Crystal structure and dielectric properties of (Pb1−xCax)(Zr1−ySny)O3 ceramics

Chung, Tae-Serk; Kim, Ho–Gi

doi:10.1007/bf00687280

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…Chung und Kim beschrieben wenige Jahre später Phasen der Zusammensetzung (Pb 1– x Ca x )(Zr 1– y Sn y )O 3 ( x = 0.3; 0.325; 0.35; 0.375 und y = 0; 0.1; 0.2; 0.3). Hier steht Ca 0.3 Pb 0.655 ZrO 3 39 im Blickpunkt der Strukturbeschreibung. Diese Zusammensetzung weicht nur wenig von der soeben beschriebenen (Ca 0.5 Pb 0.5 ZrO 3 ) ab.…”

Section: B Erdalkalimetall‐oxozirconateunclassified

Effect of heat treatment on the structural and conformational changes of regenerated Antheraea pernyi silk fibroin films

Kweon¹,

Woo²,

Park³

2001

J of Applied Polymer Sci

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Regenerated Antheraea pernyi silk fibroin films prepared from calcium nitrate solution were treated with heat for crystallization. The structural and conformational changes caused by heat treatment were investigated with X‐ray diffraction, infrared spectroscopy, and differential scanning calorimetry. The temperature and treatment time of heat greatly influenced the conformation of the regenerated films. The conformational change was caused by heat treatment over 230°C, and the transition was enhanced by increasing time and temperature. The contents of α‐helix, β‐sheet, and random‐coil conformations were calculated and examined to investigate the effect of heat treatment on the conformational changes. The β‐sheet structure could be transformed from a random‐coil conformation on heat treatment, whereas the content of α‐helix structure was nearly unchanged, regardless of heat‐treatment conditions. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2271–2276, 2001

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Section: B Erdalkalimetall‐oxozirconateunclassified

Effect of heat treatment on the structural and conformational changes of regenerated Antheraea pernyi silk fibroin films

Kweon¹,

Woo²,

Park³

2001

J of Applied Polymer Sci

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Zur Kristallchemie der Alkali‐, Erdalkali‐, Selten Erdmetall‐Oxozirconate und Zirconiumoxide

Müller‐Buschbaum

2010

Zeitschrift anorg allge chemie

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The contribution on oxozirconates gives a view on the crystal chemistry of zirconium compounds with large cations, like alkaline, alkaline‐earth and rare earth elements. This is completed by a short overview of the structure types of ZrO2 synthesized by different methods, temperatures and pressures. The most important observation is the missing reflection of the coordination chemistry of zirconiumoxides into the oxozirconates. Usual coordination numbers of zirconium in zirconiumoxide are CN = 8 and occasionally CN = 9. The described oxozirconates instead show mainly octahedral (CN = 6) coordination (such as Li2ZrO3, K2Zr2O5, Li0.8K0.9(LiMgZr)Zr2O6.5, Li6Zr2O9, K4Zr5O12, K2Li14Zr3O14, Pb0.5Ca0.5ZrO3, Nd2Zr2O7, BaCexZr1–xO3). Exceptions with the coordination number six exhibit trigonal ZrO6‐prisms (K4Zr5O12). This facts result in the observation, that zirconium is a member of the anionic parts of the crystal structures. Lower coordination spheres are enforced by the cations. The larger a cation and the larger its amount in the chemical composition is, the lower the coordination number of zirconium gets. For example: CNZr = 5 (tetragonal pyramid) in K2ZrO3, Cs2ZrO3; CNZr = 4 (tetrahedron) in Cs4ZrO4. Furthermore, Zr4+ can also be found in statistical distribution with ions of the same size, like Li+ and Mg2+. Calculations of the Madelung part of lattice energies of zirconium oxides show unexpected uniform data, independent from shape and size of the coordination polyhedra.

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The dielectric properties of (Pb,Ca)(Zr,Ti)O3 solid solution at microwave frequency

Huang

Weng

Lin

et al. 2000

Materials Research Bulletin

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Crystal structure and dielectric properties of (Pb1−xCax)(Zr1−ySny)O3 ceramics

Cited by 5 publications

References 8 publications

Effect of heat treatment on the structural and conformational changes of regenerated Antheraea pernyi silk fibroin films

Effect of heat treatment on the structural and conformational changes of regenerated Antheraea pernyi silk fibroin films

Zur Kristallchemie der Alkali‐, Erdalkali‐, Selten Erdmetall‐Oxozirconate und Zirconiumoxide

The dielectric properties of (Pb,Ca)(Zr,Ti)O3 solid solution at microwave frequency

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