tristan.ferroir.fr/index.php/2010/02/05/carbon-polymorphism-in-shocked-meteorites-evidence-for-new-natural-ultrahard-phases-our-epsl-paper/feed/" rel="self" type="application/rss+xml" />
	<link>http://tristan.ferroir.fr/index.php/2010/02/05/carbon-polymorphism-in-shocked-meteorites-evidence-for-new-natural-ultrahard-phases-our-epsl-paper/</link>
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		Par : admin		</title>
		<link>http://tristan.ferroir.fr/index.php/2010/02/05/carbon-polymorphism-in-shocked-meteorites-evidence-for-new-natural-ultrahard-phases-our-epsl-paper/comment-page-1/#comment-17244</link>

		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Tue, 09 Feb 2010 10:04:23 +0000</pubDate>
		<guid isPermaLink="false">http://tristan.ferroir.fr/?p=189#comment-17244</guid>

					<description><![CDATA[Thank you very much for your comments. Your paper is really interesting because of the Raman spectra you present. We indeed think that the grain size of our phase is very small because our Raman spectra are very different from one point to another even if we move than less than a micron. However, as you read in the paper, we used a 514nm laser. If we compare to your spectra at the same wavelength, our is totally different which would mean that the bonding of our phase compared to the bonding of your CVD material is different.

It is however possible that we have related materials but it is nearly impossible that our phase has been formed by vapor deposition. We think that it is formed by shock. However, some bonding between the interface of nucleation and our phase could be the same since our nucleation sites are either diamond/graphite or silicate materials.]]></description>
			<content:encoded><![CDATA[<p>Thank you very much for your comments. Your paper is really interesting because of the Raman spectra you present. We indeed think that the grain size of our phase is very small because our Raman spectra are very different from one point to another even if we move than less than a micron. However, as you read in the paper, we used a 514nm laser. If we compare to your spectra at the same wavelength, our is totally different which would mean that the bonding of our phase compared to the bonding of your CVD material is different.</p>
<p>It is however possible that we have related materials but it is nearly impossible that our phase has been formed by vapor deposition. We think that it is formed by shock. However, some bonding between the interface of nucleation and our phase could be the same since our nucleation sites are either diamond/graphite or silicate materials.</p>
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		<title>
		Par : Dr. May		</title>
		<link>http://tristan.ferroir.fr/index.php/2010/02/05/carbon-polymorphism-in-shocked-meteorites-evidence-for-new-natural-ultrahard-phases-our-epsl-paper/comment-page-1/#comment-17243</link>

		<dc:creator><![CDATA[Dr. May]]></dc:creator>
		<pubDate>Tue, 09 Feb 2010 10:02:41 +0000</pubDate>
		<guid isPermaLink="false">http://tristan.ferroir.fr/?p=189#comment-17243</guid>

					<description><![CDATA[I read your article in Earth and Planetary Science Letters (Feb 15th 2010) with interest since I work in the area of CVD diamond deposition and characterisation.  A few years ago I published a paper in DRM concerning analysis of nanocrystalline CVD diamond films using 785 nm Raman, and found a complex spectrum consisting of dozens of &#039;new&#039; peaks.  The evidence seemed to suggest we were probing the interface/nucleation layer between the diamond film &#038; the Si substrate, where the diamond grain size was of the order of a few 10&#039;s of nm.
We were never able to identify most of these peaks, and vaguely assigned them to a combination of carbon polymorphs or defective diamond.

Interestingly, when I saw the list of peak positions in your two new polymorphs of carbon/diamond from the meteorite, many of the peak positions corresponded quite closely with the ones we saw in the CVD film (see Table 1 in our paper).  So I wonder if the meteorite diamond polymorphs and those  we saw at the nucleation layer of a CVD diamond film are the same, or closely related, materials?

best wishes,]]></description>
			<content:encoded><![CDATA[<p>I read your article in Earth and Planetary Science Letters (Feb 15th 2010) with interest since I work in the area of CVD diamond deposition and characterisation.  A few years ago I published a paper in DRM concerning analysis of nanocrystalline CVD diamond films using 785 nm Raman, and found a complex spectrum consisting of dozens of &lsquo;new&rsquo; peaks.  The evidence seemed to suggest we were probing the interface/nucleation layer between the diamond film &amp; the Si substrate, where the diamond grain size was of the order of a few 10&rsquo;s of nm.<br />
We were never able to identify most of these peaks, and vaguely assigned them to a combination of carbon polymorphs or defective diamond.</p>
<p>Interestingly, when I saw the list of peak positions in your two new polymorphs of carbon/diamond from the meteorite, many of the peak positions corresponded quite closely with the ones we saw in the CVD film (see Table 1 in our paper).  So I wonder if the meteorite diamond polymorphs and those  we saw at the nucleation layer of a CVD diamond film are the same, or closely related, materials?</p>
<p>best wishes,</p>
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