Cubic-to-rhombohedral transformation in boron nitride induced by laser heating:<i>In situ</i>Raman-spectroscopy studies

Liu, Jun; Vohra, Yogesh K.; Tarvin, John T.; Vagarali, Suresh S.

doi:10.1103/physrevb.51.8591

Cited by 42 publications

(20 citation statements)

References 12 publications

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“…5,8,[13][14][15][16][17] The c-BN and h-BN data of the present work are consistent with all experimental and theoretical data for these two phases. Our data on w-BN compare well with those from a very recent theoretical study.…”

Section: A Equilibrium Properties and Phonon Dispersion Of C-bn H-bsupporting

confidence: 92%

“…Our data on w-BN compare well with those from a very recent theoretical study. 6 As for r-BN, our data are the first set of theoretical results in this subject and agree well with the experimental data of Liu et al 8 The consistency of our data on equilibrium properties and phonon-dispersion properties in reference to those in the literature supports our calculation methodologies, and the subsequent analysis of the phase properties and phase transformation of the four polytypes of BN.…”

Section: A Equilibrium Properties and Phonon Dispersion Of C-bn H-bsupporting

confidence: 91%

“…In addition to citing the above experimental data on c-BN/ h-BN transformation, we like to remark that Liu et al 8 2. Phonon density of states and dispersion spectra of c-BN, w-BN, h-BN, and r-BN. YU, LAU, CHAN, LIU, AND ZHENG PHYSICAL REVIEW B 67, 014108 ͑2003͒…”

Section: B Phase Diagrams Of C-bn H-bn R-bn and W-bnmentioning

confidence: 92%

“…[3][4][5][6] However, in practical boron nitride synthesis, which takes place near atmospheric pressure in a wide temperature range, sp 2 BN is commonly formed. In addition, it has also been shown experimentally that c-BN can be transformed into h-BN by moderate heating 7 and r-BN by laser heating, 8 both at atmospheric pressure. A coherent model for explaining the phase transformations among the polytypes of BN is required.…”

Section: Introductionmentioning

confidence: 97%

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Ab initiostudy of phase transformations in boron nitride

et al. 2003

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The structural properties and phase stability of the four common polytypes of boron nitride, cubic zinc blende (c-BN͒, hexagonal (h-BN͒, wurtzite (w-BN͒ and rhombohedral (r-BN͒, are studied by ab initio calculations. Electronic energies are calculated using an ultra soft pseudopotential method under the densityfunctional theory, and phonon dispersions are calculated using the first-principles force-constant method. The p-T phase diagrams of these four boron nitride phases are constructed with the quasiharmonic approximation. Direct compression simulations are then performed to find probable phase transformation paths among these polytypes, with additional energy calculations of plausible transition structures. The c-BN phase is the most thermodynamically stable in ambient conditions among these four polytypes, and the transformation between r-BN and c-BN has the smallest energy barrier. Direct transformation between h-BN and c-BN is far less favorable than indirect transformation, with w-BN or r-BN as an intermediate. The presence of structural defects is a key attribute in reducing the energy barrier of phase transformation. The results in this work offer theoretical clues to experimental data on c-BN film growth, particularly the absence of w-BN.

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Section: A Equilibrium Properties and Phonon Dispersion Of C-bn H-bsupporting

confidence: 92%

Section: A Equilibrium Properties and Phonon Dispersion Of C-bn H-bsupporting

confidence: 91%

Section: B Phase Diagrams Of C-bn H-bn R-bn and W-bnmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 97%

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Ab initiostudy of phase transformations in boron nitride

et al. 2003

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“…rBN has two vibration modes, both of which are Raman and infrared active. These modes are closely related to the IR-active modes of hBN' and have been found by Raman analysis at essentially the same frequencies as the IR-active modes of hBN [44,45]. Therefore, the IR spectra of hBN and ' The A, and E modes of rBN involves vibration of the B and N atoms between and within.…”

Section: P/me Stdilir)mentioning

confidence: 89%

Review of advances in cubic boron nitride film synthesis

Mirkarimi¹,

McCarty²,

Medlin³

1997

Materials Science and Engineering: R: Reports

598

349

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Cubic boron nitride (cBN) has a number of highly desirable mechanical, thermal, electrical, and optical properties. Because of this, there has been an extensive worldwide effort to synthesize thin films of cBN. Film synthesis is difficult in that without significant levels of ion bombardment during growth, only sp2-bonded BN forms, not sp3-bonded cBN. Recently there has been considerable progress in improving the deposition techniques and cBN film quality. In addition, progress has been made in understanding how energetic deposition conditions can lead to cBN formation. However, unanswered questions remain and process improvements are still needed. In this paper we critically and comprehensively review recent developments in cBN film synthesis and characterization. First, the structures and stability of the BN phases and characterization techniques are described. Next, the key experimental parameters controlling cBN film formation and synthesis techniques are discussed. Following a review of microstructure, the proposed mechanisms of cBN formation and the observed mechanical and electrical properties of cBN films are analyzed. We conclude by highlighting the current impediments to the practical realization of cBN-film technology. 0 1997 Published by Elsevier Science S.A.

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Boron nitride (BN), melting point, Debye temperature density, entropy,etc., cubic modification

Landolt-Börnstein - Group III Condensed Matter

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Cubic-to-rhombohedral transformation in boron nitride induced by laser heating:In situRaman-spectroscopy studies

Cited by 42 publications

References 12 publications

Ab initiostudy of phase transformations in boron nitride

Ab initiostudy of phase transformations in boron nitride

Review of advances in cubic boron nitride film synthesis

Boron nitride (BN), melting point, Debye temperature density, entropy,etc., cubic modification

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