Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
1. Об одном преобразовании элиптических интегралов
2. О реципрочных кривых и поверхностях
3. Сферические схемы
4. Баритокальцит и псевдоморфоза по нему барита
5. Естественные фигуры вытравления на топазе
6. Кристаллы минералогического музея
7. О сплавах платины с оловом
8. Кристаллы K2Cr2O7, их структура и двойники
Краткие сообщения
1. Сомнительный двойник авгита из Монте Росси
2. Усовершенствование критерия правильной установки кристаллов
3. Друзоид с р.Слюдянки
4. Случай вторичного наростания первичных полевыхъ шпатов порфира. Одна новая комбинация двойниковых законов четверника. Двойники по первой оси и перпендикуляру к ней
Crystals are solid materials having regular atomic arrangements characterized by periodicity and anisotropy. These properties are universally present, irrespective of whether the crystal is inorganic or organic, in living systems or in the inanimate world. Crystals exhibit various external forms, as represented by the elaborately varied dendritic forms of snow crystals or the hexagonal prismatic forms of rock-crystal. This variety of shape has stimulated scientific curiosity since the seventeenth century, since when intensive efforts have been made to understand the reasons why and how crystals can take a variety of forms <...>
This is volume five in the series of picture books that I am creating for educational purposes. All images in this volume were created using the program JPOWD from MDI (www.materialsdata.com). The structures presented here correspond to the crystal structure gallery on my website (www.jcrystal.com/steffenweber/gallery/StructureTypes/st1.html). On that website you can also find further data, such as unit cell parameters and atom coordinates .
Let us begin with the question: What is a pattern? The answer to this question is as much objective as it may be subjective. From the days unknown, the human race have started studying and appreciating the regular periodic features like movement of stars, moon, sun, the beautiful arrangement of petals in flowers, the shining faces of gems, and also the beautiful wings of a butterfly.
This fully revised and updated edition has been prepared by a very active worker in the field, who has used previous editions extensively both in teaching and in research, together with one of the original authors. Since the first edition, written in the late 1960s, understanding of crystal defects such as dislocations, stacking faults, twin, grain and interphase boundaries and of their effect on the mechanical and electrical properties of materials has grown enormously and has been accompanied by a total change in style of the way in which both research and teaching are carried out through the use of the fast digital computer. This edition takes account of this change. <...>