The filamentation of focused 300 fs laser pulses with variable polarization azimuth in bulk synthetic HPHT diamond demonstrates the possibility polarization-dependent bandgap control for crystal dielectric photoexcitation. This directly affects value threshold power, which exhibits distinct dependence on angle. nonlinear photoluminescence yield, when focusing ultrashort diamond, indicates diffe...

Possibility and advantages of use of a single crystal diamond (HPHT and CVD) as highly effective secondary emitter are shown in this paper. The maximum secondary electron emission (SEE) coefficient about 14 at working accelerating voltage is received (several times exceeds SE coefficient of used materials, such as silicon), lack of dependence on diamond type is shown, dependence on current of p...

Layered superconductors are attractive because some of them show high critical temperatures. While their crystal structures are similar, these compounds are composed of many elements. Compounds with many elements tend to be incongruent melting compounds, thus, their single crystals cannot be grown via the melt-solidification process. Hence, these single crystals have to be grown below the decom...

The combination of long spin coherence time and nanoscale size has made nitrogen vacancy (NV) centers in nanodiamonds the subject of much interest for quantum information and sensing applications. However, currently available high-pressure high-temperature (HPHT) nanodiamonds have a high concentration of paramagnetic impurities that limit their spin coherence time to the order of microseconds, ...

Studying the dependence of degree (α) and rate (ϑ) phase transformation graphite into diamond on synthesis time at different temperatures developed synthetic diamonds using technology high-pressure high-temperature in a metal melt (HPHT), we determined critical mass diamonds, which indicates entry system stability region graphite, where graphitization occurs. The role implanted metals hydrogen ...

Traditionally, the H2S partial pressure (PH2S) of gas/hydrocarbon phase has been used as primary sour severity metric for material qualification and selection under ANSI/AMPP (NACE) MR0175/ISO 15156 guidelines. While PH2S is appropriate characterizing low total systems, strict, or ideal, Henry’s Law approach leads to over estimation dissolved concentration (CH2S) high-pressure, high-temperature...

We investigate the aerobic oxidation of high-pressure, high-temperature nanodiamonds (5-50 nm dimensions) using a combination of carbon and oxygen K-edge X-ray absorption, wavelength-dependent X-ray photoelectron, and vibrational spectroscopies. Oxidation at 575 °C for 2 h eliminates graphitic carbon contamination (>98%) and produces nanocrystals with hydroxyl functionalized surfaces as well as...

The nucleation of cubic boron nitride (cBN) single crystals synthesized with lithium nitride (Li3N) as a catalyst under high pressure and high temperature (HPHT) was analyzed. Many nanometer-sized cubic boron nitride nuclei formed in the near surface layer, as detected by high resolution transmission electron microscopy. Based on the experiment results, the transformation kinetics is described ...