High-Temperature Chemistry of Silicates and Other Oxide by Nikita Aleksandrovich Toropov, Valentin Pavlovich

By Nikita Aleksandrovich Toropov, Valentin Pavlovich Barzakovskii (auth.)

The ever-increasing value of chemical reactions at excessive and superhigh temperatures in crystalline, amorphous, and semicrystalline SOlids, in addition to the reactions of those solids with gases, brought on the authors of this publication to envision seriously the literature on hand during this box and to provide a common assessment of the topic. during this monograph we talk about these chemical and physicochemical issues which we deliberate to be most vital for fixing a sequence of difficulties within the coaching and use of latest inorganic fabrics. we are hoping that this publication may be of curiosity to the various experts engaged on inorganic fabrics. N. A. Toropov PREFACE Modem expertise calls for ever extra fabrics with excessive mechanical energy, warmth and chemical re­ sistance, hearth resistance, detailed electric houses, specific habit towards lively radiations, and so on. the quest for such fabrics calls for the learn of assorted chemical substances, steel alloys, and different fused in­ natural structures, particularly oxide platforms. fabrics in line with oxides start to think expanding value in lots of fields of the hot know-how. during this connection the research of oxides and platforms inclusive of and extra oxides is increasing greatly.

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By Nikita Aleksandrovich Toropov, Valentin Pavlovich Barzakovskii (auth.)

The ever-increasing value of chemical reactions at excessive and superhigh temperatures in crystalline, amorphous, and semicrystalline SOlids, in addition to the reactions of those solids with gases, brought on the authors of this publication to envision seriously the literature on hand during this box and to provide a common assessment of the topic. during this monograph we talk about these chemical and physicochemical issues which we deliberate to be most vital for fixing a sequence of difficulties within the coaching and use of latest inorganic fabrics. we are hoping that this publication may be of curiosity to the various experts engaged on inorganic fabrics. N. A. Toropov PREFACE Modem expertise calls for ever extra fabrics with excessive mechanical energy, warmth and chemical re­ sistance, hearth resistance, detailed electric houses, specific habit towards lively radiations, and so on. the quest for such fabrics calls for the learn of assorted chemical substances, steel alloys, and different fused in­ natural structures, particularly oxide platforms. fabrics in line with oxides start to think expanding value in lots of fields of the hot know-how. during this connection the research of oxides and platforms inclusive of and extra oxides is increasing greatly.

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Such a change to hexagonal cordierite is sudden rather than gradual. ,,' 1'1'+e+ I 3D I I I I I. / • I' / + II' ," " ~ 1''' +. 1 0. 2 ii, deg 28 Fig. 34. Relation between the distortion index and the optical angles of cordierite and indialite. 1) Unheated sample; 2) heated sample. a~1 AI' ! 20. 30. 20. 10. 0. 1'150. T,"C Fig. 35. Relation of the distortion index D. of cordierites of various compositions to temperature. A) Beginning of fusion; B) disappearance of cordierite. The numbers of the samples correspond to the notation in Fig.

I': 1 114 100 /1/ /I! o II: 10 20 30 Pressure, kilobars so Fig. 22. Region of stability of coesite. 1) Quartz -+ coesite; 2) coesite -+ quartz; 3) quartz without change; 4) coesite without change. 6~--_J 10 30 28,deg 50 Fig. 23. Ionization curves of quartz-like phases. X-Ray Diffraction Study of Metastable Quartz-Like phases. 345. Figure 23 gives ionization diffraction patterns (curves 3-5) of powdered samples lying along the line Si02 - MgO . A120 S (CuK a radiation). For comparison we give here diffraction patterns of 13 -eucryptite (curve 6), high-temperature quartz (curve 2), and low-temperature quartz (curve 1).

1250 -rTridymite I 112 I 1 1 High-temperature I 750 680·C 1 J J 1 1 I 1000 100 1 I 1500 1---'" I . / Coesite !! I': 1 114 100 /1/ /I! o II: 10 20 30 Pressure, kilobars so Fig. 22. Region of stability of coesite. 1) Quartz -+ coesite; 2) coesite -+ quartz; 3) quartz without change; 4) coesite without change. 6~--_J 10 30 28,deg 50 Fig. 23. Ionization curves of quartz-like phases. X-Ray Diffraction Study of Metastable Quartz-Like phases. 345. Figure 23 gives ionization diffraction patterns (curves 3-5) of powdered samples lying along the line Si02 - MgO .

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