%0 Journal Article %1 Sachdev1997 %A Sachdev, H. %A Haubner, R. %A N?th, H. %A Lux, B. %D 1997 %J Diamond and Related Materials %K DTA Phase c-BN; h-BN; transition; %N 2--4 %P 286--292 %R doi:10.1016/S0925-9635(96)00697-8 %T Investigation of the c-BN/h-BN phase transformation at normal pressure %V 6 %X The phase transition of c-BN into h-BN was studied up to 1540?C showing that c-BN is the stable modification at standard conditions. The transformation was examined by DTA (differential thermoanalysis) measurements. The morphology changes during conversion of c-BN into h-BN were investigated by SEM (scanning electron microscopy) indicating that the formation of h-BN preferably starts at the surface of the c-BN single crystals. The transformation step was furthermore characterized by IR and Raman spectroscopy as well as X-ray diffraction. The results have shown that a solid state and a gas phase mechanism have to be considered responsible for the phase conversion. The onset temperature of the phase transition from c-BN to h-BN depends significantly on grain size and impurities present in the samples. The lowest temperature for the beginning of the phase transformation was observed with a micron-size c-BN at 900?C.

@article{Sachdev1997, abstract = {The phase transition of c-BN into h-BN was studied up to 1540?C showing that c-BN is the stable modification at standard conditions. The transformation was examined by DTA (differential thermoanalysis) measurements. The morphology changes during conversion of c-BN into h-BN were investigated by SEM (scanning electron microscopy) indicating that the formation of h-BN preferably starts at the surface of the c-BN single crystals. The transformation step was furthermore characterized by IR and Raman spectroscopy as well as X-ray diffraction. The results have shown that a solid state and a gas phase mechanism have to be considered responsible for the phase conversion. The onset temperature of the phase transition from c-BN to h-BN depends significantly on grain size and impurities present in the samples. The lowest temperature for the beginning of the phase transformation was observed with a micron-size c-BN at 900?C.}, added-at = {2009-11-05T12:01:24.000+0100}, author = {Sachdev, H. and Haubner, R. and N?th, H. and Lux, B.}, biburl = {https://www.bibsonomy.org/bibtex/2a2832dad03430c3bbbc22ba14b28b35c/ghuot}, doi = {doi:10.1016/S0925-9635(96)00697-8}, institution = {Institute for Chemical Technology of Inorganic Materials, University of Technology Vienna, Getreidemarkt 9/161, A-1060, Vienna, Austria b Institut f?r Anorganische Chemie, Universit?t M?nchen, Meiserstr. I, D-80333, M?nchen, Germany }, interhash = {69f00cc3eef61fb5998fb4b891c54c59}, intrahash = {a2832dad03430c3bbbc22ba14b28b35c}, journal = {Diamond and Related Materials}, keywords = {DTA Phase c-BN; h-BN; transition;}, number = {2--4}, owner = {Guillaume}, pages = {286--292}, timestamp = {2009-11-05T12:01:34.000+0100}, title = {Investigation of the c-BN/h-BN phase transformation at normal pressure}, volume = 6, year = 1997 }