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Structure-optical property correlation in ferroelectric potassium niobate thin films.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structure-optical property correlation in ferroelectric potassium niobate thin films./
Author:	Gopalan, Venkatraman.
Description:	1 online resource (312 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 57-01, Section: B.
Contained By:	Dissertations Abstracts International57-01B.
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9527417click for full text (PQDT)
ISBN:	9798505539392

Structure-optical property correlation in ferroelectric potassium niobate thin films.
Gopalan, Venkatraman.

Structure-optical property correlation in ferroelectric potassium niobate thin films. - 1 online resource (312 pages)

Source: Dissertations Abstracts International, Volume: 57-01, Section: B.

Thesis (Ph.D.)--Cornell University, 1995.

Includes bibliographical references

The theme of the present work is to develop experimental techniques and theoretical frameworks to extract quantitative structural information from the measurement of optical properties in KNbO_3 thin films. The emphasis is to make these techniques as general as possible so as to be applicable to a variety of crystal structures and material systems. Thin films of KNbO_3 (110) were deposited by laser ablation on MgO(100) and SrTiO_3 (100) substrates. The epitaxial relationships between film and substrate were studied using X-Ray diffraction and Transmission Electron Microscopy. Capacitance measurements, high temperature X-Ray and Second Harmonic Generation were used to study phase transition in the films. A model was developed that correlates the refractive index measurements in different direction in the film to the area fraction of these domains in its growth plane. Using the indices measured by prism coupling technique, the model correctly predicts the absence of KNbO_3 (001) orientation in the film. The other two KNbO_3 (110) variants were calculated to be 50 +/- 8%. The Second Harmonic Generation (SHG) from our films was measured for an incident fundamental beam of 1064 nm. Theoretical model was developed that correlates the SHG output from the film to the relative area fraction of domains variants. From the fitting parameters, ratios of non-linear coefficients and relative area fraction of different domain variants can be determined. This technique can distinguish domains across 60^circ, 120^circ, 180^circ and any charged 90^circ KNbO_3 domain walls. In-Situ Second Harmonic Generation studies were conducted to study the domain reorientation process in the film under external electric field. The behaviour of SHG intensity as a function of field polarity and magnitude reveal the direction and relative magnitudes of net poling bias in the film along KNbO_3 pseudo-cubic <100> directions. Comparison of poling behaviour of film on different substrates reveal evidence for domain wall pinning by low angle grain boundaries. Mechanisms for domain pinning by these boundaries have been proposed.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798505539392Subjects--Topical Terms:

543314
Materials science.
Index Terms--Genre/Form:

542853
Electronic books.

Structure-optical property correlation in ferroelectric potassium niobate thin films.
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100 1 $a Gopalan, Venkatraman. $3 3700602
245 1 0 $a Structure-optical property correlation in ferroelectric potassium niobate thin films.
264 0 $c 1995
300 $a 1 online resource (312 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 57-01, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--Cornell University, 1995.
504 $a Includes bibliographical references
520 $a The theme of the present work is to develop experimental techniques and theoretical frameworks to extract quantitative structural information from the measurement of optical properties in KNbO_3 thin films. The emphasis is to make these techniques as general as possible so as to be applicable to a variety of crystal structures and material systems. Thin films of KNbO_3 (110) were deposited by laser ablation on MgO(100) and SrTiO_3 (100) substrates. The epitaxial relationships between film and substrate were studied using X-Ray diffraction and Transmission Electron Microscopy. Capacitance measurements, high temperature X-Ray and Second Harmonic Generation were used to study phase transition in the films. A model was developed that correlates the refractive index measurements in different direction in the film to the area fraction of these domains in its growth plane. Using the indices measured by prism coupling technique, the model correctly predicts the absence of KNbO_3 (001) orientation in the film. The other two KNbO_3 (110) variants were calculated to be 50 +/- 8%. The Second Harmonic Generation (SHG) from our films was measured for an incident fundamental beam of 1064 nm. Theoretical model was developed that correlates the SHG output from the film to the relative area fraction of domains variants. From the fitting parameters, ratios of non-linear coefficients and relative area fraction of different domain variants can be determined. This technique can distinguish domains across 60^circ, 120^circ, 180^circ and any charged 90^circ KNbO_3 domain walls. In-Situ Second Harmonic Generation studies were conducted to study the domain reorientation process in the film under external electric field. The behaviour of SHG intensity as a function of field polarity and magnitude reveal the direction and relative magnitudes of net poling bias in the film along KNbO_3 pseudo-cubic <100> directions. Comparison of poling behaviour of film on different substrates reveal evidence for domain wall pinning by low angle grain boundaries. Mechanisms for domain pinning by these boundaries have been proposed.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 543314
650 4 $a Condensation. $3 942542
650 4 $a Condensed matter physics. $3 3173567
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0794
690 $a 0611
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Cornell University. $3 530586
773 0 $t Dissertations Abstracts International $g 57-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9527417 $z click for full text (PQDT)