ATLAS OF ZEOLITE FRAMEWORK TYPES_ اطلس انواع زئولیت

ATLAS OF ZEOLITE FRAMEWORK TYPES

Zeolites and zeolite-like materials do not comprise an easily definable family of crystalline solids. A simple criterion for distinguishing zeolites and zeolite-like materials from denser tectosilicates is based on the framework density (FD), the number of tetrahedrally coordinated atoms (T-atoms) per 1000 Å3. Figure 1 shows the distribution of these values for porous and dense frameworks whose structures are well established(3). A gap is clearly recognizable between zeolite-type and dense tetrahedral framework structures. The lower boundary ranges from 19 to over 21 T-atoms per 1000 Å3, depending on the type of smallest rings present. Strictly speaking the boundaries defined in Figure 1 for the framework densities apply to fully crosslinked frameworks only. Therefore, Figure 1 does not include interrupted frameworks. For each framework type code (see below), two pages of data are included in the ATLAS. The left hand page lists the information that characterizes the framework type. This includes crystallographic data (highest possible space group, cell constants of the idealized framework), coordination sequences, vertex symbols and loop configurations. Taken together the last three pieces of information define the framework type. On the second page, data for the type material (i.e. a real material) can be found. Although the channel dimensionality is a property of the framework type, the channel description also
includes the observed ring dimensions, and must therefore refer to the type material. For all framework types, a list of isotypic materials and their references are also given. The different entries in the data sheets are described in more detail below in the order in which they appear on these pages.

برای دانلود این کتاب بر روی دانلود کلیک کنید

دانلود

دیدگاهتان را بنویسید لغو پاسخ

بازگشت به بالا

صنایع شیمیایی بتنو

دسترسی سریع

چرا ما

راه‌های ارتباطی

درباره بتنو:

بتنو به عنوان تولید کننده صنایع شیمیایی تاثیرگذار و پر مخاطب در عرصه صنعت بتن آماده و قطعات بتنی پیش ساخته و کلیه صنایع وابسته به بتن (تولید کنندگان سیمان پوزولان، سنگدانه، افزودنی های بتن، ادوات و تجهیزات تولید، حمل نقل و غیره) فرصت های بی نظیری را برای تان فراهم کرده است.

© کپی رایت 2025 | کلیه حقوق مادی و معنوی متعلق به بتنو می باشد