Sodium carbonate revisited

Sodium carbonate revisited
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DOI:
10.1107/s0108768103009017
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发表时间:
2003-06-01
期刊:
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE
影响因子:
--
通讯作者:
Petricek, V
Petricek, V
中科院分区:
其他
文献类型:
--
作者:
Dusek, M;Chapuis, G;Petricek, V

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我们目前的结构无水碳酸钠在室温下(相γ)和110 K(相δ)的基础上单晶X射线衍射数据。大约30年前,在谐波近似中使用一个调制波和一阶卫星确定了无公度相位伽马。在我们的工作中,我们使用卫星五阶和额外的谐波模型的结构的非谐特性。相称的相位三角洲是第一次。使用超空间的方法,这两个阶段进行比较,以找到共同的趋势,在整个范围内的碳酸钠相。我们提出的论点支持的假设,相变的驱动力可能起源于不饱和键的Na离子之一的潜力。
We present the structure of anhydrous sodium carbonate at room temperature ( phase gamma) and 110 K ( phase delta) based on single-crystal X-ray diffraction data. The incommensurate phase gamma was determined almost 30 years ago in the harmonic approximation using one modulation wave and first-order satellites. In our work we use satellites up to fifth order and additional harmonic waves to model the anharmonic features of the structure. The commensurate phase delta is presented for the first time. Using the superspace approach, both phases are compared in order to find common trends in the whole range of the sodium carbonate phases. We present arguments supporting the hypothesis that the driving force of the phase transitions may originate in the unsaturated bonding potential of one of the Na ions.