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首页> 外文期刊>Metallurgical and Materials Transactions B >Thermodynamic Measurement of Calcium Phosphates by Double Knudsen Cell Mass Spectrometry
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Thermodynamic Measurement of Calcium Phosphates by Double Knudsen Cell Mass Spectrometry

机译：双Knudsen细胞质谱法热力学测量磷酸钙

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摘要

The pressures of gaseous phosphorus oxide in equilibrium with a mixture of (CaO)4P2O5 and CaO or (CaO)3P2O5 and (CaO)4P2O5 under a phosphorus vapor pressure controlled by Cu-P alloy at 1523 to 1623 K were directly measured by double Knudsen cell mass spectrometry. The Gibbs energy changes of the following reactions calculated from the measured pressures were as follows: $$ begin{aligned} &4{text{CaO}}left( {text{s}} right) + {text{ P}}_{ 2} ( {text{g}}) + {frac{5}{2}}{text{O}}_{ 2} ( {text{g}} ) = ( {text{CaO}})_{ 4} {text{P}}_{ 2} {text{O}}_{ 5} ({text{s}}) & quad Updelta G^{^circ } = - 2,211,000 + 520T( { pm 15,000}),{text{J}} & 3{text{CaO}}({text{s}}) + {text{ P}}_{ 2} ({text{g}}) + {frac{5}{2}}{text{O}}_{ 2} ({text{g}}) = ({text{CaO}})_{3} {text{P}}_{ 2} {text{O}}_{ 5} ({text{s}}) & quad Updelta G^{^circ } = - 2,204,000 + 526T({ pm 16,000}),{text{J}} end{aligned}$$
机译：与（CaO）4 P2 O5 和CaO或（CaO）3 P2 O5 和（CaO）4 P2 O5 。根据测得的压力计算出的以下反应的吉布斯能量变化如下：$$开始{对齐}＆4 {text {CaO}}左（{text {s}}右）+ {text {P}} _ {2 }（{text {g}}）+ {frac {5} {2}} {text {O}} _ {2}（{text {g}}）=（{text {CaO}}）_ {4} {text {P}} _ {2} {text {O}} _ {5}（{text {s}}）＆quad Updelta G ^ {^ circ} =-2,211,000 + 520T（{pm 15,000}），{文本{J}}和3 {text {CaO}}（{text {s}}）+ {text {P}} _ {2}（{text {g}}）+ {frac {5} {2}} {text {O}} _ {2}（{text {g}}）=（{text {CaO}}）_ {3} {text {P}} _ {2} {text {O}} _ {5 }（{text {s}}）＆quad Updelta G ^ {^ circ} =-2,204,000 + 526T（{pm 16,000}），{text {J}}结尾{aligned} $$

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  • 来源
    《Metallurgical and Materials Transactions B》 |2009年第4期|544-549|共6页
  • 作者

    Takashi Nagai; Masao Miyake; Masafumi Maeda;

  • 作者单位

    Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan;

    Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan;

    Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan;

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