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Study of chemical interaction and phase relations in the binary B-X systems(X = N,P,Si)at pressures to 20 GPa and temperatures to 3000 K have been performed by synchrotron X-ray diffraction.electrical resistivity measurements and quenching with the aim(i)to construct equilibrium and metastable phase p-T diagrams of the systems using models of phenomenological thermodynamics with interaction parameters derived from the experimental data,and thus provide a route to the synthesis of new boron-rich B-X phases; and(ii)to comprehensively investigate the materials recovered from high pressure-high temperature experiments by a rich variety of characterization techniques in order to define their structure and properties,with particular attention paid to superhard and refractory phases whose advanced properties and thermal stability could be of technological importance.