Mechanical and thermophysical properties of 4d-transition metal mononitrides.

The acoustic coupling constant D, is related to the change in elastic modulus caused by strain: HT <math display="block" overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><mi>D</mi><mo>=</mo><mn>9</mn><mfenced close=" " open=" "><msup><mrow><mfenced close=")" open="("><mrow><msubsup><mi> </mi><mi>i</mi><mi>j</mi></msubsup></mrow></mfenced></mrow><mn>2</mn></msup></mfenced><mo>-</mo><mfrac><mrow><mn>3</mn><msup><mrow><mo stretchy="false"> </mo><msubsup><mi> </mi><mi>i</mi><mi>j</mi></msubsup><mo stretchy="false"> </mo></mrow><mn>2</mn></msup><msub><mi>C</mi><mtext>V</mtext></msub><mi>T</mi></mrow><mrow><msub><mi>E</mi><mn>0</mn></msub></mrow></mfrac></math> ht Graph (16)Where HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mfenced close=" " open=" "><mrow><msup><mrow><mfenced close=")" open="("><mrow><msubsup><mi> </mi><mi>i</mi><mi>j</mi></msubsup></mrow></mfenced></mrow><mn>2</mn></msup></mrow></mfenced></mrow></math> ht and HT <math overflow="scroll" xmlns="http://www.w3.org/1998/Math/MathML"><msup><mrow><mrow><mo stretchy="false"> </mo><mrow><msubsup><mi> </mi><mi>i</mi><mi>j</mi></msubsup></mrow><mo stretchy="false"> </mo></mrow></mrow><mn>2</mn></msup></math> ht are square average and average square Grüneisen parameters, respectively. [Extracted from the article]