1998
DOI: 10.1016/s0040-6090(97)00698-6
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On the effects of stresses in ferroelectric (Pb,Ca)Tio3 thin films

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Cited by 67 publications
(36 citation statements)
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“…1,2 In recent years there is an increasing interest in lead titanate, PbTiO 3 , with compositional modifications at Pb and Ti sites by Ca, Sr, La, and Zr, respectively, due to their potential applications, such as infrared sensors, electro-optic devices, ferroelectric memories and so on. [3][4][5] Among these materials, ͑Pb,Ca͒TiO 3 ͑PCT͒ has recently attracted much attention for use in pyroelectric devices and ferroelectric memories, particularly as nonvolatile ferroelectric random access memories ͑NVFRAMs͒ due to the promise of high speed, radiation hardness, high remanent polarization, high dielectric constant, and low power consumption. Substitution of Pb for Ca, will introduce a shrinkage of the lattice in the c-axis direction of the tetragonal phase in the perovskite structure of PbTiO 3 .…”
Section: Introductionmentioning
confidence: 99%
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“…1,2 In recent years there is an increasing interest in lead titanate, PbTiO 3 , with compositional modifications at Pb and Ti sites by Ca, Sr, La, and Zr, respectively, due to their potential applications, such as infrared sensors, electro-optic devices, ferroelectric memories and so on. [3][4][5] Among these materials, ͑Pb,Ca͒TiO 3 ͑PCT͒ has recently attracted much attention for use in pyroelectric devices and ferroelectric memories, particularly as nonvolatile ferroelectric random access memories ͑NVFRAMs͒ due to the promise of high speed, radiation hardness, high remanent polarization, high dielectric constant, and low power consumption. Substitution of Pb for Ca, will introduce a shrinkage of the lattice in the c-axis direction of the tetragonal phase in the perovskite structure of PbTiO 3 .…”
Section: Introductionmentioning
confidence: 99%
“…[3][4][5] Among these materials, ͑Pb,Ca͒TiO 3 ͑PCT͒ has recently attracted much attention for use in pyroelectric devices and ferroelectric memories, particularly as nonvolatile ferroelectric random access memories ͑NVFRAMs͒ due to the promise of high speed, radiation hardness, high remanent polarization, high dielectric constant, and low power consumption. Substitution of Pb for Ca, will introduce a shrinkage of the lattice in the c-axis direction of the tetragonal phase in the perovskite structure of PbTiO 3 . Pure PbTiO 3 has a large tetragonal distortion at room temperature, c/aϳ1.064, which will introduce a stress in the material upon the cooling through the phase transition, producing cracking in the material.…”
Section: Introductionmentioning
confidence: 99%
“…La temperatura de transici-n T C en el caso de la l ‡mina C es ligeramente menor a la medida para l ‡minas de un solo dep-sito y espesor similar (12). En el caso de las l ‡minas sobre substratos A y B se aprecia un descenso en la temperatura lo que pudiera estar ligado a una menor tensi-n en la l ‡mina (15). Este descenso en la tensi-n puede ser debido al proceso de fabricaci-n en multicapas y a la orientaci-n preferente generada en las mismas.…”
Section: Resultados Y Discusiînunclassified
“…Entre las causas más importantes caben citar la naturaleza de la intercara substrato-lámina, y la generación de tensiones mecánicas durante el proceso de formación de la lámina, especialmente en el caso de los métodos químicos de preparación (ver citas en [5]). En la Figura 5 se muestra el efecto sobre la temperatura de transición, de las tensiones generadas en dos láminas de igual composición pero con tensiones mecánicas distintas debido al proceso de formación [18]. Se comparan las curvas de permitividad con temperatura frente a la de un material cerámico de la misma composición.…”
Section: Láminas Delgadasunclassified
“…Mediante medidas de perfilometria y espectroscopia Raman se ha visto que las mencionadas láminas sufren durante la etapa de secado un fuerte encogimiento que causa una considerable tensión por tracción [18]. La posterior etapa de cristalización aumenta esta tensión debido al nuevo encogimiento de la lámina, a la dilatación térmica durante el paso de la transición para-ferroeléctrica y a las diferencias de los coeficientes de dilatación térmica, del substrato y de la lámina.…”
Section: Láminas Delgadasunclassified