Динамика фазовых превращений релаксорных сегнетоэлектриков в спектрах комбинационного рассеяния света
Диссертация
Проблема центрального пика достаточно хорошо известна для случаев кристаллических и некристаллических соединений. Общепринятыми в настоящее время являются представления, что в конденсированных средах можно выделить следующие основные механизмы квазиупругого рассеяния света (центрального пика): флуктуации энтропии, флуктуации плотности фононов, передемпфированные мягкие моды, дефекты и примеси… Читать ещё >
Содержание
- Глава I. Результаты исследований спектров комбинационного рассеяния света соединений типа АВ’В"Оз и имеющиеся структурные данные
- 1. 1. Теоретико-групповой анализ спектров комбинационного рассеяния света соединений типа АВ’В"Оз и А’А’ЧВОз
- 1. 2. Исследования колебательных спектров в кристаллах и керамических образцах РЫУ^шМэг/зОз и PbScmTamCh. ifr
- 1. 3. Последовательность фазовых переходов для разупорядоченного и упорядоченного РЬБстТаугОз. iQ
- 1. 4. Структурные данные
- 1. 4. 1. Скандотанталат свинца."
- 1. 4. 2. Магнониобат свинца. f? У
- 1. 5. Проблема центрального пика в колебательных спектрах некристаллических и кристаллических соединений
- Глава II. Исследование центрального пика в спектрах комбинационного рассеяния света кристаллов Р
- 1. /зМЪг/зОз
- 2. 1. Математическая модель обработки низкочастотной части экспериментально полученных спектров Р
- 1. /зМ)2/зОз
- 2. 2. Параметры центрального пика и их температурная зависимость
- 2. 3. Альтернативный способ выделения различных вкладов в спектры комбинационного рассеяния первого порядка
- 2. 4. «Скрытая динамика» кристаллической решетки и подавленный фазовый переход
- 1. /зМЪг/зОз
- 3. 1. Комбинационное рассеяние первого порядка в кристаллах РЬБсшТатОз с различной степенью упорядочения
- 3. 2. Центральный пик в спектрах комбинационного рассеяния в PbSci2Ta, 20,
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