Crystal structure alpha-quartz, lithium disilicate, and lithium monosilicate; optical filters; electronic circuits; magnetic discsdoi:US7589038 B2The present invention provides an inorganic composition for use in information recording medium disc substrate and such, having an excellent surface property ...
Crystal chemistry of alpha-quartz is discussed in relation to the nature, concentration and distribution of the common impurities. Two schemes for incorporation of impurities in the host structure, viz. , the charge compensation model for untwinned natural quartz, and the broken-bond model for ...
The history of the use of alpha quartz, SiO/sub 2/, one of the nine forms of silica is sketched, and its structure and crystallography are described. Piezoelectricity, the most important property of quartz from an electrical standpoint, is explained. Processing of quartz crystals to ensure prop...
The helical crystal structure in alpha-quartz acts as the natural micro-solenoids for an electromagnetic wave passing through them, producing a longitudinal magnetic field in the direction of the optical axis. The longitudinal magnetic field further induces the Larmor frequency for the rotation of the...
This chapter presents the numerical data and the simulated powder patterns of Alpha Quartz material with 39.49° as 2θ value. Two compositions, which are expressed in terms of the full unit cell content, are provided. The chemical composition is the nominal material composition provided in the ...
This stone has many useful crystal properties, and it has a strong energy to aid emotional healing. It is said to bring positive things into your life and it may help you to let go of undesirable behavioral patterns. Black Quartz Black Quartz ...
In this process, the samples were loaded into the furnace through one end of a quartz tube, positioned at the midpoint of the tube, and sealed on both ends with refractory bricks. Upon completion of the heat treatment experiments, the samples were withdrawn from the middle of the tube and...
Silica refractories are made by firing size-graded quartzite grains and a small amount of lime (CaO) flux at a temperature of 1450°C: the final structure consists of tridymite, cristobalite and a minimal amount of unconverted quartz. Tridymite is preferred to cristobalite because of the large ...
The specific heat of Palisades (quartz) diabase at liquid helium temperatures is found to be very similar to that of lunar rocks 10017 and 10046 and to be ... JA Morrison,PR Norton - 《Journal of Geophysical Research》 被引量: 11发表: 1971年 Thermodynamically consistent equilibrium properties...
EPR of a hydrogen/double-lithium centre in α-quartz X-band electron paramagnetic resonance experiments on a gamma-irradiated 伪-quartz crystal have revealed a new hydrogarnet-like defect. Analysis of the spe... NS Lees,CJ Walsby,JAS Williams,... - 《Physics & Chemistry of Minerals》 被引量...