Packing of B12 groups in boron and boride structures
Abstract
This study is concerned with the establishment of structural properties common to all borides and modifications of boron which contain B12 polyhedral units. It has been found that all unit-cell dimensions in these structures can be derived from simple arrangements of B12 units which can be regarded as large metallic atoms that form interstitial compounds. The B12 units can also group together to form larger units such as the recently reported B84. These are also treated as individual entities. On this basis all the structures have been classified into three simple packing models: 1. cubic closest packing, 2. hexagonal closest packing, and 3. tetragonal close packing.
Occurrence of tetragonal close packing with 10 closest neighbors is unusual and is discussed in detail. The proposed simple models and their subclassifications lead to a successful interpretation of observed data and should provide a basis for prediction of possible structures of the B12 borides.
Articles in the same Issue
- Die Kristallstruktur von bis-Cyclooctadien-(1,5)-Nickel(0)
- Corrections for x-ray absorption by a crystal of arbitrary shape1
- Kristall- und Molekülstruktur von bis-Methallylnickel Ni[(CH2)2C · CH3]2
- A preliminary orienting procedure for single crystals, using the Weissenberg camera
- Mg2+ – Fe2+ order in an orthopyroxene, Mg0.93Fe1.07Si2O6
- On the x-ray determination of the iron-magnesium ratio in biotites
- Phases and twinning in C2Al3B48 (beta AlB12)
- Packing of B12 groups in boron and boride structures
- A crystallographic study of ammonium and rubidium imidodisulphates
- Interstitial derivatives of β boron
- Die Intensität der an gebogenen Glimmerspaltflächen in höheren Ordnungen reflektierten Röntgenstrahlung
- Morphology and space group of hexaantipyrine perchlorate complexes of Mg++, Ca++ and Zn++, and pentaantipyrine perchlorate of Cu++
- Kristallographische Daten von Quecksilber(I)-acetat
- Preliminary x-ray crystallographic data for 3,7-dideoxy-7-iodo-heptulosonate methyl ester
Articles in the same Issue
- Die Kristallstruktur von bis-Cyclooctadien-(1,5)-Nickel(0)
- Corrections for x-ray absorption by a crystal of arbitrary shape1
- Kristall- und Molekülstruktur von bis-Methallylnickel Ni[(CH2)2C · CH3]2
- A preliminary orienting procedure for single crystals, using the Weissenberg camera
- Mg2+ – Fe2+ order in an orthopyroxene, Mg0.93Fe1.07Si2O6
- On the x-ray determination of the iron-magnesium ratio in biotites
- Phases and twinning in C2Al3B48 (beta AlB12)
- Packing of B12 groups in boron and boride structures
- A crystallographic study of ammonium and rubidium imidodisulphates
- Interstitial derivatives of β boron
- Die Intensität der an gebogenen Glimmerspaltflächen in höheren Ordnungen reflektierten Röntgenstrahlung
- Morphology and space group of hexaantipyrine perchlorate complexes of Mg++, Ca++ and Zn++, and pentaantipyrine perchlorate of Cu++
- Kristallographische Daten von Quecksilber(I)-acetat
- Preliminary x-ray crystallographic data for 3,7-dideoxy-7-iodo-heptulosonate methyl ester
