Determination of the Temperature Coefficients of Selected Material Constants of Dilithium Tetraborate

Author

Gregory S. Weaver

Date of Award

6-1995

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering

Department

Department of Electrical and Computer Engineering

First Advisor

Victor M. Bright, PhD

Abstract

The first and second order temperature coefficients of the material constants c^E₁₁, c^E₁₂, c^E₄₄, c^E₆₆, and e¹⁵ of dilithium tetraborate (Li₂B₄O₇) have been measured over a temperature range of 20°C to 150°C. An improved resonator method was used to measure the fundamental zero mass loading antiresonant frequencies of selected pure-mode orientations of Li₂B₄O₇. Material constants extraction was performed using a linear least squares matrix method. The resulting material constant curves were fit with a third order power series to obtain their corresponding temperature coefficients. The calculated temperature coefficients of the material constants c^E₁₁, c^E₁₂, c^E₄₄, c^E₆₆, and e¹⁵ of Li₂B₄O₇ were used to predict the zero mass loading antiresonant c12, c44, c66, and of frequencies of the crystal samples with average errors of 1.20% for thickness excitation and 0.285% for lateral excitation.

AFIT Designator

AFIT-GE-ENG-95J-04

DTIC Accession Number

ADA297542

Comments

The author's Vita page is omitted.

Recommended Citation

Weaver, Gregory S., "Determination of the Temperature Coefficients of Selected Material Constants of Dilithium Tetraborate" (1995). Theses and Dissertations. 6428.
https://scholar.afit.edu/etd/6428