T. Kovalskaya, V. Ermolaeva, N. Chukanov, D. Varlamov, Georgy A. Kovalskiy, E. Zakharchenko, G. M. Kalinin, Korney D. Chaichuk
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引用次数: 1
摘要
摘要以Na2CO3、CaO、Fe2O3、ZrOCl2和SiO2为化学测量物,在1 M NaCl和NaF水溶液存在下,以Na15Ca6Fe3Zr3Si(Si25O73)(OH)Cl2·H2O对应的Na:Ca:Fe:Zr:Si比例,在T = 600℃和P = 2 kbar条件下,水热合成了与电解液相关的化合物。在铂安瓿中进行了10天的合成。天然拉斯莱克石(一种钙缺乏的成员)被用作种子,添加量相当于整个电荷的2%。通过粉末x射线衍射、红外和拉曼光谱、形貌特征和电子探针显微分析对产物进行了表征。在NaCl的实验中,得到了几乎纯的醇析型化合物。在NaF溶液存在下合成,形成以f为主导的易溶物型化合物,其主要产物为拉斯拉矿,副产物为钛矿、钒云母矿和钙云母矿。所有合成的初析物型化合物均富锆、缺铁,类似于与佛雅岩相关的高凝岩中的初析物群矿物。随着反应体系中NaCl含量的增加,合成的透析液相关化合物中Ca含量也随之增加。合成的初析液型化合物的晶体化学式是根据先前对初析液族矿物建立的一般规律推导出来的。
Synthesis of Fe-deficient eudialyte analogues: Relationships between the composition of the reaction system and crystal-chemical features of the products
Abstract Eudialyte-related compounds have been synthesised hydrothermally at T = 600°C and P = 2 kbar from a stoichiometric mixture of Na2CO3, CaO, Fe2O3, ZrOCl2 and SiO2 using the Na:Ca:Fe:Zr:Si ratios corresponding to the eudialyte end-member Na15Ca6Fe3Zr3Si(Si25O73)(OH)Cl2⋅H2O, in the presence of 1 M aqueous solutions of NaCl and NaF. The synthesis was carried out in platinum ampoules over 10 days. Natural raslakite (a Ca-deficient member of the eudialyte group) was used as a seed and added in amounts corresponding to 2 wt.% of the whole charge. The products were characterised by powder X-ray diffraction, IR and Raman spectroscopy, morphological features, and electron probe microanalyses. In experiments with NaCl, almost pure eudialyte-type compounds were obtained. Synthesis in the presence of a NaF solution resulted in the formation of a F-dominant eudialyte-type compound related to raslakite as the main product and aegirine, vlasovite and lalondeite as by-products. All synthesised eudialyte-type compounds are Zr-rich and Fe-deficient, similar to eudialyte-group minerals from hyperagpaitic rocks related to foyaites. The increased NaCl contents in the reaction system results in increased Ca content in the synthesised eudialyte-related compounds. The crystal-chemical formulae of the synthesised eudialyte-type compounds are derived based on general regularities established earlier for eudialyte-group minerals.
期刊介绍:
Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.