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    中南大學學報(自然科學版)

    Journal of Central South University

    第10卷    第2期    總第20期    1979年6月

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    關于K3ZrF7-NaCl偽二元系的研究
    趙秦生1

    (1.有色冶金系)

    摘 要: 國外對K3ZrF7-NaCl鹽系的研究,得到的結論各不相同,互相矛盾。為弄清K3ZrF7-NaCl系的實際情況,作者對此體系進行了差熱分析和X光相分析。X光相分析表明,在K3ZrF7-NaCl系熔體的室溫X光象片中,除K3ZrF7和NaCl的譜線外,還可能有Na3ZrF7、K3Na3Zr2F14和KCl的譜線。根據[K3ZrF7-NaCl]的比例不同,可發生下列兩個交互反應: K3ZrF7+3NaCl——Na3ZrF7+3KCl (1) 2K3ZrF7+3NaCl——K3Na3Zr2F14+3KCl (2) 作者將K3ZrF7和NaCl按一定比例熔合,成功地分離出純的交互產物K3ZrF7和K3Na3Zr2F14,并用X光相分析加以證實。結合差熱分析的數據,說明K3ZrF7-NaCl系獨立的二元系,而是(K+、Na+/ZrF73-、Cl-)三元交互系的一個不穩定的對角剖面。其液相線由二支組成,相應于K3ZrF7-Na3ZrF7固溶體和KCl-NaCl固溶體的析出。液相線最低點的組成為24%(克分子)K3ZrF7+76%NaCl,熔點為560℃。視K3ZrF7和NaCl的相對含量而定,得到的固態交互產物為K3Na3Zr2F14+KCl,K3Na3Zr2F14+Na3ZrF7+KCl或Na3ZrF7+KCl。

     

    關鍵字: 差熱分析; 熔體; 相圖; 文獻; 二元系; 固態; 固溶體; 相分析; 液相線; 交互反應

    Study of the Quasibinary Potassium Zircnate (K3ZrF7)-Sodium Chloride(NaCl) System
    趙秦生1

    1.有色冶金系

    Abstract:There are different conclusions concerning the study of the potassium zirco nate (K3ZrF7) sodium chloride (NaCl) system. In order to clarify the aciual condition this system was investigated by (he author,using both thermal and X-ray methds. The X-ray phase analysis shows that in the spektra of K3ZrF7-NaCl melts at room temperature besides the spectral lines of K3ZrF7 and NaCl there is a possibilily of the existence of the spectral lines of Na3ZrF3, K3Na3Zr2F14 and KCl. According to the proportion of K3ZrF7 and NaCl the following two reciprocal reactions are possible: K3ZrF7+3NaCl→Na3ZrF7+3KCl (1) 2K3ZrF7+3NaCl→K3Na3Zr2F14+3KCl (2) From the K3ZrF7+NaCl melts prepared with the nearly stoichiometricpro por tion the pure N3ZrF7 and K3Na3Zr2F14 were successfully separated as produ cts of the reciprocal reaction and were identified by X-ray phase analysis. The DTA and X-ray data indicate that the K3ZrF7 NaCl system is not an independent binary system but an unstable diagonal section of K+, Na+//ZrF73-, Cl- ternary reciprocal system. The liquidus consists of two branches correspon ding to precipitation of K3ZrF7-Na3ZrF7 solid solution and KCl NaCl solid solution. The composition of lowest point of the liquids is 24% (mol.) K3ZrF7 + 76% NaCl with melting point 560℃. The obtained solid products of the reciprocal reaction are K3Na3Zr2F14+KCl,K3Na3Zr2F14+Na3ZrF7 + KCl or Na3ZrF7 +KCl according to the relative content of K3ZrF7 and NaCl.

     

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    中南大學學報(自然科學版)
      ISSN 1672-7207
    CN 43-1426/N
    ZDXZAC
    中南大學學報(英文版)
      ISSN 2095-2899
    CN 43-1516/TB
    JCSTFT
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