Single crystal growth of akermanite (Ca2MgSi2O7) and gehlenite (Ca2Al2SiO7) by the floating zone method

Nobuo,; Shindo, Isamu

doi:10.1016/0022-0248(79)90047-2

Cited by 26 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Space group [33] five-dimensional space group P 421m : p4mg Modulation wave vectors [33] k 1 = q(a * + b * ), k 2 = q(-a * + b * ), q = 0.280 at 297 K Unit cell parameters, Å [33] a = b = 7.8348(3); c = 5.0087(2) Number of formula units per unit cell [33] Z = 2 Density, g/cm 3 [33] 2.945 Temperature of phase transition N ↔ IC, K [25,31,33,34,[36][37][38] given in a range between 355 K and 360 K Melting point of Ca 2 MgSi 2 O 7 , K [39] ≈ 1723 Method of crystal growth Czochralski [35,40], floating zone [41,42] Hardness (Mohs scale) ≈ 5.5 [43] Elastic constants c ij , 10 10 N/m 2 [44] (see also [45]) Linear optical character uniaxial positive (n o < n e ) Nonlinearities χ (2)…”

Section: Characteristicmentioning

confidence: 99%

Stimulated emission (4F3/2 → 4I11/2 channel) with LD and Xe-flashlamp pumping of tetragonal, incommensurately modulated Ca2MgSi2O7:Nd3+(Na+) - a new disordered laser crystal

et al. 2010

View full text Add to dashboard Cite

Non‐centrosymmetric tetragonal crystalCa2MgSi2O7:Nd3+(Na+) with incommensurately modulated melilite‐type structure is presented as a new laser crystal. By LD and Xe‐flashlamp pumping its CW and free‐running pulsed stimulated emission of the 4F3/2 → 4I11/2 generation channel of Nd3+ lasant ions was excited. (© 2010 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)

show abstract

Section: Characteristicmentioning

confidence: 99%

Stimulated emission (4F3/2 → 4I11/2 channel) with LD and Xe-flashlamp pumping of tetragonal, incommensurately modulated Ca2MgSi2O7:Nd3+(Na+) - a new disordered laser crystal

et al. 2010

View full text Add to dashboard Cite

show abstract

“…In this study, we focused on the calcium aluminate silicate Ca 2 Al 2 SiO 7 (CAS) single crystal as a new candidate for high-temperature applications. CAS, known as gehlenite by its mineral name, can be grown from a melt using the Cz method, 16) and has been studied for laser and/or longpersistence phosphor applications. 17,18) The CAS crystal belongs to the non-centrosymmetric tetragonal space group P 42 1 m, 19) and thus it should exhibit piezoelectricity without pyroelectricity.…”

Section: Introductionmentioning

confidence: 99%

Growth and Characterization of Ca₂Al₂SiO₇ Piezoelectric Single Crystals for High-Temperature Sensor Applications

Hagiwara

Noguchi

Hoshina

et al. 2013

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The electrical properties of a piezoelectric single crystal of calcium aluminate silicate Ca2Al2SiO7 (CAS) were studied at elevated temperatures and its applicability to high-temperature pressure sensors was investigated. The CAS bulk single crystal was grown by the Czochralski method. The piezoelectric d 14 and d 36 constants were respectively evaluated as 6.04 and 4.04 pC/N by the resonance and antiresonance method. The temperature dependence of the piezoelectric constant was investigated at temperatures up to 500 °C. The electrical resistivity at 800 °C was on the order of 108 Ω·cm along both the crystallographic a- and c-axes. The measurement of direct piezoelectric response at 700 °C demonstrated that the CAS crystal could detect a pseudo-combustion pressure change of an automobile engine. Our observations suggest that CAS crystals are superior candidates for sensing pressure at high temperatures.

show abstract

“…Selection criteria were grain size, clearness, optical homogeneity and low birefringence, to facilitate optic axial angle measurements on the universal stage. Synthetic ~kermanite and gehlenite were used as standards for Ca, Si, and A1 (Ii and Shindo, 1979). St John's Island olivine was taken as a standard for Fe.…”

Section: Fe Contentmentioning

confidence: 99%

The iron content and optic axial angle in zoisites from Galicia, NW Spain

Maaskant

1985

Mineral. mag.

View full text Add to dashboard Cite

ABSTRACT. Electron probe microanalyses of zoisites from high-grade metamorph, ic rocks in Galicia, NW Spain have been obtained. The elements Na, Mg, P, K, Ti, and Mn were not detected above the 0.1 wt. ~ level. Assuming all Fe is present as Fe 3+, a clear relation is obtained between the Fe content and the optic axial angle. Zoisite with 1.6 wt. ~o Fe203 proves to be uniaxial at 589 rim; uniaxiality in blue light (470 nm) lies at 1.5 wt. Fe203. A change of the optic sign, from positive to negative, is obtained at 2.9 wt. ~o Fe_~O3. The presence of minor elements greatly affects this relation, as is indicated by analyses of sector-zoned Sr-bearing zoisites of a muscovite-zoisite pegmatite from the same region. Under retrograde conditions Fe-rich ct-zoisite reacts to form less Fe-rich ~t-zoisite or fl-zoisite and clinozoisite.KnYWORDS: zoisite, metamorphism, optic axial angle, iron, Galicia, Spain.T HE existence of two types of zoisite with different optical orientations was first recognized by Termier (t898, 1900). The two types are named a-zoisite and fl-zoisite after the vibration direction which lies parallel to the crystallographic b-axis, along which zoisite is usually prismatically developed, a-zoisite has ct, t, and 7 parallel to b, a, and c, respectively; OAP parallel to (100), varying 2V~ and strong rhombic dispersion r << v. fl-zoisite has ~, t, and 7 parallel to a, b, and c, respectively; OAP parallel to (010) and perpendicular to the cleavage (100), varying 2Vr and rhombic dispersion r > v.These data are usually given in literature on zoisite mineralogy and in determinative tables (Myer, 1966;Saggerson, 1975;Tr6ger, 1982). Deer et al. (1967) and Battey (1975) give a reverse dispersion scheme for both ~-and fl-zoisites. Vogel and Bahezre (1965) note the existence of a zoisite with a large 2V~ with rhombic dispersion r >> v.The connection between the two types of zoisite and their ferric iron content has been much debated (Phillips and Griffen, 1981;Saggerson, 1975; Termier, 1900;Winchell and Winchell, 1959). A relation, which nowadays is generally accepted has been given by Myer (1966) , with later confirmation by Enami and Banno (1977). Myer analysed fiveCopyright the Mineralogical Society non-manganiferous zoisites and measured the optic axial angle 2Vr in Nao light; his data are given in fig. 1. ct-zoisite is generally considered to be the hightemperature zoisite, occurring as a primary mineral in eclogitic rocks of various compositions, whereas during retrograde metamorphism fl-zoisite forms (Raith, 1976;Richter, 1973;Vogel, 1967).The present study was undertaken to refine the extrapolated curves of Myer and of Enami and Banno. Seventeen zoisite-bearing samples were collected from Cabo Ortegal, Galicia, NW Spain. a-zoisite occurs as a stable phase, together with omphacite, garnet and brownish pargasitic hornblende in ~t-zoisite eclogites, ct-zoisite hornblende eclogite and ~-zoisite hornblende pyrigarnites. The primary metamorphic character of the mineral may be deduced from the fact that it oc...

show abstract

Single crystal growth of akermanite (Ca2MgSi2O7) and gehlenite (Ca2Al2SiO7) by the floating zone method

Cited by 26 publications

References 7 publications

Stimulated emission (4F3/2 → 4I11/2 channel) with LD and Xe-flashlamp pumping of tetragonal, incommensurately modulated Ca2MgSi2O7:Nd3+(Na+) - a new disordered laser crystal

Stimulated emission (4F3/2 → 4I11/2 channel) with LD and Xe-flashlamp pumping of tetragonal, incommensurately modulated Ca2MgSi2O7:Nd3+(Na+) - a new disordered laser crystal

Growth and Characterization of Ca₂Al₂SiO₇ Piezoelectric Single Crystals for High-Temperature Sensor Applications

The iron content and optic axial angle in zoisites from Galicia, NW Spain

Contact Info

Product

Resources

About

Single crystal growth of akermanite (Ca2MgSi2O7) and gehlenite (Ca2Al2SiO7) by the floating zone method

Cited by 26 publications

References 7 publications

Stimulated emission (4F3/2 → 4I11/2 channel) with LD and Xe-flashlamp pumping of tetragonal, incommensurately modulated Ca2MgSi2O7:Nd3+(Na+) - a new disordered laser crystal

Stimulated emission (4F3/2 → 4I11/2 channel) with LD and Xe-flashlamp pumping of tetragonal, incommensurately modulated Ca2MgSi2O7:Nd3+(Na+) - a new disordered laser crystal

Growth and Characterization of Ca2Al2SiO7 Piezoelectric Single Crystals for High-Temperature Sensor Applications

The iron content and optic axial angle in zoisites from Galicia, NW Spain

Contact Info

Product

Resources

About

Growth and Characterization of Ca₂Al₂SiO₇ Piezoelectric Single Crystals for High-Temperature Sensor Applications