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YILUK

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[求助] 求一个SiO2-Al2O3-P2O5体系的三角形玻璃形成区域相图已有1人参与

求助木虫上的各位大神：
现在老板让设计一个SiO2-Al2O3-P2O5体系的玻璃配方，于是开始找这个体系的玻璃生成相图，
怎么也找不到，结合其他相图只能推出两个点。。求大神帮忙找找，文献中的也行，高手推导出的也行，金币奉上！

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1楼2016-06-22 09:59:07

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YILUK

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2楼: Originally posted by wydmhy at 2016-06-24 17:01:50
Al2O3-SiO2-P2O5

Fig. 93-156—System P2O5-SiO2-Al2O3. Solid state phase relationships in air from 900¡ã-1100¡ãC. Mul = Al6Si2O13; Trd = tridymite (SiO2).
R. Umlauf, ...

再请问这个相图中的玻璃生成区间是哪里？

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4楼2016-06-27 11:30:59

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【答案】应助回帖

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感谢参与，应助指数 +1
YILUK(bible2代发): 金币+5, OK 2016-06-24 19:38:27

Al2O3-SiO2-P2O5

Fig. 93-156—System P2O5-SiO2-Al2O3. Solid state phase relationships in air from 900¡ã-1100¡ãC. Mul = Al6Si2O13; Trd = tridymite (SiO2).
R. Umlauf, H. Von Platen, A. A. Forughi, and P. Bartha, Ber. Dtsch. Keram. Ges., 57 [4-5] 83-85 (1980).

An unspecified number of compositions were prepared, using unspecified raw materials. Samples were annealed at 300¡ã, 600¡ã, 700¡ã, 900¡ã, and 1100¡ãC for periods up to 25 d. Loss of P2O5 was avoided through the use of double-crimped Au-Pt tubes to contain all mixtures. Phase identification was performed using Guinier X-ray diffraction, with CuKa radiation and Si as internal standard.
The ternary compound was found to be formed reproducibly at all temperatures above 700¡ãC, with some indication of phase formation below that temperature. The chemical formula Si2AlP3O13 was determined using an energy-dispersive microprobe system (average of 45 measurements on 4 specimens). The compound exists in two stable crystallographic modifications; a third modification is obtained irreproducibly on grinding the crystal. Both stable modifications exhibit hexagonal prismatic growth habit and have negative optical extinction. Indexed X-ray data for the stable modifications are given, determined from single-crystal precession X-ray diffraction (MoKa radiation) from selected fragments of both crystal types. The high-temperature phase is said to be trigonal, space group P321, P3m1, or P3¡￥m1, with a = 3.212 nm and c = 0.886 nm, but powder data can be indexed using a hexagonal pseudocell with a = 0.803 nm and c = 0.886 nm. The stable, low-temperature phase is hexagonal, space group P6322, with a = 0.801 nm and c = 0.920 nm.
Figure 364 shows a compound, Si2P2O9, but Ref. 1 confirms the composition as Si5P6O25.
The principal ternary phase assemblages indicated are as determined by Forughi.2 Tie-lines in two-phase regions have been added for clarity by the editors.

1. A. E. Mal'shikov, Zh. Neorg. Khim., 32 [10] 2370-2374 (1987); Russ. J. Inorg. Chem. (Engl. Transl.), 32 [10] 1383-1385 (1987).
2. A. A. Forughi; "Phase Relations in Al2O3-P2O5 and SiO2-Al2O3-P2O5 Systems"; Ph.D. Dissertation. Johannes-Gutenberg-University Mainz, Mainz, Germany, 1974.
A.E.M.

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