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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Zhao Bin</dc:contributor>
  <dc:contributor>Bruce S. Hemingway</dc:contributor>
  <dc:contributor>Mark D. Barton</dc:contributor>
  <dc:creator>Richard A. Robie</dc:creator>
  <dc:date>1987</dc:date>
  <dc:description>&lt;p id=""&gt;The heat capacity of synthetic andradite garnet (Ca&lt;sub&gt;3&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;Si&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt;) was measured between 9.6 and 365.5 K by cryogenic adiabatic calorimetry and from 340 to 990 K by differential scanning calorimetry. At 298.15 K&lt;i&gt;C&lt;/i&gt;&lt;sup&gt;&lt;i&gt;o&lt;/i&gt;&lt;/sup&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;,&lt;i&gt;m&lt;/i&gt;&lt;/sub&gt;&amp;nbsp;and&amp;nbsp;&lt;i&gt;S&lt;/i&gt;&lt;sup&gt;&lt;i&gt;o&lt;/i&gt;&lt;/sup&gt;&lt;sub&gt;&lt;i&gt;m&lt;/i&gt;&lt;/sub&gt;&amp;nbsp;are 351.9 &amp;plusmn; 0.7 and 316.4 &amp;plusmn; 2.0 J/(mol&amp;middot;K), respectively.&lt;/p&gt;
&lt;p id=""&gt;Andradite has a &amp;lambda;-peak in&amp;nbsp;&lt;i&gt;C&lt;/i&gt;&lt;sup&gt;&lt;i&gt;o&lt;/i&gt;&lt;/sup&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;,&lt;i&gt;m&lt;/i&gt;&lt;/sub&gt;&amp;nbsp;with a maximum at 11.7 &amp;plusmn; 0.2 K which is presumably associated with the antiferromagnetic ordering of the magnetic moments of the Fe&lt;sup&gt;3+&lt;/sup&gt;&amp;nbsp;ions. The Gibbs free energy of formation,&lt;i&gt;&amp;Delta;&lt;/i&gt;&lt;sub&gt;&lt;i&gt;f&lt;/i&gt;&lt;/sub&gt;&lt;i&gt;G&lt;/i&gt;&lt;sup&gt;&lt;i&gt;o&lt;/i&gt;&lt;/sup&gt;&lt;sub&gt;&lt;i&gt;m&lt;/i&gt;&lt;/sub&gt;&amp;nbsp;(298.15 K) of andradite is &amp;minus;5414.8 &amp;plusmn; 5.5 kJ/mol and was obtained by combining our entropy and heat capacity data with the known breakdown of andradite to pseudowollastonite and hematite at &amp;asymp; 1410 to 1438 K. From a reexamination of the calcite + quartz = wollastonite equilibrium data we obtained&amp;nbsp;&lt;i&gt;&amp;Delta;&lt;/i&gt;&lt;sub&gt;&lt;i&gt;f&lt;/i&gt;&lt;/sub&gt;&lt;i&gt;H&lt;/i&gt;&lt;sup&gt;&lt;i&gt;o&lt;/i&gt;&lt;/sup&gt;&lt;sub&gt;&lt;i&gt;m&lt;/i&gt;&lt;/sub&gt;(298.15 K) = &amp;minus; 1634.5 &amp;plusmn; 1.8 kJ/mol for wollastonite.&lt;/p&gt;
&lt;p id=""&gt;Between 300 and 1000 K the molar heat capacity of andradite can be represented by the equation&amp;nbsp;&lt;i&gt;C&lt;/i&gt;&lt;sup&gt;&lt;i&gt;o&lt;/i&gt;&lt;/sup&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;,&lt;i&gt;m&lt;/i&gt;&lt;/sub&gt;&amp;nbsp;= 809.24 - 7.025 &amp;times; 10&amp;minus;2&lt;i&gt;T&lt;/i&gt;&amp;minus; 7.403 &amp;times; 10&lt;sup&gt;3&lt;/sup&gt;&lt;i&gt;T&lt;/i&gt;&amp;minus;0.5 &amp;minus; 6.789 &amp;times; 10&lt;sup&gt;5&lt;/sup&gt;&lt;i&gt;T&lt;/i&gt;&amp;minus;2. We have also used our thermochemical data for andradite to estimate the Gibbs free energy of formation of hedenbergite (CaFeSi&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;6&lt;/sub&gt;) for which we obtained&amp;nbsp;&lt;i&gt;&amp;Delta;&lt;/i&gt;&lt;sub&gt;&lt;i&gt;f&lt;/i&gt;&lt;/sub&gt;&lt;i&gt;G&lt;/i&gt;&lt;sup&gt;&lt;i&gt;o&lt;/i&gt;&lt;/sup&gt;&lt;sub&gt;&lt;i&gt;m&lt;/i&gt;&lt;/sub&gt;&amp;nbsp;(298.15&amp;nbsp;&lt;i&gt;K&lt;/i&gt;) = &amp;minus;2674.3 &amp;plusmn; 5.8 kJ/mol.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0016-7037(87)90271-7</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Heat capacity and thermodynamic properties of andradite garnet, Ca&lt;sub&gt;3&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;Si&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt;, between 10 and 1000 K and revised values for ΔfGom (298.15 K) of hedenbergite and wollastonite</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>