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Nesper group > research > topics > hard, highly melting materials
 
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  Precursor derived ceramics
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The compounds being investigated are based on the light elements Li, B, C, N and O.

LiBC, MgB2C2, LiB0.89, Li6B18(Li2O)x and Li2B2 are prominent crystalline representatives, some of which are related to the new superconductor MgB2.

SiBNC-Ceramics are amorphous high temperature materials synthesized via a new polymer precursor route. Decomposition temperature of these type of materials are beyond 2000K (see: precursor derived ceramics).

Besides determining properties of such and related materials we apply high pressure to transform them into novel framework structures(1).

Theoretical calculations indicate strongly that clathrate frameworks of B/C/N may exist [1].


 

mgb2c2

Crystal structure of MgB2C2, high pressure form; Mg-blue; B-green; C-black

 

 

 
high

Sample holder, multi-anvil modul, Walker-type. Apparatus see: High-Pressure Lab @ ETH

 

Funding:

"Synthesis, Structure, and Properties of Solids"
Swiss National Science Foundation Nr. 20-66717.01

"Novel Framework Modifications of Carbon and Doped Carbons Through High Pressure Syntheses"
ETH - Research Council

"Nanocage Materials"
IHP - European - Network

Partners:

(1) High Pressure Lab @ ETH, Prof. Peter Ulmer

Literature:

[1]
R. Nesper, K. Vogel, P. E. Blöchl,
Hypothetical carbon modification derived from zeolithe frameworks.
Angew. Chem. 1993, 105, 786-788; Angew. Chem. Int. Ed. 1993, 32, 701-703

K.Vogel, R. Nesper
Novel hypothetical carbon modifications as host frameworks for dopants
J.Molec.Catal., 1993, 82, 467-468

M. Wörle, R. Nesper,
MgB2C2 - A new graphite-related refractory compound.
J. Alloys Comp. 1994, 216, 75-83

M. Wörle, H.-J. Muhr, H. Meyer zu Altenschildesche, R. Nesper,
Ca15(CBN)5(C2)2O - A new cubic structure type containing CBN4--anions together with acetylide and oxo anions.
J. Alloys Comp. 1997, 260, 80-87

G. Mair, H. G. von Schnering, M. Wörle, R. Nesper,
Dilithium hexaboride, Li2B6.
Z. Anorg. Allg. Chem. 1999, 625, 1207-1211

M. Wörle, R. Nesper,
Infinite, Linear, Unbranched Borynide Chains in LiBx- Isoelectronic to Polyyne and Polycumulene.
Angew. Chem. Int. Ed. 2000, 39, 2349-2353,
Angew. Chem. 2000, 112, 2439-2443

R. Nesper, S. Leoni
On Tilings and Patterns on Hyperbolic Surfaces and Their Relation to Structural Chemistry
Chemphyschem 2001, 2, 413 – 422

 

 

 

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