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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>E.J. Essene</dc:contributor>
  <dc:contributor>Lawrence M. Anovitz</dc:contributor>
  <dc:contributor>G.W. Metz</dc:contributor>
  <dc:contributor>E.F. Westrum Jr.</dc:contributor>
  <dc:contributor>B. S. Hemingway</dc:contributor>
  <dc:contributor>J.W. Valley</dc:contributor>
  <dc:creator>Z.D. Sharp</dc:creator>
  <dc:date>1986</dc:date>
  <dc:description>&lt;div id="preview-section-abstract"&gt;&lt;div id="abstracts" class="Abstracts u-font-serif text-s"&gt;&lt;div id="aep-abstract-id9" class="abstract author"&gt;&lt;div id="aep-abstract-sec-id10"&gt;&lt;p id="SP0005"&gt;The heat capacity of a natural monticellite (Ca&lt;sub&gt;1.00&lt;/sub&gt;Mg&lt;sub&gt;.09&lt;/sub&gt;Fe&lt;sub&gt;.91&lt;/sub&gt;Mn&lt;sub&gt;.01&lt;/sub&gt;Si&lt;sub&gt;0.99&lt;/sub&gt;O&lt;sub&gt;3.99&lt;/sub&gt;) measured between 9.6 and 343 K using intermittent-heating, adiabatic calorimetry yields&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C&lt;/i&gt;&lt;sub&gt;&lt;i&gt;p&lt;/i&gt;&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt;(298) and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;sub&gt;298&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;of 123.64 ± 0.18 and 109.44 ± 0.16&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;J&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;·&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;mol&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;i&gt;K&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;respectively. Extrapolation of this entropy value to end-member monticellite results in an&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;sub&gt;298&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;= 108.1 ± 0.2&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;J&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;·&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;mol&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;i&gt;K&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;. High-temperature heat-capacity data were measured between 340–1000 K with a differential scanning calorimeter. The high-temperature data were combined with the 290–350 K adiabatic values, extrapolated to 1700 K, and integrated to yield the following entropy equation for end-member monticellite (298–1700 K):&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;sub&gt;&lt;i&gt;T&lt;/i&gt;&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt;(&lt;i&gt;J&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;·&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;mol&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;i&gt;K&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;) =&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;sub&gt;298&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;+ 164.79 In&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;+ 15.337 · 10&lt;sup&gt;−3&lt;/sup&gt;&lt;i&gt;T&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;+ 22.791 · 10&lt;sup&gt;5&lt;/sup&gt;&lt;i&gt;T&lt;/i&gt;&lt;sup&gt;−2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;− 968.94. Phase equilibria in the CaO-MgO-SiO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;system were calculated from 973 to 1673 K and 0 to 12 kbar with these new data combined with existing data for akermanite (&lt;i&gt;Ak&lt;/i&gt;), diopside (&lt;i&gt;Di&lt;/i&gt;), forsterite (&lt;i&gt;Fo&lt;/i&gt;), merwinite (&lt;i&gt;Me&lt;/i&gt;) and wollastonite (&lt;i&gt;Wo&lt;/i&gt;). The location of the calculated reactions involving the phases&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Mo&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Fo&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;is affected by their mutual solid solution. A best fit of the thermodynamically generated curves to all experiments is made when the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;sub&gt;298&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Me&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;is 250.2 J · mol&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;K&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;less than the measured value of 253.2 J · mol&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;K&lt;sup&gt;−1&lt;/sup&gt;.&lt;/p&gt;&lt;p id="SP0010"&gt;A best fit to the reversals for the solid-solid and decarbonation reactions in the CaO-MgO-SiO&lt;sub&gt;2&lt;/sub&gt;-CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;system was obtained with the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;ΔG&lt;/i&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;sub&gt;298&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(&lt;i&gt;kJ&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;·&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;mole&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;) for the phases&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Ak&lt;/i&gt;(−3667),&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Di&lt;/i&gt;(−3025),&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Fo&lt;/i&gt;(−2051),&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Me&lt;/i&gt;(−4317) and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Mo&lt;/i&gt;(−2133). The two invariant points −&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Wo&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and −&lt;i&gt;Fo&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;for the solid-solid reactions are located at 1008 ± 5 K and 6.3 ± 0.1 kbar, and 1361 ± 10 K and 10.2 ± 0.2 kbar respectively. The location of the thermodynamically generated curves is in excellent agreement with most experimental data on decarbonation equilibria involving these phases.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;div id="preview-section-introduction"&gt;&lt;br&gt;&lt;/div&gt;&lt;div id="preview-section-snippets"&gt;&lt;br&gt;&lt;/div&gt;&lt;div id="preview-section-references"&gt;&lt;br&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0016-7037(86)90321-2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>The heat capacity of a natural monticellite and phase equilibria in the system CaO-MgO-SiO2-CO2</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>