Formation of Mg[sub 3]BN[sub 3] under high pressures and temperatures in the system Mg[sub 3]N[sub 2]-hBN

Journal Article · Thu Apr 15 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90057-Y· OSTI ID:6518474

Lorenz, H ^[1]; Orgzall, I ^[2]; Hinze, E ^[3]; Kremmler, J ^[4]

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1. FB Physikalische Technik Frauenstuhlweg, Iserlohn (Germany)
2. Univ. Potsdam (Germany)
3. IGL Univ. Giessen (Germany)
4. GeoForschungszentrum Potsdam (Germany)

Magnesium boron nitride is a well known and often applied catalyst for the transformation from hexagonal boron nitride (hBN) to its cubic polymorph cBN. Recently published results of structural investigations contributed to a better understanding of the catalytic properties of this compound and its high pressure-high temperature phase diagram. Its normal pressure crystal structure was analyzed by x-ray powder methods and structural refinements by Hiraguchi et al. while several phase transitions to high pressure-high temperature polymorphs were observed in situ using a multi-anvil high pressure device. The Mg[sub 3]BN[sub 3] starting material for these experiments was prepared by chemical procedures. But as already was pointed out Mg[sub 3]BN[sub 3] also arises as an intermediate phase in the Mg[sub 3]N[sub 2]-BN system at high pressures and temperatures. therefore, in the following, the specific formation conditions in this system shall be investigated and, especially, relation to the phase behavior of magnesium nitride will be examined.

• OSTI ID: 6518474
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 28:8; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON NITRIDES
CRYSTAL-PHASE TRANSFORMATIONS
MAGNESIUM NITRIDES
PHASE STUDIES
CATALYSTS
EXPERIMENTAL DATA
PHASE DIAGRAMS
ALKALINE EARTH METAL COMPOUNDS
BORON COMPOUNDS
DATA
DIAGRAMS
INFORMATION
MAGNESIUM COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
PHASE TRANSFORMATIONS
PNICTIDES
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies