Scanning electron microscope studies of local variations in cathodoluminescence in striated ZnS platelets

Datta, S.; Yacobi, B. G.; Holt, D. B.

doi:10.1007/bf00553927

Cited by 17 publications

(3 citation statements)

References 26 publications

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“…5 have been observed before in single-crystal ZnS at larger scales and are ascribed to polytypic sequences. 34,35 Before the current study, bands observed in CVD ZnS 36,37 have not been analyzed to determine their crystallographic significance. The diffraction results of Fig.…”

Section: Resultsmentioning

confidence: 99%

Effects of Temperature, Pressure, and Metal Promoter on the Recrystallized Structure and Optical Transmission of Chemical Vapor Deposited Zinc Sulfide

McCloy

Korenstein

Zelinski

2009

Journal of the American Ceramic Society

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Structural changes from processing in polytype‐rich zinc sulfide (ZnS) are complex and poorly understood. In this study, recrystallization was induced in chemical vapor deposited ZnS by annealing and hot isostatic pressing (HIPping). Samples were characterized using optical microscopy, SEM, TEM, electron diffraction, polycrystalline and powder X‐ray diffraction, and transmission spectroscopy. Recrystallization was found to reduce the hexagonality and increase the {111} texture of as‐deposited ZnS. Changes in hexagonality and texture can occur independently of each other. HIPped ZnS with superior transmission exhibits both a change in texture and a reduction in hexagonal content. Reduction in hexagonality, alone, was not sufficient to improve optical transmission from the visible to the infrared. For the first time, the effects of pressure, temperature, and the presence of platinum on recrystallization during commercial ZnS HIPping are separated and identified. Platinum was found to actively promote recrystallization and silver demonstrated a similar effect. Several theories focusing on the unique polytypic nature of ZnS are offered to explain the changes in structure and properties occurring during recrystallization. These findings contribute to a broader understanding of the nature of order–disorder and martensitic phase transformations in ceramic materials.

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Section: Resultsmentioning

confidence: 99%

Effects of Temperature, Pressure, and Metal Promoter on the Recrystallized Structure and Optical Transmission of Chemical Vapor Deposited Zinc Sulfide

McCloy

Korenstein

Zelinski

2009

Journal of the American Ceramic Society

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“…It is known that ZnS crystals often form with parallel bands of different polytype structures, the c-axis being perpendicular to the plane of these bands. Datta et al (1977) have studied the CL from striated ZnS crystals and attribute the variations in CL emission to changes in structure, impurity segregation and/or internal electric field effects.…”

Section: Resultsmentioning

confidence: 99%

Cathodoluminescence from ZnS and CdSe

Roberts

Steeds

1980

Scanning

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A scanning electron microscope adapted for optical imaging of the specimen surface was used to study cathodoluminescence (CL) in the visible spectrum. The materials examined were single crystals and evaporated films of both ZnS and CdSe. Single crystals of ZnS were observed to consist of parallel striations giving off CL with a wide variety of colours. Crystals of CdSe gave off a red luminescence which was not uniform but the non‐uniformities could not be correlated with any obvious surface features. The evaporated films of both materials exhibited uniform CL: yellow from ZnS and red from CdSe. When the films were examined on their glass substrates, it was found that the level of CL was sensitive to beam intensity. The effects on CL persisted after reduction of the beam intensity.

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“…Professor David Holt is widely recognized as one of the early pioneers in the development of the cathodoluminescence (CL) and electron beaminduced current (EBIC) modes of the scanning electron microscope (SEM) Datta et al 1977;Davidson et al 1975;Davidson and Rasul 1977;Dimitriadis et al 1978;Holt et al , 1974Holt and Culpan 1970;Steyn et al 1976;Williams and Yoffe 1968;Yacobi et al 1977;Holt 1986, 1990). This work was an inspiration for the development of these modes for the scanning transmission electron microscope (STEM), especially for the present author during his thesis work (Pennycook 1978;Petroff and Lang 1977).…”

Section: Introductionmentioning

confidence: 98%

Investigating the optical properties of dislocations by scanning transmission electron microscopy

Pennycook

2008

Scanning

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The scanning transmission electron microscope (STEM) allows collection of a number of simultaneous signals, such as cathodoluminescence (CL), transmitted electron intensity and spectroscopic information from individual localized defects. This review traces the development of CL and atomic resolution imaging from their early inception through to the possibilities that exist today for achieving a true atomic-scale understanding of the optical properties of individual dislocations cores. This review is dedicated to Professor David Holt, a pioneer in this field.

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Scanning electron microscope studies of local variations in cathodoluminescence in striated ZnS platelets

Cited by 17 publications

References 26 publications

Effects of Temperature, Pressure, and Metal Promoter on the Recrystallized Structure and Optical Transmission of Chemical Vapor Deposited Zinc Sulfide

Effects of Temperature, Pressure, and Metal Promoter on the Recrystallized Structure and Optical Transmission of Chemical Vapor Deposited Zinc Sulfide

Cathodoluminescence from ZnS and CdSe

Investigating the optical properties of dislocations by scanning transmission electron microscopy

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