Abstract Quartz crystals are found in nature. It is believed that these eco‐friendly and known for healing, decoration, gem therapy. However, there no scientific evidence of such effects, except it a piezoelectric material. The piezocatalytic effect viewed as having significant potential tackling environmental challenges water cleaning. performance was examined reported few dyes degradation. pu...

Supereruptions violently transfer huge amounts (100 s-1000 s km(3)) of magma to the surface in a matter of days and testify to the existence of giant pools of magma at depth. The longevity of these giant magma bodies is of significant scientific and societal interest. Radiometric data on whole rocks, glasses, feldspar and zircon crystals have been used to suggest that the Bishop Tuff giant magm...

The surface crystallization of CaCO3 on gold was monitored by a quartz crystal microbalance (QCM). Quantitative control of the grown crystals was realized by adjusting the ratio of two functional groups, -N(CH3)3 and -COOH, on SAMs. Crystals with uniform size, morphology and polymorphism were obtained. The amount of crystals formed was found to increase with an increase in the -COOH group. The ...

We measured the second-harmonic signal generated by high-quality zinc oxide single crystals. Comparing this signal with that generated by single-crystal quartz, used as a standard, we found that the components of the second-order susceptibility tensor differ somewhat from the values reported earlier. Measurements of two zinc oxide single crystals with different orientations yield similar results.

Review of technical and economic problems enCOUntered in industry. Improvements that need to be brought, both at process and equipment levels with the help of scientific laboratories. Applications concerning piezoelectric materials. This paper is divided in four parts : 1 PROCESS' HISTORICAL DEVELOPMENT AND PRESENT STATUS' OUTLINES 2 MAIN DIFFICULTIES ENCOUNTERED IN HYDROTHERMAL SYNTHESIS 3 PRE...

Supereruptions catastrophically eject 100s-1000s of km3 of magma to the surface in a matter of days to a few months. In this study, we use zoning in quartz crystals from the Bishop Tuff (California) to assess the timescales over which a giant magma body transitions from relatively quiescent, pre-eruptive crystallization to rapid decompression and eruption. Quartz crystals in the Bishop Tuff hav...