TEM imaging of polytypism in pseudowollastonite

Ingrin, Jannick

doi:10.1007/bf00202250

Cited by 15 publications

(9 citation statements)

References 8 publications

(17 reference statements)

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“…The psW structure showed a characteristic pattern of repeating contrast‐like enhancements caused by specific arrangements of two layers composed of tetrahedra of Si and O atoms followed by a layer containing Ca. A similar structure was reported by Ingrin (1993) for synthetic polycrystalline pseudowollastonite.…”

Section: Resultssupporting

confidence: 85%

Electron microscopy of interfaces in a wollastonite — tricalcium phosphate bioeutectic®

Aza

Luklinska

Anseau

et al. 1998

Journal of Microscopy

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SummaryThe study investigated the morphology and structure of interfaces between a pseudowollastonite (psW) and atricalcium phosphate (a-TCP) eutectic ceramic material (Bioeutectic®) obtained by slow solidification (0·5 ЊC h -1 ) through the eutectic temperature region (1402 Ϯ 3 ЊC) of the binary system.The eutectic material contained 60 wt% psW and 40 wt% a-TCP and was composed of spherical colonies formed by alternating radial lamellae of psW and a-TCP phases. Small quantities of impurities were found to affect the microstructure and ultrastructure of adjacent colonies. The observations showed the presence of dislocation loops and dislocation pairs in the psW phase away from the interfaces with a-TCP. The a-TCP phase remained defect-free. Two types of interface were identified between the triclinic hightemperature form of wollastonite (psW) and orthorhombic a-TCP.In single colonies, the phases were aligned with [011 ]psW and [001 ] a-TCP. High-resolution electron microscopy revealed differences in morphologies between the two interfaces, and showed that the lattice planes in the interfaces were defect-free.

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Section: Resultssupporting

confidence: 85%

Electron microscopy of interfaces in a wollastonite — tricalcium phosphate bioeutectic®

Aza

Luklinska

Anseau

et al. 1998

Journal of Microscopy

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“…At high pressure and temperature (~3.0 GPa and 1100 °C), CaSiO 3 transforms to a walstromite-II phase (Trojer 1969) and further transforms to perovskite above 10 GPa (Ringwood and Major 1967;Liu and Ringwood 1975). Owing to different stacking sequence of octahedral layers and ternary rings, various polytypes could exist in pseudowollastonite (Yamanaka and Mori 1981;Ingrin 1993). However, because of the difficulties in preparation of good quality single crystals (Jeffery and Heller 1953;Yamanaka and Mori 1981;Matteson 1983;Ingrin 1993;Richet et al 1998), few investigations have been performed to characterize polytype structures in pseudowollastonite.…”

Section: Introductionmentioning

confidence: 96%

“…Owing to different stacking sequence of octahedral layers and ternary rings, various polytypes could exist in pseudowollastonite (Yamanaka and Mori 1981;Ingrin 1993). However, because of the difficulties in preparation of good quality single crystals (Jeffery and Heller 1953;Yamanaka and Mori 1981;Matteson 1983;Ingrin 1993;Richet et al 1998), few investigations have been performed to characterize polytype structures in pseudowollastonite.…”

Section: Introductionmentioning

confidence: 97%

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Crystal structure and compressibility of a two-layer polytype of pseudowollastonite (CaSiO₃)

Yang

Prewitt

1999

American Mineralogist

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“…This polymorph is stable above 1125 J. Ingrin (1993) [115] has investigated the polytypism in synthetic polycrystalline pseudowollastonite using conventional and high-resolution transmission electron microscopy (TEM and HRTEM). He has found three polytypes of 2, 4, and 6-layers that coexist in the one sample in the form of lamellae parallel to (001).…”

Section: Pseudowollastonite (β-Casio 3 )mentioning

confidence: 99%

Production of synthetic polycrystals of CaSiO3 and their study as new detectors of gamma radiation, thermal neutrons and accelerated ions.

Lorenzo¹

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Em especial ao prof. Shigueo Watanabe pela sua orientação, paciência, disposição e apoio no desenvolvimento deste trabalho, incentivando a maioria das minhas decisões, agradeço muito. Ao Conselho Nacional de desenvolvimento Científico e Tecnológico (CNPq) pelo apoio financeiro. À Eng. Elizabeth Ribeiro Somessari, ao Eng. Carlos Gaia da Silveira do CTR-IPEN-SP; ao Aldo Oliveira e Vicente de Paulo Campos do GMR-IPEN-SP pelas inúmeras vezes que nos atenderam gentilmente para as irradiações gama realizadas neste trabalho. À Professora Carmen Cecilia Bueno do Centro de Tecnologia das Radiações-IPEN pela ajuda nas irradiações com nêutrons no reator nuclear de pesquisa IEA-R1 do IPEN. Ao Prof. Gundu Rao pela análise das medidas de EPR as quais ajudaram muito no aprimoramento do presente trabalho, e pela ajuda na revisão do inglês. Ao prof. Satoshi Kodaira do Instituto Nacional de Ciências Radiológicas (NIRS) em Chiba-Japão e à Dra. Luana Nascimento do Centro Belga de Pesquisa Nuclear (SCK•CEN) pela ajuda nas irradiações das nossas amostras com prótons e íons de carbono no NIRS. Ao Prof. Sergey Nikiforov e à colega Daria Ananchenko do Instituto de Física e Tecnologia da Universidade Federal dos Urais em Ecaterimburgo-Rússia por me aceitar no seu laboratório como parte de um estágio de pesquisa. ii Ao Dr. Tássio A. Cavalieri do Centro de Engenharia Nuclear do Instituto de Pesquisas Energéticas e Nucleares (CEN-IPEN-SP) pela importante colaboração e ajuda com as simulações de Monte Carlo. À Nancy Kuniko Umisedo do Laboratório de Dosimetria do IFUSP pelas irradiações com raios X. Aos Professores Nilo Cano, René Rojas e Fernando Chubaci pela paciência, compreensão e pela sua disponibilidade para responder às minhas dúvidas no desenvolvimento deste trabalho. À Dra. Roseli Gennari pela ajuda na mistura das amostras e pelas sugestões na produção dos policristais usados neste trabalho. À Edna Toledo pela ajuda e disposição nos processos burocráticos e os muitos momentos agradáveis na hora do café no LACIFID.

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TEM imaging of polytypism in pseudowollastonite

Abstract: Abstract.A study of polytypism in synthetic polycrystal-

Cited by 15 publications

References 8 publications

Electron microscopy of interfaces in a wollastonite — tricalcium phosphate bioeutectic®

Electron microscopy of interfaces in a wollastonite — tricalcium phosphate bioeutectic®

Crystal structure and compressibility of a two-layer polytype of pseudowollastonite (CaSiO₃)

Production of synthetic polycrystals of CaSiO3 and their study as new detectors of gamma radiation, thermal neutrons and accelerated ions.

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TEM imaging of polytypism in pseudowollastonite

Abstract: Abstract.A study of polytypism in synthetic polycrystal-

Cited by 15 publications

References 8 publications

Electron microscopy of interfaces in a wollastonite — tricalcium phosphate bioeutectic®

Electron microscopy of interfaces in a wollastonite — tricalcium phosphate bioeutectic®

Crystal structure and compressibility of a two-layer polytype of pseudowollastonite (CaSiO3)

Production of synthetic polycrystals of CaSiO3 and their study as new detectors of gamma radiation, thermal neutrons and accelerated ions.

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Crystal structure and compressibility of a two-layer polytype of pseudowollastonite (CaSiO₃)