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首页> 外文期刊>Physics and chemistry of minerals >Heat transport properties of feldspathoids and ANA zeolites as a function of temperature
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Heat transport properties of feldspathoids and ANA zeolites as a function of temperature

机译：长石和ANA沸石的传热特性随温度的变化

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The phonon component of thermal diffusivity (D) was measured up to temperatures (T) of similar to 1350 K using laser-flash analysis from leucite, analcime, pollucite, nepheline, sodalite, and petalite, many of which were single crystals. From electron microprobe analysis, nepheline is a solid solution, Na-2(Na1.2K0.71)Al3.88Si4.10O16, whereas the other minerals have nearly endmember chemical compositions. From near-IR spectra, hydroxyl contents range from similar to 200 ppm to 1 wt%. At 298 K, D is low (0.51-0.75 mm(2) s(-1)) for the zeolites and the solid-solution nepheline but moderate (1.9-2.2 mm(2) s(-1)) for the endmember feldspathoids. For leucite, D decreases with increasing T until reaching the tetragonal to cubic phase transition whereupon D increases. A complex polynomial is required to describe D(T) for leucite, due to the displacive transition. For the other samples, as observed for most minerals, D decreases up to dehydration which terminated the runs and is described by FT (-G) + HT where G varies from 0.14 to 1.44 and H is negligible to 0.0006 K-1. Available heat capacity and volumetric data were used to calculate thermal conductivity as a function of T. For sodalite and petalite, k decreases with T, whereas for the remaining phases, k is roughly constant and low, similar to 1.5 Wm(-1) K-1.
机译：使用白云母，方石，方石，霞石，方钠石和方钠石的激光闪光分析，测量了高达1350 K的温度（T）时，热扩散率（D）的声子成分，其中许多是单晶。从电子探针分析来看，霞石是固溶体Na-2（Na1.2K0.71）Al3.88Si4.10O16，而其他矿物的化学成分几乎接近尾端。根据近红外光谱，羟基含量范围从约200 ppm到1 wt％。在298 K时，对于沸石和固溶霞石，D较低（0.51-0.75 mm（2）s（-1）），但对于末端长石长石则中等（1.9-2.2 mm（2）s（-1））。 。对于白云石，D随着T的增加而减少，直到达到四方相到立方相的转变，D随之增加。由于位移转变，需要一个复杂的多项式来描述白云石的D（T）。对于其他样品，正如大多数矿物所观察到的那样，D降低直至脱水终止运行，并用FT（-G）+ HT进行描述，其中G从0.14到1.44不等，H可以忽略不计为0.0006 K-1。可用的热容量和体积数据用于计算作为T的函数的热导率。对于方钠石和花瓣石，k随T减小，而对于其余相，k大致恒定且较低，类似于1.5 Wm（-1）K -1。

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