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000474900 1001_ $$0P:(DE-H253)PIP1008849$$aSchimpf, Christian$$b0$$eCorresponding author
000474900 245__ $$aEffect of the microstructure of graphitic boron nitride on the kinetics of the formation of boron nitride high-pressure phases
000474900 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2019
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000474900 520__ $$aThree types of hexagonal boron nitride (h-BN) with graphitic crystal structure having different microstructures were subjected to high pressures (HP) and high temperatures (HT), and the kinetics of the phase transitions to the sp$^3$-hybridized phases (w-BN, c-BN) was studied using in situ synchrotron diffraction. The analysis of the phase transformation kinetics revealed the transformation paths and activation energies E$_a$ of the transformation of h-BN to the high-pressure forms of BN for different microstructures of h-BN. Defect-poor h-BN transforms to metastable wurtzitic BN (w-BN) with E$_a$ ≈ 0.3 eV/at. Defect-rich forms of h-BN transform directly to c-BN, but with a higher activation energy. It was observed that the turbostratic disorder in h-BN retards the phase transition as compared to h-BN containing corrugated basal planes and a low degree of turbostracity. The experimental results are discussed in view of the microstructure changes during the HP/HT treatment and compared to available theoretical phase transition models.
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000474900 7001_ $$0P:(DE-H253)PIP1008544$$aSchwarz, Marcus$$b1
000474900 7001_ $$0P:(DE-H253)PIP1002121$$aLathe, C.$$b2
000474900 7001_ $$0P:(DE-HGF)0$$aKroke, E.$$b3
000474900 7001_ $$0P:(DE-H253)PIP1026941$$aRafaja, D.$$b4
000474900 773__ $$0PERI:(DE-600)2013983-4$$a10.1016/j.jeurceramsoc.2018.10.021$$gVol. 39, no. 4, p. 944 - 951$$n4$$p944 - 951$$tJournal of the European Ceramic Society$$v39$$x0955-2219$$y2019
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