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Topic: Wurtzite

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	Probert Encyclopaedia: Rocks and Minerals (W-Z) (Site not responding. Last check: 2007-10-20)
		Wurtzite is a rare mineral formed mainly with other sulphide ores in hydrothermal veins.
		Wurtzite has an unusual crystal symmetry which can be either hexagonal or trigonal depending upon how the specimen formed.
		Wurtzite is a minor ore of zinc and was confirmed as a distinct species of mineral in 1861 and named after Karl Wurtz, the French chemist.
	www.probertencyclopaedia.com /HM.HTM (1224 words)

	Collecting Wurtzite Crystals Negley Ohio
		Wurtzite crystal clusters(non-radiating) occur in the septaria at Negley usually, but not always, in combination with radiating crystal groups and single crystals.
		Of all the Wurtzite specimens locked inside the septaria at Negley, acicular crystals are by far the most difficult to locate and properly trim.
		Hollenbaugh, D.W., and Carlson, E.H., 1983, The occurrence of Wurtzite
	www.vasichkominerals.com /wurtz.htm (2334 words)

	Boron Nitride Products: Wurtzite Boron Nitride (WBN)
		Wurtzite Boron Nitride is a new superabrasive material that is manufactured by detonation.
		Wurtzite Boron Nitride with plate shape particles is used as a raw material for sintering coarse grit polycrystalline structure powders, which are later used for manufacturing traditional cutting and grinding tools.
		Wurtzite Boron Nitride with regular crystal shape particles is the perfect material for steel polishing applications, such as, molds, dies, etc.
	www.ukabrasives.com /products/products8.html (209 words)

	WURTZITE (Zinc Iron Sulfide)
		Wurtzite is the not so common cousin of the much more common mineral, sphalerite.
		The tetrahedrons in wurtzite all are oriented in one direction and produce the hexagonal (six fold rotational) symmetry.
		Crystals of wurtzite are typically six sided pyramids where the hemimorphic character is easily seen as the top of the crystal is the point and the bottom of the crystal is the pyramid's base.
	mineral.galleries.com /minerals/sulfides/wurtzite/wurtzite.htm (421 words)

	Structural and optical properties of CdSe nanoparticles through mechanical or chemical alloying
		Meanwhile, the phase transition for CdSe nanocrystals from wurtzite structure to zinc blende structure during ball milling process was observed.
		Wurtzite structural CdSe particles are the main products during the initial stage of ball milling process (from begin to 2 hours).
		These particles have wurtzite structure, whose bulk bandgap is 1.751 eV (708nm), indicating that the particle size is near its Bohr exciton radius.
	www.foresight.org /conference/MNT10/Abstracts/Tan/index.html (482 words)

	The mineral wurtzite
		Wurtzite is a very rare mineral, and is only of value to scientists and mineral collectors.
		Wurtzite occurs in Oruro and Potosi, Bolivia; Tsumeb, Namibia; Tuscany, Italy; and Pribam, Czechoslovakia.
		Intergrowths of Wurtzite, Sphalerite, and Galena ("Schalenblende") occur in the the lead mines of Reynolds Co., Missouri.
	www.minerals.net /mineral/sulfides/sphaleri/wurtzite.htm (143 words)

	LookSmart - Search results for "Wurtzite" (Site not responding. Last check: 2007-10-20)
		Scan the chemical and empirical formulas, the physical and optical properties, the crystallography, and the classification of the mineral known as wurtzite.
		Look at a photo of the mineral known as wurtzite, find the crystal system, the location where it is found, and the formula.
		Wurtzite ZnS Wurtzite crystals - 3mm Photo by Gilles Haineault Gilles Haineault Two polytypes of wurtzite are found at MSH, -2H is rare and -4H is very rare.
	www.looksmart.com /r_search?look=&key=Wurtzite (347 words)

	Polymorf - Knowhwere- Wurtzite (Site not responding. Last check: 2007-10-20)
		In the wurtzite structure A atoms occupy fifty percent of the interstitial voids of
		Wurtzite is the high temperature polymorph of the FCC
		The increased excitation of the atoms caused by
	www.polymorf.net /matter23.htm (224 words)

	MIJ-NSR Vol. 5S1, Art. W11.13, Maziar Farahmand and Kevin Brennan (Site not responding. Last check: 2007-10-20)
		It is found that the calculated breakdown voltage for the wurtzite device is considerably higher than that calculated for a comparable GaN zincblende phase device.
		The higher breakdown voltage of the wurtzite phase device is attributed to the higher density of electronic states for this phase compared to the zincblende phase.
		The corresponding quantities for the wurtzite GaN device are calculated to be 160GHz and 158 mS/mm.
	nsr.mij.mrs.org /5S1/W11.13 (247 words)

	Adsorption is key to doping nanocrystals (July 2005) - News - nanotechweb.org
		Nanocrystals with a wurtzite structure, such as cadmium selenide, or a rock-salt structure, for example lead sulphide and lead selenide, were much more difficult or even impossible to dope.
		The team also grew cadmium selenide with a zinc-blende structure, rather than its normal wurtzite structure, by depositing a shell of the material around a zinc selenide core.
		Growing cadmium selenide nanocrystals under the same surfactant conditions as zinc selenide - which is relatively easy to dope - resulted in doping of the wurtzite structure cadmium selenide with 0.14% manganese.
	www.nanotechweb.org /articles/news/4/7/6/1 (508 words)

	Chemical Bonding Concept/Skills Development (Site not responding. Last check: 2007-10-20)
		If a set of layers that students construct are permanently glued together prior to the activity, the task of helping students with coordination number, layer orientation, etc., is greatly simplified.
		The coordination number of each sodium ion is 6, which is also the coordination number of each chloride ion.
		The coordination number of sulfide ion is 4; it's also the coordination number of zinc ion in the Wurtzite lattice.
	www.okstate.edu /jgelder/bondpage18.html (497 words)

	INEEL BES Program - Surface Reconstructions of Compound Semiconductors (Site not responding. Last check: 2007-10-20)
		This research addresses the atomic and electronic nature of surface reconstructions and the vital role it plays in initiating island growth on the nanometer scale that is necessary for the formation of self-assembled nanostructures in many cases.
		Zinc blende and wurtzite compounds surface reconstructions will be studied to demonstrate how the detailed nature of the reconstructions themselves effect homoepitaxial and heteroepitaxial growth on compound semiconductor surfaces for both smooth, layer-by-layer growth, and self-assembled nanostructure growth.
		In a parallel study, the detailed atomic structure of wurtzite compound semiconductors will be investigated.
	www.inel.gov /env-energyscience/materials/semiconductors.shtml (425 words)

	Alan Guisewite's Mineral Collection Images: Sphalerites Page
		Sphalerite is also trimorphic with wurtzite and matraite.
		Wurtzite's the second and rarer member of the sphalerite trimorphs (the third being matraite)- this one's from the Mines Les Malines, St Laurent-le-Minier, Gard, Languedoc-Roussillon, France and has tetrahedrites on the back side.
		Tiny sharp wurtzite crystals from the Metrel Inc. Negley strip mine, Negley, Columbiana County, Ohio.
	www-2.cs.cmu.edu /~adg/adg-psimages.html (2181 words)

	CCSD thèses-EN-ligne: First-Principles study of Structural, Elastic and Electronic Properties of AlN and GaN ...
		Pour le calcul des propriétés structurales et électroniques dans les phases wurtzite et zinc blende, nous avons utilisé les deux approximations de la densité locale (LDA) et du gradient généralisé (GGA).
		The study is focused on the first-principles all electron full-potential linearized / augmented plane wave plus local orbitals calculations within the density-functional theory.
		The results of bulk properties, including lattice constants, bulk modulus and derivatives and band structures are obtained and compared using both local density approximation (LDA) and the generalized gradient approximation (GGA) for the exchange-correlation functional for the both zincblende and wurtzite AlN and GaN.
	tel.ccsd.cnrs.fr /documents/archives0/00/00/96/54/index.html (1345 words)

	SeqQuest Input Reference Manual
		It starts with a very simple input file to look at the clean bulk-terminated surface, illustrates the use of successively more sophisticated input options to aid ease of use and trigger additional functionality in the code, and deals with some of the special issues that arise in designing slab calculations to examine chemistry at surfaces.
		This Tutorial discusses the construction of an input file for a bulk wurtzite gallium-nitride crystal.
		It begins with a very simple (and flawed) input file, and illustrates the use of successively more sophisticated input to aid ease of use and to trigger additional functionality in the code.
	www.cs.sandia.gov /%7Epaschul/Quest/SeqQ_Input_Manual.html (460 words)

	MIJ-NSR Vol. 1, Art. 14, L. Bellaiche et al. (Site not responding. Last check: 2007-10-20)
		The pressure variation of the bandgap, at the isostructural phase transition of wurtzite InN, is determined theoretically, using the first-principles total-energy pseudopotential method.
		It is found that the bandgap (as well as the structural parameters) exhibit three different types of behavior, in three regions of pressure.
		Optical experiments at low temperatures could then be employed to directly identify the two different wurtzite phases of InN.
	nsr.mij.mrs.org /1/14 (123 words)

	Crystal Structure of Wurtzite (Site not responding. Last check: 2007-10-20)
		Zinc sulfide crystallizes in two different forms: Wurtzite and Zinc Blende.
		If the sulfide ions originally adopt a hexagonal closest-packed structure, the ZnS crystal is Wurtzite.
		The yellow spheres represent the sulfide ions and the blue spheres represent the zinc(II) ions.
	www.chm.davidson.edu /ChemistryApplets/Crystals/IonicSolids/Wurtzite.html (260 words)

	Papers and Publications (Site not responding. Last check: 2007-10-20)
		Wurtzite ZnS nanosaws produced by polar surfaces D. Moore, C. Ronning, C. Ma, and Z. Wang, Chem.
		Nanobelts, Nanocombs and Nano-windmills of Wurtzite ZnS, C. Ma, D.
		Wurtzite ZnS Nanostructures: Synthesis and Characterization, Oral Presentation, ACS 77th Colloid and Surface Science Symposium, Georgia Institute of Technology, Atlanta, GA, 2003
	www.danielfmoore.com /papers.html (230 words)

	Directory of open access journals
		We investigate the con.nement properties of GaN/Al xGa1-xN zincblende and wurtzite nonabrupt quantum wells (QWs) in an electric field.
		It is shown that their Stark shifts decrease considerably when the existence of nonabrupt interfaces are considered.
		In all cases, the electric field effects in GaN/Al xGa1-xN wurtzite QWs are stronger than in similar zincblende QWs.
	www.doaj.org /abstract?id=35794&toc=y (118 words)

	znmgse
		The material shows a transition from sphalerite to wurtzite structure with increasing x.
		Within the transition range, near x=0.19, regular and irregular sequences of hexagonal and cubic stacking grow.
		Se in sphalerite (3C, x=0.15), a), and wurtzite (2H, x=0.21), b), structure.
	www.tu-chemnitz.de /physik/AFKO/znmgse.html (375 words)

	Nanocristaux de CdS
		La Figure 6.6 compare des images calculées de particules triangulaires pour quatre structures différentes: Wurtzite, Zinc-Blende et deux structures intermédiaires (Wurtzite avec 1 défaut d'empilement et Zinc-Blende avec 1 défaut d'empilement).
		Pour la structure Wurtzite avec un défaut d'empilement (G) la réflexion interne devient plus importante et, pour la structure Wurtzite, elle devient la plus importante (H).
		Lorsque les images à haute résolution sont simulées avec les mêmes angles de tilt pour une structure de type Wurtzite avec un défaut d'empilement, une structure Zinc-Blende avec un défaut d'empilement ou une structure de type Zinc-Blende pure, on obtient des PS à des angles de tilt de ±31,6° très différents des PS expérimentaux.
	www.pinna.cx /these/thesehtml006.html (4430 words)

	Diamond or Silicon Molecular Model Kit (Site not responding. Last check: 2007-10-20)
		This model is built using 20mm bonds so that the scale is compatible with the graphite model.
		This kit can also be used to build Lonsdaleite, another form of carbon similar in structure to wurtzite.
		The silicon model is identical but uses grey atoms & 30mm bonds (for proper scale).
	www.indigo.com /models/gphmodel/diamond-model-W.html (140 words)

	Wurtzite Boron Nitride Powder from READE
		Wurtzite boron nitride is produced in two different particle shapes: plate and regular crystal
		wurtzite boron nitride powder, WBN, wurtzite boron nitride powder, WBN, wurtzite boron nitride powder, WBN
		For sintering coarse grit polycrystalline structure powders, which are later used for manufacturing traditional cutting and grinding tools.
	www.reade.com /Products/Nitrides/wurtzite.html (168 words)

	Zinc Sulfide/ Sulphide Powder from READE
		zinc sulfide, ZnS, sphalerite; wurtzite; Zinc monosulfide; Irtran-2; Cleartran; zinc sulfide, ZnS, sphalerite; wurtzite; Zinc monosulfide; Irtran-2; Cleartran
		Synonyms: Zinc sulfide, ZnS, Sphalerite; wurtzite; Zinc monosulfide; Irtran-2; Cleartran
		Zinc Sulfide occurs naturally as "blend," and is prepared directly from the elements and by precipitation of a zinc salt solution with ammonium sulfide.
	www.reade.com /Products/Sulfides/zinc_sulfide.html (211 words)

	Wurtzite Gallery
		Brownish-grey, metallic wurtzite vein in quartz matrix with grey galena.
		0.7mm Prismatic hexagonal crystal group of wurtzite, with pale green clinochlore on quartz.
		Much of the wirtzite from Butte is actualy Sphalerite pseudomorphs after wurtzite.
	www.mindat.org /gallery.php?min=4318 (287 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Comment: Intensities do not match JCPDS data well.
		Optically, a large proportion of a colorless phase with poor cleavage and high birefringence - presumably the wurtzite.
		In the powder used for the X-ray data, the colorless phase is much coarser than the opaque(s).
	speclab.cr.usgs.gov /spectral.lib04/DESCRIPT/cobaltite.264.html (127 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		The inset shows a reflection from the top plane.
		An X-ray pole figure of {101} reflections on the top plane demonstrated a clear 6-fold symmetry and X-ray diffraction showed only a (0002) peak, indicating that the top plane is the {0001} plane of wurtzite AlN.
		This photo is the winning entry of the Photo Contest at the 14th International Conference on Crystal Growth (ICCG-14) in Grenoble, France, and is provided courtesy of Prof.
	pubs.acs.org /crystal/articleWindow.html (88 words)

	Wurtzite Mineral Data
		Comments: Compact, dark, metallic crystals of wurtzite intermixed with galena crystals and white barite blades.
		Deep reddish brown to dark brown to brown-fl; yellow to dark brown internal reflections.
		Calculated Relative Intensity Colors of Wurtzite in Air
	www.webmineral.com /data/Wurtzite.shtml (284 words)

	Selective Growth of PbSe on One or Both Tips of Colloidal Semiconductor Nanorods (Site not responding. Last check: 2007-10-20)
		PbSe nanocrystals with rock-salt structure are grown on the tips of colloidal CdS and CdSe nanorods.
		The facets of wurtzite rods provide a substrate with various degrees of reactivity for the growth of PbSe.
		The presence of dangling Cd bonds may explain subtle differences between nonequivalent facets resulting in the selective nucleation of PbSe only on one of the two tips of each CdS rod.
	pubs.acs.org /cgi-bin/abstract.cgi/nalefd/2005/5/i03/abs/nl048060g.html (160 words)

	MSH-Wurtzite
		Two polytypes of wurtzite are found at MSH, -2H is rare and -4H is very rare.
		Both polytypes exhibit weak fluorescence, -2H fluoresces red while -4H fluoresces orange.
		II/C.13-10 - Sulfides and sulfosalts; sulfides with metal: S, Se and Te = 1:1 ; wurtzite series
	www.saint-hilaire.ca /en/wurtzit.htm (117 words)

	WURTZITE Specimens (Site not responding. Last check: 2007-10-20)
		A small shard of fl rock is host to a sparkly druze of wurtzite crystals.
		A loupe reveals their transparent nature and hexagonal crystal form.
		Only the smallest crystals exhibit the hemimorphism which is diagnostic for wurtzite over sphalerite.
	mineral.galleries.com /scripts/item.exe?FORSALE+Minerals+Sulfides+WURTZITE (109 words)

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