| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method capable of producing a diamond having a crystal structure similar to that of a natural diamond without using an expensive and special production device. <P>SOLUTION: The method of producing the diamond comprises: a step A for producing a cinder-like carbonized material by heating tar generated when burning timbers such as pine or cedar after pouring them into a kettle; a step B for crushing the cinder-like carbonized material obtained by the step A, charging the crushed material into methylene iodide to remove a supernatant liquid, taking out a precipitate sedimented in methylene iodide, washing by water, and selecting only black polyhedral crystals from the precipitate; and a step C for heating the polyhedral crystals obtained by the step B at a temperature of 400 to 600°C under normal pressures without pressurizing until obtaining a water-white crystal. When producing the diamond having a size of approximately one carat, the heating time of the step C is about two years. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
