<?xml version='1.0' encoding='utf-8'?>
<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>A.H. Treiman</dc:contributor>
  <dc:contributor>E.J. Essene</dc:contributor>
  <dc:contributor>B. S. Hemingway</dc:contributor>
  <dc:contributor>E.F. Westrum Jr.</dc:contributor>
  <dc:contributor>V.J. Wall</dc:contributor>
  <dc:contributor>R. Burriel</dc:contributor>
  <dc:contributor>S.R. Bohlen</dc:contributor>
  <dc:creator>Lawrence M. Anovitz</dc:creator>
  <dc:date>1985</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Low temperature adiabatic calorimetry and high temperature differential scanning calorimetry have been used to measure the heat-capacity of ilmenite (FeTiO&lt;/span&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;span&gt;) from 5 to 1000 K. These measurements yield&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;= 108.9&amp;nbsp;&lt;/span&gt;&lt;i&gt;J&lt;/i&gt;&lt;span&gt;/(&lt;/span&gt;&lt;i&gt;mol&lt;/i&gt;&lt;span&gt;&amp;nbsp;·&amp;nbsp;&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;span&gt;). Calculations from published experimental data on the reduction of ilmenite yield&amp;nbsp;&lt;/span&gt;&lt;i&gt;Δ&lt;/i&gt;&lt;sub&gt;298&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;span&gt;(&lt;/span&gt;&lt;i&gt;I&lt;/i&gt;&lt;span&gt;1) = −1153.9&amp;nbsp;&lt;/span&gt;&lt;i&gt;kJ&lt;/i&gt;&lt;span&gt;/(&lt;/span&gt;&lt;i&gt;mol&lt;/i&gt;&lt;span&gt;&amp;nbsp;·&amp;nbsp;&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;span&gt;). These new data, combined with available experimental and thermodynamic data for other phases, have been used to calculate phase equilibria in the system Fe-Ti-O. Calculations for the subsystem Ti-O show that extremely low values of&amp;nbsp;&lt;/span&gt;&lt;span class="math"&gt;&lt;span id="MathJax-Element-1-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;&amp;amp;#x192;O&lt;/mtext&gt;&lt;msub&gt;&lt;mi&gt;&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;"&gt;ƒ&lt;span class="MJX_Assistive_MathML"&gt;ƒO2&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;are necessary to stabilize TiO, the mineral hongquiite reported from the Tao district in China. This mineral may not be TiO, and it should be re-examined for substitution of other elements such as N or C. Consideration of solid-solution models for phases in the system Fe-Ti-O allows derivation of a new thermometer/oxybarometer for assemblages of ferropseudobrookite-pseudobrookite&lt;/span&gt;&lt;sub&gt;ss&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and hematite-ilmenite&lt;/span&gt;&lt;sub&gt;ss&lt;/sub&gt;&lt;span&gt;. Preliminary application of this new thermometer/oxybarometer to lunar and terrestrial lavas gives reasonable estimates of oxygen fugacities, but generally yields subsolidus temperatures, suggesting re-equilibration of one or more phases during cooling.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0016-7037(85)90061-4</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>The heat-capacity of ilmenite and phase equilibria in the system Fe-T-O</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>