A model of crystal defects in calcite by sodium and potassium uptake.

スポンサーリンク

概要

• 論文の詳細を見る

• Crystal defects in calcite containing Na and K ions were investigated by means of a model based on statistical thermodynamics and measurements of thermoelectric power. The varying amount of Na and K ions in the crystal was interpreted on an assumption of ideal solution of the ions as Ca<SUB>1−<I>x</I>−<I>y</I></SUB>\square<SUB><I>x</I>+<I>y</I></SUB>[Na<SUB>2<I>x</I></SUB>, K<SUB>2<I>y</I></SUB>]CO<SUB>3</SUB>, where \square and [ ] means Ca-vacancy and interstitial ion, respectively. In the model, the excess charge of Na and K ions is balanced with Ca-vacancy to form interstitial-vacancy pairs ([Na, K]<SUB>2</SUB>\square). Measurements of thermoelectric power in calcite showed the cationic transport which resulted from Na and K interstitials and/or Ca-vacancies. From the ideal mixing of Na and K ions at interstitial sites, the K/Na molar ratio in calcite was correlated with that in aqueous solution at 20 °C and pH 8.5 by the formula,<BR>\fracK<SUB>S</SUB>Na<SUB>S</SUB>=0.20\fracK<SUB>L</SUB>Na<SUB>L</SUB>,<BR>where S and L refer to solid- and aqueous-phase, respectively.

• 公益社団法人 日本化学会の論文

著者

• Ishikawa Masamichi

  Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology

• Ichikuni Masami

  Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology

関連論文

• Global Myocardial Ischemia as a Complication of an Acute Type A Aortic Dissection : Rapid Diagnosis of a Case by Transesophageal Echocardiography
• A model of crystal defects in calcite by sodium and potassium uptake.

スポンサーリンク